Found on a Radio Electronics this 80's circuit uses two common SCRs driving lamps. This setting appears elsewhere in this site and this section.
The gain of this amplifier is 10 times and the excursion to the output voltage is 6.0 V (peak to...
This circuit has the coil tuned input according to the operating frequency range. The indicator can...
The sensor of this circuit is a large surface diode. We believe that a small solar cell can also...