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.
The components used in this 80's circuit are not common today. The circuit is very sensitive and must...
This circuit is from the 1993 Linear Technology Applications. We can implement the same oscillator...
We found this circuit in a 1967 Electronic Design. The circuit used a MOSFET of the time, which is...