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Please show me small circuit which uses following components : 1M ohm resistance,4.7V zener diode,NPN?
darlington,22micro farad capacitor,10 mega ohm resistance,beeper(buzzer). i have tried fridge beeper. but no use .so please tell me another one.
water level or droplet detector uses a small piece of veroboard or similar as detector in the bias circuit of the transistor.
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US $1,200.00




















































































