Mini Organ (CB21653E)

This toy organ was found in Popular Electronics from January 1967. It can be constructed from modern equivalent transistors.

2 A Transistor Fixed Power Source (CB15764E)
The block shown in the figure is a basic source with a configuration widely used in technical...
7 to 18 V x 50 to 500 mA Power Supply (CB20220E)
The output current of this source is determined by resistor R. For 20 ohms, we have 50 mA. For 10...
Stereo Regenerative FM Radio (CB3828E)
This circuit, for its simplicity and the fact of using a super-regenerative detector only works...