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 constant current charger from 1997 Linear Technology Applications uses common components at...
This circuit produces a single pulse whose duration depends on the capacitor. The circuit is from an...
Found in an old American documentation, this circuit uses neon lamps as a reference to obtain a...