Measuring conducted emission is the simplest and most affordable method of getting some indication of whether a design can meet EMI/EMC requirements. A Line Impedance Stabilization Network (LISN) is an indispensable part of an EMC pre-compliance test setup.
In cooperation with Würth Elektronik, Elektor has developed a 5 µH, 50 Ω Dual DC LISN that supports voltages up to 60 V and currents up to 10 A.
The instrument measures RF interferences on both channels (the power supply) by means of 5-μH blocking inductances. The internal 10-dB attenuation network – one in each channel – contains a 3rd-order high-pass filter with a cutoff frequency of 9 kHz to protect the input of instruments like a spectrum analyzer from potentially harmful DC voltages or low frequencies coming from the EUT (Equipment Under Test).
Specifications
RF path
Channels
2 (with clamping diodes)
Bandwidth
150 kHz – 200 MHz
Inductance
5 μH || 50 Ω
Internal attenuation
10 dB
Connectors
SMA
DC path
Max. current
< 10 ADC
Max. voltage
< 60 VDC
DC resistance
< 2 x 70 mΩ
PCB size
94.2 x 57.4 mm
Connectors
4-mm banana
Hammond enclosure
Type
1590N
Dimensions
121 x 66 x 40 mm
Included
1x 4-layer PCB with all SMT parts fitted
1x pre-drilled enclosure with ready-printed front panel layout
5x gold-plated, insulated, 4-mm banana sockets, rated for 24 A, 1 kV
1x Hammond enclosure 1590N1, Aluminum (Die-Cast Alloy)
More Info
Project on Elektor Labs: Dual DC LISN for EMC pre-compliance testing
Elektor 9-10/2021: EMC Pre-Compliance Test for Your DC-Powered Project (Part 1)
Elektor 11-12/2021: EMC Pre-Compliance Test for Your DC-Powered Project (Part 2)
The Elektor MultiCalculator Kit is an Arduino-based multifunction calculator that goes beyond basic calculations. It offers 22 functions including light and temperature measurement, differential temperature analysis, and NEC IR remote control decoding. The Elektor MultiCalculator is a handy tool for use in your projects or for educational purposes.
The kit features a Pro Mini module as the computing unit. The PCB is easy to assemble using through-hole components. The enclosure consists of 11 acrylic panels and mounting materials for easy assembly. Additionally, the device is equipped with a 16x2 alphanumeric LCD, 20 buttons, and temperature sensors.
The Elektor MultiCalculator is programmable with the Arduino IDE through a 6-way PCB header. The available software is bilingual (English and Dutch). The calculator can be programmed with a programming adapter, and it is powered through USB-C.
Modes of Operation
Calculator
4-Ring Resistor Code
5-Ring Resistor Code
Decimal to Hexadecimal and Character (ASCII) conversion
Hexadecimal to Decimal and Character (ASCII) conversion
Decimal to Binary and Character (ASCII) conversion
Binary to Decimal and Hexadecimal conversion
Hz, nF, capacitive reactance (XC) calculation
Hz, µH, inductive reactance (XL) calculation
Resistance calculation of two resistors connected in parallel
Resistance calculation of two resistors connected in series
Calculation of unknown parallel resistor
Temperature measurement
Differential temperature measurement T1&T2 and Delta (δ)
Light measurement
Stopwatch with lap time function
Item counter
NEC IR remote control decoding
AWG conversion (American Wire Gauge)
Rolling Dice
Personalize startup message
Temperature calibration
Specifications
Menu languages: English, Dutch
Dimensions: 92 x 138 x 40 mm
Build time: approx. 5 hours
Included
PCB and though-hole components
Precut acrylic sheets with all mechanical parts
Pro Mini microcontroller module (ATmega328/5 V/16 MHz)
Programming adapter
Waterproof temperature sensors
USB-C cable
Downloads
Software
What kind of device is this? And what can you do with it? Well, this device doesn't need much explanation.
The most useless device in the world!
The Useless Box literally serves no purpose, but at the same time it's so hilarious that you'll want to show it to everyone. With this kit you have the opportunity to build your own Useless Box and expand your technical knowledge. Ultimately, this device switches off every time it is switched on and therefore performs a completely pointless function.
Still curious? Then watch the video below. A must-have for every office: at home or at work!
This DIY kit (HU-017A) is a wireless FM radio receiver with a 4-digit 7-segment display. It operates within the global FM receiving frequency band of 87.0-108.0 MHz, making it suitable for use in any country or region. The kit offers two power supply modes, allowing you to use it both at home and outdoors. This DIY electronic product will help you understand circuits and improve your soldering skills.
Features
87.0-108.0 MHz FM Radio: Built-in RDA5807 FM data processor with a standard FM receiving frequency band. The FM frequency can be adjusted using the F+ and F- buttons.
