MIDI IN/OUT/THRU module board. This MOB can operate at both 3V3 and 5V.
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paperboard 5x7cm
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2-pin (Molex-KK) 5V-GND power connector
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3-pin (Molex-KK) 5V-3.3V-GND power connector
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2 x bulk capacitor (tantalum) 10uF
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2 x led current limiter resistor 1Kohm and 680ohm
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2 x power activity led green 3mm
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3-pin voltage selection header
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3-pin (Molex-KK) serial Rx-Tx-GND connector
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3 x DIN5 pcb connector
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3 x data activity led current limiter resistors 1Kohm
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3 x data activity led green 3mm
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6 x resistors: 5 x 220ohm, 1 x 680ohm
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small signal diode 1N4148
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2 x decoupling capacitor C=100nF
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IC optocoupler 6N138 with socket DIP4+4
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IC Hex Schmitt-Trigger Inverter 74LS14 with socket DIP7+7