This filter is from a 1977 publication. The circuit employs three 741 or other operational amplifiers. The supply must be symmetrical and the components with (*) are low tolerance.
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...