Adjustable Volume: Two volume adjustment methods – button and potentiometer. There are 15 volume levels.
Active & Passive Audio Output: The kit has a built-in 0.5 W power amplifier to drive 8 Ω speakers directly. It also outputs audio signals to headsets or loudspeakers with AUX interfaces, allowing personal listening and sharing of FM audio.
Configured with a 25 cm dedicated FM antenna and a (red) 4-digit 7-segment display for real-time display of FM radio frequency. The transparent acrylic shell protects the internal circuit board. It supports dual power supply methods – 5 V USB and 2x 1.5 V (AA) batteries.
DIY Hand Soldering: The kit comes with various components that need to be installed manually. It helps exercise and improve soldering skills, making it suitable for electronics hobbyists, beginners, and educational purposes.
Specifications
Operating voltage
DC 3 V/5 V
Output impedance
8 Ω
Output power
0.5 W
Output channel
Mono
Receiver frequency
87.0 MHz~108.0 MHz
Frequency accuracy
0.1 MHz
Operating temperature
−40°C to +85°C
Operating humidity
5% to 95% RH
Dimensions
107 x 70 x 23 mm
IMPORTANT: Remove the batteries when powering the radio over to USB.
Included
1x PCB
1x RDA5807M FM Receiver
1x STC15W404AS MCU
1x IC Socket
1x 74HC595D Register
1x TDA2822M Amplifier
1x IC Socket
1x AMS1117-3.3 V Voltage Converter
18x Metal Film Resistor
1x Potentiometer
4x Ceramic Capacitor
5x Electrolytic Capacitor
4x S8550 Transistor
1x Red LED
1x 4-digit 7-segment Display
1x Toggle Switch
1x SMD Micro USB Socket
1x Radio Antenna
1x AUX Audio Socket
4x Black Button
4x Button Cap
1x 0.5 W/8 Ω Speaker
1x Red/Black Wire
2x Double-sided adhesive
1x AA Battery Box
1x USB cable
6x Acrylic Board
4x Nylon Column Screw
4x M3 Screw
4x M3 Nut
4x M2x22 mm Screw
1x M2x6 mm Screw
5x M2 Nut
This LC meter kit is an easy-to-build, educational, and entertaining DIY project for measuring the inductance (L) of coils and inductors, the capacitance (C) of capacitors, other passive components and the frequency of signals.
Specifications
Power supply
USB DC 5 V
Capacitance measurement range of small non-polarized capacitors
1 pF~2200 pF
Capacitance measurement range of electrolytic capacitors
1 µF~12000 µF
Inductance measurement range
1 µH~1 H
Frequency measurement range
20 Hz~400 kHz
Dimensions (PCB)
91 x 80 mm
Dimensions (Shell)
106 x 91 x 28 mm
Included
Doubled-sided PCB
All required components incl. LCD display
Six pre-cut transparent acrylic plates
Screws and nuts
Raspberry Pi-based Eye Catcher
A standard sand clock just shows how time passes. In contrast, this Raspberry Pi Pico-controlled sand clock shows the exact time by “engraving” the four digits for hour and minute into the layer of sand. After an adjustable time the sand is flattened out by two vibration motors and everything begins all over again.
At the heart of the sand clock are two servo motors driving a writing pen through a pantograph mechanism. A third servo motor lifts the pen up and down. The sand container is equipped with two vibration motors to flatten the sand. The electronic part of the sand clock consists of a Raspberry Pi Pico and an RTC/driver board with a real-time clock, plus driver circuits for the servo motors.
A detailed construction manual is available for downloading.
Features
Dimensions: 135 x 110 x 80 mm
Build time: approx. 1.5 to 2 hours
Included
3x Precut acrylic sheets with all mechanical parts
3x Mini servo motors
2x Vibration motors
1x Raspberry Pi Pico
1x RTC/driver board with assembled parts
Nuts, bolts, spacers, and wires for the assembly
Fine-grained white sand
This DIY LiPo Supercharger/Booster (developed the electronics engineer/YouTuber GreatScott! and produced by Elektor) can charge a single-cell LiPo battery and protect it against the effects of overvoltage, overload, and short-circuits. Additionally, it can boost the battery voltage to 5 V or 12 V. The boosted output voltage is protected by an ‘eFuse’ IC outputting 1.52 A at 5 V or 0.76 A at 12 V maximum.
The charger part of the circuit needs a +5 V power supply which can be connected through USB-C, or simply two wires soldered to pads on the PCB.
In addition, other connections can be soldered to pads on the PCB or by using single pinheaders.
Included
1x Mainboard pre-assembled with the 4 ICs
15x Resistors
3x LEDs
13x Capacitors
2x Switches
1x USB-C on a breakout board
2x Diodes
Please note: Battery is not included.
