We found this circuit in an old English documentation. Its purpose is to synchronize circuits. The components support modern equivalents.
Found in American documentation from the 90s, this circuit shows how to derive a signal in the...
The sensor of this circuit is an NTC with a resistance between 200 and 1000 ohms. The resistor R1 must...
This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are...