Multi-Position Mains Switch

The circuit shown here was born out of necessity after one of our colleagues had just renovated his kitchen and realised afterwards that there were not enough switches. Obviously he was not too keen to partially demolish the kitchen to install a few additional wires in the already tiled wall. That’s how the idea arose to develop a clever electronic circuit that would operate two lamps with only one switch.

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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Download Gerber file: 014097-1.zip

Component list

Resistors:
R1,R2 = 10kOhm
R3 = 33kOhm
R4 = 100kOhm
R5 = 10kOhm
Capacitors:
C1 = 100nF
C2 = 10µ F 63V
C3 = 4µ F7 63V radial
C4 = 470µ F 16V radial
C5 = 2µ F2 63V axial
Semiconductors:
D1-D7 = 1N4148
D8 = 1N4001
T2,T3 = BC547B
IC1 = 4017
IC2 = 78L09
Miscellaneous:
K1,K2,K3 = 2-way PCB terminal block, lead pitch 7.5mm
Tr1 = mains transformer 9V 1.5VA, e.g., Hahn EI 3022021
B1 = B80C1500 (round case) (80V piv, 1.5A)
Re1, Re2 = 12V relay, e.g., V23057 B0002 A101 12V (Schrack)
Case, Bopla, OKW or Schyller