The board uses a DC/DC Converter, an IC charger, and an e Fuse from Texas Instruments. The battery protection IC is from Xysemi and provides under-voltage lockout, over current protection, and reverse battery protection.
The board is connected to the power and recharges the batteries via a USB-C connection.
Specifications
Battery
Single-cell lithium-ion or lithium-polymer battery
Input Voltage
+5 V / 2 A max.
Output Voltage
5 V / 1.52 A12 V / 0.76 A
LiPo Protection
XB8089D
Overcharge Detection
4.250 V
Overcharge Release
4.10 V
Overdischarge Detection
2.50 V
Overdischarge Release
3 V
Overcurrent Detection
10.0 A
Thermal Shutdown
Auto-retry
Enable/Undervoltage Lockout
Rising: 1.2 V (typ.)Falling: 1.1 V (typ.)
The project book, written by well-known Elektor author Dogan Ibrahim, holds many software- and hardware-based projects especially developed for the Arduino Uno Experimenting Kit. The kit comes with an Arduino Uno board, several LEDs, sensors, actuators, and other components. The purpose of the kit is to make a flying start with hardware and software aspects of projects designed around the Arduino Uno microcontroller system. The projects given in this guide are fully evaluated and working and fully employ all the supplied components. A block diagram, a circuit diagram, an extensive program listing, and a complete program description is given for every project in the guide. Included in the kit 1x Arduino Uno Rev3 board
1x RFID reader module 1x DS1302 clock module 1x 5 V stepper motor 1x '2003' stepper motor drive board 5x Green LED 5x Yellow LED 5x Red LED 2x Rocker switch 1x Flame sensor 1x LM35 sensor module 1x Infrared receiver 3x Light-dependent resistors (LDRs) 1x IR remote controller 1x Breadboard 4x Pushbutton (with four caps) 1x Buzzer 1x Piezo sounder 1x Adjustable resistor (potentiometer) 1x 74HC595 shift register 1x 7-segment display 1x 4-digit 7-segment display 1x 8x8 Dot-matrix display 1x 1602 / I²C LCD module 1x DHT11 Temperature and humidity module 1x Relay module 1x Sound module Set of Dupont cables Set of Breadboard cables 1x Water sensor 1x PS2 Joystick 5x 1 k-ohm resistor 5x 10 k-ohm resistor 5x 220-ohm resistor 1x 4x4 keypad module 1x 9g Servo (25 cm) 1x RFID card 1x RGB module 1x 9 V battery DC jack Project book (237 pages) Over 60 Projects in the Book Hardware Projects with LEDs Blinking LED – using the onboard LED Blinking LED – using an external LED LED flashing SOS Alternately-blinking LEDs Chasing LEDs Chasing LEDs 2 Binary counting LEDs Random flashing LEDs – Christmas lights Button controlled LED Controlling the LED flashing rate – external interrupts Reaction timer LED color wand RGB fixed colors Traffic lights Traffic lights with pedestrian crossings Using the 74HC595 shift register – binary up counter Using the 74HC595 shift register – randomly flashing 8 LEDs Using the 74HC595 shift register – chasing LEDs Using the 74HC595 shift register – turn ON a specified LED Using the 74HC595 shift register – turn ON specified LEDs 7-Segment LED Displays 7-Segment 1-digit LED counter 7-Segment 4-digit multiplexed LED display 7-Segment 4-digit multiplexed LED display counter – timer interrupts 7-Segment 4-digit multiplexed LED display counter – eliminating the leading zeroes 7-Segment 4-digit multiplexed LED display – reaction timer Timer interrupt blinking onboard LED Liquid Crystal Displays (LCDs) Display text on the LCD Scrolling text on the LCD Display custom characters on the LCD LCD based conveyor belt goods counter LCD-based accurate clock using timer interrupts LCD dice Sensors Analog temperature sensor Voltmeter On/Off temperature controller Darkness reminder using a light-dependent resistor (LDR) Tilt detection Water-level sensor Displaying water levels Water level controller Flooding detector with buzzer Sound detection sensor – relay control by hand clapping Flame sensor – fire detection with relay output Temperature and humidity display Generating musical tones with the melody maker The RFID Reader Finding the Tag ID RFID door lock access control with relay The 4x4 Keypad Display the pressed key code on the Serial Monitor Integer calculator with LCD Keypad door security lock with relay The Real-Time Clock (RTC) Module RTC with Serial Monitor RTC with LCD Temperature and humidity display with time stamping The Joystick Reading joystick analog values 8x8 LED Matrix Displaying shapes Motors Test-rotate the servo Servo sweep Joystick-controlled servo Rotate the motor clockwise and then anticlockwise Infrared Receiver and Remote Controller Unit Decoding the IR remote control codes Remote relay activation/deactivation Infrared remote stepper motor control
The Elektor Audio DSP FX Processor combines an ESP32 microcontroller and an ADAU1701 Audio DSP from Analog Devices. Besides a user-programmable DSP core, the ADAU1701 has high-quality analog-to-digital and digital-to-analog converters built-in and features an I²S port. This makes it suitable as a high-quality audio interface for the ESP32.
