Bias oscillator for tape recorders (CB7339E)

This circuit was found in a 1967 Electronics World. The circuit uses components of the time that are difficult to obtain, such as the transformer.

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Signal injector (CB21554E)
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Automatic Dimmer (CB18864E)
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...
Voltage doubler with 555 (CB1230E)
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