About the article

Energy-saving switch

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Energy-saving switch
If the effort of chasing out channels and replastering for a complete new circuit is too much, then this circuit might help. Normal operation of the light switch gives gentle illumination (LA1). For more light, simply turn the switch off and then immediately (within 1 s) on again. The circuit returns to the gentle light setting when switched off for more than 3 s. There is no need to replace the light switch with a dual version: simply insert this circuit between switch and lamp.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1 = 100
R2 = 680
Capacitor:
C1 = 4700µF 25 V
Semiconductors:
D1,D2 = 1N4001
Miscellaneous:
K1,K2,K3 = 2-way PCB terminal block, lead pitch 7.5 mm
F1 = fuse, 4AT (time lag) with PCB mount holder
TR1 = mains transformer, 12V @ 1.5 VA, short-circuit proof, PCB mount
B1 = B80C1400, round case (80V piv, 1.4A)
RE1 = power relay, 12V, 2 x c/o, PCB mount
RE2 = miniature relay, 12V, 2 x c/o, PCB mount
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