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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Beeper (CB24562E)
This programmable sound circuit was found in the July 1978 issue of Radio Electronics magazine. It uses an...
PUT with 2 Transistors (CB4216E)
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
Zener Diode Tester (CB5333E)
This simple test lets you measure zener voltage. The power must be higher than the diode tested...