Simple 6 or 9 V power supply (CB24317E)

This 1-transistor circuit for currents up to 50 mA was found in the August 1974 Radio Electronics magazine. The transformer is 50 to 200 mA.

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Rectangular Oscillator (CB12973E)
The oscillator shown in the figure generates a rectangular signal with a 50% active cycle (square)...
0 to12 V x 500 mA Power Supply (CB1391E )
This power supply can be implemented with a TIP32 providing an adjustable output at the 2k2...
Symmetrical 50 V Push Pull Switched Converter (CB5455E)
This switched circuit was found in an old documentation and no information about the transformer...