555 ON/OFF Touch Switch
Components List
R1 = R2 = 3.3M
R3 = 10K
R4 = 1K
C1 = 10nF
D1 = 1N4007
Q1 = BC547
IC = NE555
12V relay
R3 = 10K
R4 = 1K
C1 = 10nF
D1 = 1N4007
Q1 = BC547
IC = NE555
12V relay
This touch switch ON OFF circuit is based on known timer IC 555 , which actuates a relay which acts as a switch. Metal surfaces may be the way we want, but it must be clean and close the circuit.
Tap plate MP1 in order to close the relay contact RL1 [ON] or MP2 board to open the contact RL1 [OFF]. The D2 LED lights when the contacts of RL1 closed. Two small pieces of metal can be used as sensor plates.
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