We found this circuit in a 1973 documentation. The null adjustment trimpot is 10k. The circuit can be powered by symmetrical sources from 9 V. The diodes on the bridge can be 1N4148.
Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of...
This circuit retriggers when a new pulse arrives. It does this by discharging the capacitor. The...
This circuit triggers a buzzer or other warning device when the light falling on the sensor is cut...