Simple touch switch


        The MPF102 (Q1) can be replaced with a NTE451 or ECG451, but still widely available. JFET-N-CHAN, UHF/VHF AMP
The 2N3565 (Q1/Q2) can be replace with a 2N2222(A), BC107, BC108, BC109(A/B/C), NTE123A, or ECG123A.
The TIP31 (Q3) can be replaced with a NTE196 or ECG196, but is a common type and widely available.
NO suffix.

        The 'Touch Plate' can be anything non corrosive. I use a silver quarter. You can also use a small relay instead of the #53 bulb. The phone number for DigiKey is 1-800-Digi-Key. 



         Parts List :

         R1            : 22Meg resistor
         R2            : 47K resistor
         R3,R4       : 100K resistor
         R5,R6,R7  : 2K2 resistor
         C1            : Capacitor, 22΅F, 25V
         C2            : Capacitor, 22΅F, 25V
         Q1            : MPF102
         Q2,Q3       : 2N3565
         Q4            : TIP31
         La1           : Bulb, #53





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