We had found this circuit in a January 1961 Radio Electronics Magazine. Using it is possible to take measures from the gain of transistor with a common a multimeter.
This is a conventional double T oscillator, where the frequency is determined by the double T...
This is the power supply for the amplifier in the previous circuit. We found it in the same Radio...
This circuit is intended for the control of a heating system motor with up to 10 kW of power. The...