This circuit was found in an American publication from 1965. The circuit uses components from that time. No information was given about the excitation transformer. Observe the high input power.
Using a MAX644 this circuit was found in the April 1989 issue of Radio Electronics magazine. The...
This oscillator produces a modulated signal using a unijunction transistor. We found it in an...
Powered from 20 V dual power supply this circuit sources 20 W to a 4 ohm loudspeaker. The IC is...