Programs for the ESP32 can be created with Arduino, Platform IO, CMake or by using the Espressif IDF in another way. Programs for the ADAU7101 audio DSPs are created with the free visual programming tool SigmaStudio by dragging and dropping pre-defined algorithm blocks on a canvas.
Applications
Bluetooth/Wi-Fi audio sink (e.g. loudspeaker) & source
Guitar effect pedal (stomp box)
Music synthesizer
Sound/function generator
Programmable cross-over filter for loudspeakers
Advanced audio effects processor (reverb, chorus, pitch shifting, etc.)
Internet-connected audio device
DSP experimentation platform
Wireless MIDI
MIDI to CV converter
and many more...
Specifications
ADAU1701 28-/56-bit, 50-MIPS digital audio processor supporting sampling rates of up to 192 kHz
ESP32 32-bit dual-core microcontroller with Wi-Fi 802.11b/g/n and Bluetooth 4.2 BR/EDR and BLE
2x 24-bit audio inputs (2 V RMS, 20 kΩ)
4x 24-bit audio outputs (0.9 V RMS, 600 Ω)
4x Control potentiometer
MIDI in- and output
I²C expansion port
Multi-mode operation
Power supply: 5 V DC USB or 7.5-12 V DC (barrel jack, center pin is GND)
Current consumption (average): 200 mA
Included
1x ESP32 Audio DSP FX Processor board (assembled)
1x ESP32-PICO-KIT
2x Jumpers
2x 18-pin headers (female)
4x 10 KB potentiometers
Downloads
Documentation
GitHub
This comprehensive starter kit contains a wide range of important electronic components. From resistors and capacitors to LEDs, switches, buzzers and a breadboard with jumper wires – this kit contains everything you need to get started with your electronics projects.
Contents
1x High Quality Retail Box
10x 1/4W 1% 100R Resistor
10x 1/4W 1% 220R Resistor
10x 1/4W 1% 330R Resistor
10x 1/4W 1% 1K Resistor
10x 1/4W 1% 10K Resistor
10x 1/4W 1% 100K Resistor
10x 1/4W 1% 4.7K Resistor
10x 1/4W 1% 47K Resistor
10x 100PF Ceramic Capacitor
10x 10NF Ceramic Capacitor
10x 100NF Ceramic Capacitor
10x 22PF Ceramic Capacitor
10x 10UF aluminum electrolytic capacitor
10x 470UF aluminum electrolytic capacitor
10x Red LED
10x Green LED
10x Yellow LED
10x Blue LED
8x 12x12x7.3 Switch
2x Red Cap
2x Yellow Cap
2x Green Cap
2x Blue Cap
1x 10K Precision Potentiometer
2x RGB LED
1x Active Buzzer
1x Passive Buzzer
1x Pin Header 1x40
1x Resistor Card
1x 400pts Breadboard
1x 30pcs/pack Breadboard Jumper Wires Set
Arduino-compatible, ESP32-controlled, 2-wheeled Balancing Robot
The Elektor Mini-Wheelie is an experimental autonomous self-balancing robot platform. Based on an ESP32-S3 microcontroller, the self-balancing robot is fully programmable using the Arduino environment and open-source libraries. Its wireless capabilities allow it to be controlled remotely over Wi-Fi, Bluetooth or ESP-NOW or to communicate with a user or even another robot.
An ultrasonic transducer is available for detecting obstacles. Its color display can be used for displaying cute facial expressions or, for the more down-to-earth users, cryptic debug messages.
The robot comes as a neat kit of parts that you must assemble yourself. Everything is included, even a screwdriver.
Note: The Mini-Wheelie is an educational development platform intended for learning, experimentation, and robotics development. It is not classified as a toy for children, and its features, documentation, and intended audience reflect this purpose. The product is aimed at students, educators, and developers who wish to explore robotics, programming, and hardware integration in an educational setting.
