This circuit was found in documentation from the 1970s. The transistor supports modern equivalents. L1 with C4 determines the frequency range of the signals that will be produced.
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...
This small battery-powered high-voltage generator was found in Radio Electronics magazine from...
This is a very simple configuration with a power transistor to control a DC motor from 3 to 12 V...