A long time ago I was asked to design a circuit to latch an alarm and drive a lamp in another room to indicate the allarm condition. The alarm output was temporary but the need was to latch it and be able to reset once the condition was cleared.
The circuit allows for direct or opto-coupled input, positive or inverted input and normaly open or normaly closed output. All controlled by jumper settings.
The PCB is double sided.
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