Use with a PIR motion detector (which are only Normally Closed when not tripped, and go Normally Open when tripped) to drive a relay to reverse output (IE 2nd relay will go Normally Closed when PIR is tripped - to drive a light, buzzer, logic output etc) Diode = 1N4001 Q1 & Q2 2N2222 (can drive large relays up to 0.5A coil), Resistors 1/4w (signal power only) Relay = 12V automotive or PCB. Can also drive 5V relay with 5V power supply
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