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Home › Magazines › 2005 › February › LED Bedside Lamp

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LED Bedside Lamp

with turn-off delay

Published in issue 340, February 2005

LED Bedside Lamp

If you are not lucky enough to have access to expensive test gear then lamp circuits using LEDs offer a good chance of success and allow a little bit of electronic experimentation. One of our readers has come up with this simple but useful addition to the bedside table. The lamp is activated either by pressing a push button or automatically when the in-built microphone detects a noise.

Components

Relevant products

Resistors:

R1 = 15kOhm 

R2,R8,R9 = 100kOhm 

R3 = 22kOhm 

R4 = 5kOhm 6

R5 = 6kOhm 8

R6 = 1MOhm 

R7 = 390kOhm 

R10 = 10kOhm 

R11 = 18Ohm 

Capacitors:

C1 = 22nF

C2 = 47µF 16V radial

Semiconductors:

D1 = LED, white, e.g., Conrad Electronics # 153867

IC1 = TLC274

T1,T2 = BC547B

Miscellaneous:

Bt1 = battery holder for 4 NiMH cells

K1 = charge socket for batteries

MIC1 = electret microphone capsule

S1 = pushbutton, 1 make contact

PCB, ref. 030122-1

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (U050274.pdf)
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PCB layout (030122-PCB.pdf)
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Order from Elektor 
PCB
030122-1
 

Order from Eurocircuits 

PCB
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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