Published in Popular Electronics with the curious name of Obnoxious Noisemaker, this 1968 circuit generates random sounds that are reproduced on a loudspeaker. The power transistor can be a BD136.
This circuit produces a signal at a frequency of 455 kHz, based on a ceramic resonator CSA455E, by...
This simple unijunction circuit is from a Radio Electronics from July 1963. It can be assembled with a...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...