Voltage window switch

A voltage window switch is in practice the basic lower window limit of this circuit is roughly 3V and the upper limit is 9V. The window range can be extended by fitting a suitable range

Part List R1-2=10Kohm D1=9V1/ 0.5W Zener IC1=TL072 R3=1Kohm D2-3=1N4148 Q1=BC214 R4=2.2Kohm D4=1N4001 RL1=12V >120ohm Relay R5=4.7Kohm RV1-2=47Kohm pot.

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