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Home › Magazines › 2009 › December › Minimalistic Time Switch

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Minimalistic Time Switch

A lot of features in a small package

Published in issue 396, December 2009

Minimalistic Time Switch
A time switch lets you save a considerable amount of energy by switching off equipment when it is not being used. However, time clocks from building merchants tend to be bulky and not especially easy to use. The circuit described here provides a distinctly larger set of features and is very compact, so it can easily be built into an existing piece of equipment.

Components

Relevant websites

Free downloads

Resistors
all SMD 0805
R1 = 390Ohm
R2,R3,R4 = 4.7kOhm
R5,R6 = 22kOhm
R7 = 180Ohm
Capacitors
C1 = 2.2µF, SMD 0805
C2,C4 = 100nF, SMD 0805
C3 = 470µF 6.3V, or GoldCap 0.1F or 1F 5.5 V (see text)
Semiconductors
all SMD, except D3
D1,D3 = LL4148
D3 = LED, red, 3mm
T1,T2 = PMV45EN
IC1 = MAX1615EUK+T
IC2 = DS1337S+
IC3 = PIC12F683-I/SN, programmed, Elektor Shop # 090823-41
Miscellaneous
X1 = 32.768kHz (CL = 6pF!, e.g. Farnell # 1216227)
S1 = pushbutton SPNO, 6mm (MCDTS6-5N)
K1 = 4-pin SIL pinheader
K2 = 5-way SIL socket
K3 = 2-pin SIL pinheader
PCB, # 090823-1
Project software # 090823-11.zip (source- and hex code file)

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

 

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PCB PDF
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Order this magazine 
Magazine December 2009
UK396 (USD 7.50)
 

Order from Elektor 
PIC12F683-I/SN, programmed
090823-41 (USD 11.00)
PCB, bare
090823-1
 

Free downloads 

Software

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

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