Specifications
ESP32-S3 microcontroller with Wi-Fi and Bluetooth
MPU6050 6-axis Inertial Measurement Unit (IMU)
Two independently controlled 12 V electric motors with tachometer
Ultrasonic transducer
2.9" TFT color display (320 x 240)
MicroSD card slot
Battery power monitor
3S rechargeable Li-Po battery (11.1 V/2200 mAh)
Battery charger included
Arduino-based open-source software
Dimensions (W x L x H): 23 x 8 x 13 cm
Included
1x ESP32-S3 Mainboard + MPU6050 module
1x LCD board (2.9 inch)
1x Ultrasonic sensor
1x Battery pack (2200 mAh)
1x Battery charger
1x Motor tyre kit
1x Case board
1x Acrylic board
1x Screwdriver
1x Protective strip
1x Flex cable B (8 cm)
1x Flex cable A (12 cm)
1x Flex cable C
4x Copper column A (25 mm)
4x Copper column B (55 mm)
4x Copper column C (5 mm)
2x Plastic nylon column
8x Screws A (10 mm)
24x Screws B (M3x5)
8x Nuts
24x Metal washers
2x Zip tie
1x MicroSD card (32 GB)
Downloads
Documentation
This hot-air single-cylinder Stirling engine generator converts thermal energy into mechanical energy. This kit comes with a little electricity generator that can power a USB reading light.
The Stirling engine comes as an easy-to-build kit with all the parts and tools included, and a printed sheet with instructions and explanations. Building the kit takes about 15 minutes. The assembled motor measures 16 x 8 cm and is 10.5 cm high. It weighs 380 grams.
Turn the flywheel by hand to ensure it moves smoothly.
Check that the sliding parts are clean.
Fill the alcohol lamp to less than two-thirds full with 95% or higher concentration alcohol.
Light the alcohol lamp at the front end of the test tube.
After about 1 minute, turn the flywheel.
The engine should start spinning. Note that the warm-up time is slightly longer when using the generator.
Ocean Sound Generator
The Elektor Surf Synthesizer convincingly imitates the sound of breaking waves. It is based on a circuit published in the 1972 summer edition of Elektor to celebrate the Summer Olympics held that year in Munich, Germany. The Surf Synthesizer can be considered a real analog music synthesizer, as it follows the paradigm of voltage-controlled subtractive sound synthesis made popular by Robert Moog and friends (remember the Elektor Formant?). Instead of a VCO (voltage-controlled oscillator), it has a noise generator as a sound source. A VCF (voltage-controlled filter) and a VCA (voltage-controlled amplifier) modulated by three LFOs (low-frequency oscillators) shape the sound of the waves.
The Surf Synthesizer comes as an easy-to-build kit using only through-hole components. The kit contains all the required parts, including a stylish wooden stand. First mount all the parts on the front side (showing the schematic). Terminate by mounting the battery holder on the backside (showing the circuit description).
The use of headphones (not included) is recommended for obtaining the best sound quality.
A 9 V (PP3) battery (not included) powers the Surf Synthesizer.
Component List
Resistors (5%, 0.25 W)
R30 = 100 Ω
R1 = 470 Ω
R39 = 560 Ω
R36 = 680 Ω
R26 = 1 kΩ
R35 = 2.2 kΩ
R18 = 4.7 kΩ
R2, R5, R6, R9, R10, R13 = 6.8 kΩ
R16, R37, R38 = 10 kΩ
R14, R24 = 22 kΩ
R15 = 33 kΩ
R7, R20 = 39 kΩ
R11, R19, R21, R28 = 47 kΩ
R4, R12, R17, R23, R25, R31, R32, R33, R34 = 68 kΩ
R22 = 100 kΩ
R8 = 180 kΩ
R3 = 270 kΩ
R29 = 680 kΩ
R27 = 1 MΩ
P1, P2 = 50 kΩ trimmer
Capacitors
C13 = 4.7 nF
C11 = 47 nF
C12 = 100 nF
C10 = 220 nF
C9, C14, C15, C17, C19 = 10 µF, 16 V, 2 mm pitch
C2, C3, C4, C5, C6, C7 = 47 µF, 16 V, 2 mm pitch
C1, C8, C16, C18 = 100 µF, 16 V, 2.5 mm pitch
Semiconductors
D1, D2 = 1N4148
D3 = BAT48
T1, T2, T3, T4, T5, T6, T7, T8, T9, T10 = BC547C
Divers
BAT1 = PP3 9 V battery holder (battery not included)
K1 = speaker 8 Ω, 200 mW
S1 = slide switch
Elektor PCB 240095-1
Wooden stand
Specifications
Power
9 V, 100 mW
Dimensions
170 x 140 x 70 mm
Weight
250 g
The Elektor ESP32 Energy Meter is a device designed for real-time energy monitoring and smart home integration. Powered by the ESP32-S3 microcontroller, it offers robust performance with modular and scalable features.
The device uses a 220 V-to-12 V step-down transformer for voltage sampling, ensuring galvanic isolation and safety. Its compact PCB layout includes screw-type terminal blocks for secure connections, a Qwiic connector for additional sensors, and a programming header for direct ESP32-S3 configuration. The energy meter is compatible with single-phase and three-phase systems, making it adaptable for various applications.
The energy meter is simple to set up and integrates with Home Assistant, offering real-time monitoring, historical analytics, and automation capabilities. It provides accurate measurements of voltage, current, and power, making it a valuable tool for energy management in homes and businesses.
