Found in an American 1980s documentation, this circuit compares signals from two TTL sources, providing an output that depends on the frequency difference. The circuit can be used as a shield.
This is one of the many modulated siren versions that can be found on our website. We found it in a...
This circuit was found in the May 1983 issue of Radio Electronics magazine. The SSM7046 integrated...
This isolated shield uses a common optical coupler that supports several equivalents. The resistor in...