"R1" are 10k (R94, R98, R96 and R89 on the board), R2 are 30k (R58, R59, R60 and R61), and R3 are 13k (R80, R81, R82 and R83).Īll stock, with the gain controls at minimum, the input clipping indicators (red LEDs) come on when the input signal reaches around 3.6Vpp. The "Rgain" in the Wikipedia article is the gain adjustment potentiometer mounted on the top board, and accessible on the front panel, with a 470uF DC-blocking capacitor in series with it (to minimize the DC-offset on the outputs), as well as a 33 ohm resistor (to limit the maximum gain). The third opamp is one half of an NJM4565 (U18 in this case). ![]() The NJM2122's in these preamps are wired as the two input opamps in a three-opamp instrumentation amplifier.
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