Nicad Charger (CB13550E)

This circuit is from 1973 documentation. The transformer has 500 mA of current and the transistor can be the TIP32 mounted on a heat radiator.

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Magnetic Preamplifier (CB17072E)
This circuit with transistors from a 1995 publication. The circuit is powered by a voltage taken...
Unit gain audio mixer (CB7987E)
Found in a 90’s American publication, this circuit has a voltage gain close to 1, as shown in the...
Hartley Continuity Tester (CB11947E)
In the figure we show how to use a small Hartley oscillator as a continuity tester. The component...