This simple ON OFF touch switch circuit is based on the well known timer IC 555 (IC1), which drives a relay that acts like a switch. The metal
surfaces can have what form we want, but it should be clean and very
close to the circuit.
Read more WC fan using 555
Touch plate MP1 in order to close the contact of relay RL1 [ON], or
plate MP2 in order to open the contact of RL1 [OFF]. The Led D2 turns on
when the contacts of RL1 are closed. Two small pieces of metal can be
used as sensor plates.
555 ON/OFF Touch Switch Schematic
Parts List
R1 = R2 = 3.3M
R3 = 10K
R4 = 1K
C1 = 10nF
D1 = 1N4007
Q1 = BC547
IC = NE555
12V relay
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