Features
Comprehensive Energy Monitoring: Get detailed insights into your energy usage for smarter management and cost savings.
Customizable Software: Tailor functionality to your needs by programming and integrating custom sensors.
Smart Home Ready: Compatible with ESPHome, Home Assistant, and MQTT for full Smart Home integration.
Safe & Flexible Design: Operates with a 220 V-to-12 V step-down transformer and features a pre-assembled SMD board.
Quick Start: Includes one Current Transformer (CT) sensor and access to free setup resources.
Specifications
Microcontroller
ESP32-S3-WROOM-1-N8R2
Energy Metering IC
ATM90E32AS
Status Indicators
4x LEDs for power consumption indication2x Programmable LEDs for custom status notifications
User Input
2x Push buttons for user control
Display Output
I²C OLED display for real-time power consumption visualization
Input Voltage
110/220 V AC (via step-down transformer)
Input Power
12 V (via step-down transformer or DC input)
Clamp Current Sensor
YHDC SCT013-000 (100 A/50 mA) included
Smart Home Integration
ESPHome, Home Assistant, and MQTT for seamless connectivity
Connectivity
Header for programming, Qwiic for sensor expansion
Applications
Supports single-phase and three-phase energy monitoring systems
Dimensions
79.5 x 79.5 mm
Included
1x Partly assembled board (SMDs are pre-mounted)
2x Screw terminal block connerctors (not mounted)
1x YHDC SCT013-000 current transformer
Required
Power transformer not included
Downloads
Datasheet (ESP32-S3-WROOM-1)
Datasheet (ATM90E32AS)
Datasheet (SCT013-000)
Frequently Asked Questions (FAQ)
From Prototype to Finished Product
What started as an innovative project to create a reliable and user-friendly energy meter using the ESP32-S3 microcontroller has evolved into a robust product. Initially developed as an open-source project, the ESP32 Energy Meter aimed to provide precise energy monitoring, smart home integration and more. Through meticulous hardware and firmware development, the energy meter now stands as a compact, versatile solution for energy management.
The TV-B-Gone universal remote control allows you to turn virtually any TV On or OFF. You control when you see TV, rather than what you see. The TV-B-Gone Keychain remote is so small that it easily fits in your pocket so that you have it handy whenever you need it, wherever you go: bars, restaurants, laundromats, ballparks, arenas, etc.The TV-B-Gone Kit is a great way to teach about electronics. When soldered together, it allows you to turn off almost any television within 150 feet or more. It works on over 230 total power codes – 115 American/Asian and another 115 European codes. You can select which zone you want during kit assembly.This is an unassembled kit which means that soldering and assembly is required – but it’s very easy and a great introduction to soldering in general.This kit makes the popular TV-B-Gone remote more fun because you created it yourself with some basic soldering and assembly! Show your friends and family how technologically savvy you are, and entertain them with the power of the TV-B-Gone!The kit is powered by 2x AA batteries and the output comes from 2x narrow beam IR LEDs and 2x wide-beam IR LEDs.IncludedAll required parts/componentsRequiredTools, soldering iron, and batteriesDownloadsGitHub
The Elektor Quasi-Analog Clockwork (Dimensions: 160 x 245 mm) is a digital clock with an analog look and feel.
The clock consists of 144 3-mm LEDs in a circle, indicating 12 hours with a 5-minute resolution. 11 standard logic ICs are used. All components in the kit are through hole.
The circuit uses standard HC-logic and still one 4000-logic IC (CD4060), a 32.768 kHz quarts reference clock and a 5 V power supply. Any small 5 VDC adapter (not included) can be connected via a small screw-terminal block on the board.
The quasi-analogue clockwork uses 144 LEDs (light emitting diodes) to indicate the time on a round, quasi-analogue dial with a diameter of about 143 mm. One of twelve green LEDs lights at maximum intensity to mark the hours, while the other eleven are dimmed. Between two green LEDs sit 11 red LEDs, each of which represents a period of five minutes. In this way, the time is indicated with an accuracy of five minutes. This would seem to be enough in view of the mostly decorative function of the present clockwork.
Construction of the clock is fairly easy as all components are through hole. A detailed description of how to build the Quasi-Analog Clockwork can be found in the manual of this kit. It can be downloaded here. Please read the manual before heating up the soldering iron!
