We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
The circuit shown in the figure serves as a pre-amplifier with a voltage gain of around 12 times,...
Based on Texas Instruments documentation, this circuit serves for sensor interfacing. The circuit is...
This article is from a publication by A. Fanzeres from the 70s. We kept the original text. This...