This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The supply voltage depends on the operational amplifiers used.
This circuit shows how to use common logic functions to divide a frequency by 7. The output signal...
This circuit can be used in alarms, data links or áudio links using IR radiation. The circuit is...
This circuit was obtained from an American 80's documentation. It can be implemented with modern...