Specifications
Time display
12 hours in a circle
Display
144 LEDs
LED circle
132 red LEDs, 12 green LEDs
Resolution display
5 minutes
Seconds indication
1 LED in center of circle, blinking at 0.5 Hz
Technology
10 HC-logic series IC’s, 1x 4000-logic series IC
Reference signal
32 kHz quartz oscillator (adjustable)
Set clock
1 push button, 5 minutes step
Power supply
5 V (Power Supply not included)
Dimensions
160 x 245 mm
Included
Elektor PCB 240118-1
All Components
Wooden Stand
Bill of Materials
Resistors
R1, R22, R24 = 2.2 kΩ
R2 = 390 kΩ
R3, R5, R6, R7 = 82 kΩ
R4 = 1 kΩ
R8-R19 = 8.2 kΩ
R20 = 20 MΩ
R21 = 330 kΩ
R23 = 560 Ω
R25 = 470 Ω
R26 = 100 kΩ
Capacitors
C1-C4, C8-C18 = 100 nF, 50 V
C5 =22 pF, 50 V
C6 = 10 pF, 50 V
C7 = 3-10 pF trimmer
Semiconductors
D1, D13, D25, D37, D49, D61, D73. D85, D97, D109, D121, D133 = LED, green, 3 mm
D2-D12, D14-D24, D26-D36, D38-D48, D50-D60, D62-D72, D74-D84, D86-D96, D98-D108, D110-D120, D122-D132, D134-D144, D162-D163 = LED, red, 3 mm
D145-D156 = 1N4148 DO-35
D164 = 1N4001 DO-41
T1, T2 = BC547B
IC1 = CD4060, DIP-16
IC2 = 74HC21, DIP-14
IC3, IC4 = 74HC132, DIP-14
IC5, IC6 = 74HC4024, DIP-14
IC7, IC8, IC9, IC10 = 74HC4051, DIP-16
IC11 = 7
Miscellaneous
K1 = 2-way PCB terminal block, 3.5 mm grid
S1 = 6 mm tactile pushbutton
X1 = 32.768 kHz crystal
An alternative power supply for the Elektor Fortissimo-100 Power Amplifier
For those who object to a switch-mode power supply for the Fortissimo-100 Power Amplifier, this kit yields a linear, symmetrical, voltage regulator marked by low dropout voltage, high output current, and excellent stability – all obtained from discrete components.
Bearing in mind that nearly all high-performance audio power amplifiers benefit from a stabilized power supply, this linear power supply is specifically designed for a symmetrical output voltage of ±40 V and peak currents of 13 A (15 A peak achievable). As an example, the average current drawn by a Fortissmo-100 amp driving a 3 Ω load is 4 A per regulator.
Specifications
Input voltage range
52 V DC (low power usage) to 43 V DC
Output voltage range
approx. 38.9 V DC to 41.4 V DC (theoretically)38.6 V DC to 41.1 V DC (measured)
Dropout voltage at 6 A
42 V
Dropout voltage at 9.5 A
43 V
Dropout voltage at 13.5 A
44 V
Max. current
15 A peak (half sinewave), 4.8 A (average)
SOAR protection
15 A at 45 V DC in
Ripple rejection
>60 dB (@ 5 A DC load)
No-load input current
27 mA (@ 52 V DC input)
Included
PCB
All parts including heatsinks
The Elektor Milliohmmeter Adapter uses the precision of a multimeter to measure very low resistance values. It is an adapter that converts a resistance into a voltage that can be measured with a standard multimeter.
The Elektor Milliohmmeter Adapter can measure resistances below 1 mΩ using a 4-wire (Kelvin) method. It is useful for locating short circuits on printed circuit boards (PCB).
The adapter features three measurement ranges – 1 mΩ, 10 mΩ, and 100 mΩ – selectable via a slide switch. It also includes onboard calibration resistors. The Elektor Milliohmmeter Adapter is powered by three 1.5 V AA batteries (not included).
Specifications
Measurement ranges
1 mΩ, 10 mΩ, 100 mΩ, 0.1%
Power supply
3x 1.5 V AA batteries (not included)
Dimensions
103 x 66 x 18 mm (compatible with Hammond 1593N-type enclosure, not included)
Special feature
On-board calibration resistors
Downloads
Documentation
This is a soldering kit for the starters to learn soldering. After 1-2 hours soldering and assembly, and easy steps to set the Wifi name/password with a phone, you will get:
A real-time clock, it will get the world real-time from the Network timing protocol, you can set your local time zone easily
An Alarm clock, with loud noise
An Online world weather forecaster, about the local temperature/weather, you can easily change/alter your address/cities without any re-programming
To reduce the soldering difficulty, all the SMD parts have been soldered, you only need to solder the THT parts, and then set the Wifi network with a phone, and finally turn on the power to enjoy the success.
Included
ESP32 SmartClock kit mainboard
Batch of capacitors & resistors/connectors
Colorful LCD module
Lipo battery
Acrylic boards
Nuts & screws
Downloads
User Manual
Source code on GitHub
Discover the perfect fusion of science, music, and visual spectacle!
This compact yet powerful musical Tesla coil is designed with an advanced circuit and an upgraded booster top coil to produce long, thick lightning arcs – bringing raw energy to life right before your eyes.
