This buzzer trigger can be used for small alarms. We find it in an 80’s American documentation. The supply can be done with voltages from 3 to 18 V.
This circuit uses components of the time. We found it in a 1968 US documentation. The delay is 100 ns...
This circuit compresses the dynamic range (amplitudes) of an audio signal. The circuit is passive and...
This circuit is from an Argentine publication from 1973. It provides a signal to an amplifier from...