This logic tip latches on pulses. The TTL circuit was suggested by Radio Electronics magazine in August 1977. The power supply must be 5 V.
This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in...
This circuit was found in a 90s Electronic Engineering. The quadruple operational amplifier can be...
I found this circuit in an English publication from 1989. This configuration can be mounted with...