Two Modes for Twice the Fun
Long Arc Mode: Emits lightning at a fixed frequency. At medium power, the arcs are safe to touch – giving only a slight tingling sensation.
Music Mode: Connect via Bluetooth and watch the arcs dance in sync with the music. It plays square wave tones, concentrating the energy into a stunning sparkling melody.
Stable Bluetooth & Smart Design
Equipped with a custom-developed Bluetooth chip, the coil connects smoothly with any smartphone, computer, or Bluetooth-enabled device. It also supports USB-C for added convenience. The coil is coated with a gold-clear ink for improved dust resistance and enhanced durability.
Easy Setup – Instant Magic
No audio cables needed! Just tighten the discharge pin, turn down the power and frequency knobs, plug it in – and watch the magic unfold. Whether placed vertically or horizontally, this Tesla coil puts on a mesmerizing show every time.
Fun Meets Education
More than just a gadget, this Tesla coil is an engaging tool for science education. It can wirelessly light up gas tubes or even bubbles, and the touchable arcs are completely safe to interact with. It's an unforgettable gift and a futuristic piece of art that’ll turn heads on any desk.
Specifications
Body Material
Transparent acrylic
Input Voltage
48 V
Discharge Frequency
5-50 Hz (lightning mode)
Included
Power adapter (EU)
Note: Before powering on, always turn both knobs fully counterclockwise to avoid sudden loud shocks from the arc.
Pull Down Lever For Highest Score!
This Elektor Circuit Classic from 1984 shows a playful application of CMOS 400x series logic ICs in combination with LEDs, a highly popular combination at the time. The project imitates a spinning-digit type slot machine.
The Game
To play the game, first agree on the number of rounds. Player 1 actuates the switch lever as long as desired and releases it. The LEDs then show the score which is the sum of the 50-20-10-5 digits lit up. If the Play Again! LED lights, Player 1 has another, “free” round. If not, it’s Player 2’s turn. The players keep tab of their scores, and the highest score wins.
Features
LEDs Indicate Score
Multi-Player and Play Again!
Elektor Heritage Circuit Symbols
Tried & Tested by Elektor Labs
Educational & Geeky Project
Through-Hole Parts Only
Included
Printed Circuit Board
All Components
Wooden Stand
Bill of Materials
Resistors (5%, 250 mW)
R1,R2,R3,R4 = 100kΩ
R5,R6,R7,R8,R9,R10 = 1kΩ
Capacitors
C1 = 4.7nF, 10%, 50V, 5mm
C2 = 4.7μF, 10%, 63V, axial
C3,C4 = 100nF, 10 %, 50V, ceramic X7R, 5mm
Semiconductors
LED1-LED6 = red, 5mm (T1 3/4)
IC1 = 74HC4024
IC2 = 74HC132
Miscellaneous
S1 = switch, toggle, 21mm lever, SPDT, momentary
S2 = switch, tactile, 24V, 50mA, 6x6mm
S3 = switch, slide, SPDT
IC1,IC2 = IC socket, DIP14
BT1 = PCB-mount CR2032 battery retainer clip
Desktop Stand
PCB 230098-1
Not included: BT1 = CR2032 coin cell battery
Looking for a fun DIY Christmas project? Assemble and program this extra-large Poly Reindeer figurine and make its LEDs shine all the colors of the rainbow! Ideal for both beginners and advanced makers! This educational and fun kit combines soldering and programming skills in one XL-sized project. First, you will need to solder some simple components onto the copper plated circuit board. The components include fancy RGB LEDs that have a special diffused effect. Once the soldering work is finished, you will be able to program the colors and light effects of the different LEDs thanks to the onboard Arduino Nano Every. The Arduino will be pre-programmed with some basic LED effects, so your kit will work once you power it with the included adaptor. Or you can choose to write your own code based on the available example code. Programmable add-ons The printed circuit board of this project is designed especially so you can add different add-ons. For example, add an OLED screen to display messages or program it to countdown the days until Christmas! Or add an IoT Tuya chip so your project can communicate with your smartphone. You can even add a sound microphone, motion sensor or light sensor. Features XL-sized & copper plated circuit board (PCB) in the shape of a polymetric reindeer 22 addressable (programmable) RGB LEDs 14 x 5 mm RGB LEDs 10 x 8 mm RGB LEDs Arduino Nano Every Onboard push button USB A to USB micro cable for programming USB A to USB B cable for power supply Wooden holder Complete manual and video available in 5 languages Example code for Arduino available Educational & fun for all ages and skill levels Expandable with lots of add-ons: an OLED screen a smart IoT sensor to connect with your smartphone a microphone sensor and more! Not included: soldering iron, soldering tin, pliers and an soldering mat Specifications Dimensions: 168 x 270 mm Power supply: 5 V/2.1 A max. (cable included)