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 simple alarm with integrated CMOS sounds a piezoelectric transducer when the sensor circuit...
In this application we show how to get tuning from 0 V to an LM350 regulator IC. The setting also...
We found this configuration in a Radio Shack documentation from 1977. Here we have the way to...