This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120 V DC or from 42 to 84 V AC. The circuit has a forehead button that activates an indicator lamp.
This circuit converts BCD inputs to analog voltages. The operational amplifier must be powered...
Found in a Popular Electronics from the 90s, this circuit triggers an indicator when these lights...
This circuit triggers a buzzer or other warning device when the light falling on the sensor is cut...