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This circuit uses a flat piezoelectric wafer, glued inside a plastic box, as a finger tap sensor. With each tap of a finger to the box holding the wafer, the circuit turns on and off AC or DC power to an external device. The circuit is powered by a ...

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays

2 Form A 8 A Small polarized power relays