Direct Coupling Amplifier (CB20042E)

Applications for this circuit include hearing aid, stethoscope, etc. Transistors are general purpose and powered by a single 1.5 V battery.

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Diode test (CB20735E)
This simple diode test appears at other points in this section. Or circuit can be adapted to use...
10W Inverter Compound Amplifier LM1875 (CB26269E)
Found in Electronics Now magazine in an issue from the 90s, this circuit is different from the...
Phase Inverter (CB15065E)
This circuit inverts the phase of an audio signal, maintaining its intensity. The transistors can...