Simple logic test (CB10027E)

This simple circuit can make use of any general-purpose transistor. The power comes from the circuit being analyzed.

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Digitally controlled audio switch (CB12748E)
This circuit can serve as a basis for a digital mixer or simply for a noiseless switch of audio...
Negative high voltage source (CB8122E)
We found this circuit at Popular Electronics. The components are still current. Changes can be...
Photodiode selective preamplifier (CB7816E)
Found in American documentation, this circuit for modulated infrared signals can be tuned to a...