This is the traditional audio preamp configuration with the National Semiconductor LM382. The circuit has good gain and can be used with magnetic pickups or from signals from an auxiliary input.
With the components indicated, the circuit oscillates at 20 MHz. The coils and capacitors can be...
We found this preamplifier circuit with high input resistance, on the order of 30 M ohms, in an...
This symmetrical 1.2 to 35 V source was found in a 1994 documentation. The integrated circuits are...