Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control the SCRs driving phases. SCRs can be equivalent current types.
This configuration shows the simple way to use a varicap diode to tune an LC circuit. Capacitor C1 must be...
This small-range MW transmitter can be used as a wireless microphone. The circuit is from an...
This interesting circuit, which can be used as an alarm, was found in a 1997 documentation. It...