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.
This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply...
This circuit was found in the September 1984 issue of Radio Electronics magazine. The circuit has...
This circuit is regulated by zener and provides a voltage of 9 V. The circuit is from a Radio...