Audio input and output stages module board. This MOB operates at 9V or more for VCC (rail voltage of op-amps) and VCC/2 for internal VR (reference voltage for virtual ground). The input is a buffer stage, the output stage has a selectable gain (jumper JSW2) between 1:1 or 2:1.
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paperboard 5x7cm
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2-pin (Molex-KK) VCC-GND power connector
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2-pin (Molex-KK) external VS-GND power connector
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4 x 2-pin (Molex-KK) input/output audio connector
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2 x bulk capacitor (tantalum) 10uF
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2 x led current limiter resistor 2K2Kohm and 1Kohm
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2 x power activity led green 3mm
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3-pin voltage VS internal/external selector header
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3-pin output gain selector header
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9 x resistors: 1 x 1Mohm, 2 x 470Kohm, 1 x 100Kohm, 4 x 47Kohm, 1 x 100ohm
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1 x decoupling capacitor C=100nF
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1 x bulk capacitor 47uF
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5 x filter capacitor 1 x 10uF, 3 x 1uF, 1 x 4n7F
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IC Dual OpAmp NE5532 with socket DIP4+4