Suitable for operation with high impedance microphones, this circuit was found in American documentation from the 90s. The transistor can be any general-purpose type.
This circuit generates a control tone that serves to adjust amplifiers, check audio cables. The...
An input voltage of 6 V rms produces an output voltage of 15 V in this doubler circuit that...
This interesting circuit of the American publication Electronics Handbook Volume XIII 1993 shows a...