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.
A touch of the sensor makes the load bistable (load) connected in Q1. For a BC548, a 6 V or 12 V...
With the use of an additional diode and a resistor, the configuration of the figure can be...
This circuit was found in documentation from the 1980s. The circuit uses several components of the...