Preamplifiers for high or low impedance microphones. According to the model, can amplify a signal coming from a high or low impedance microphone. Allows gain adjustment via potentiometer insert in the circuit.
Preamplifier with electret microphone included in printed circuit. With a line output signal level it is the logical solution to put sound into any musical device with aux input, such as musical sets, mixing tables, small transmitters, etc.