This Star Trek red alert circuit was found in the July 1990 issue of Radio Electronics magazine. The power transistor must be equipped with a heat sink.
This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according...
This amplifier was obtained from the CA3140 datasheet, an operational amplifier with JFET at the...
The frequency generated by this circuit depends on the crystal used. Frequencies up to a few tens...