This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
This is the receiver for the previous circuit. The audio amplifier supports equivalents. The...
We found this circuit in a 1983 English magazine, but it can be easily assembled today, as all...
This is a possible setting for a Colpitts oscillator operating in the audio track. The shunt coil...