Hi. I am trying to control the switches on a old musical keyboard. I had planned to put a npn transistor across the switch and use the arduino to control the base through a resistor. It didn't work. The keyboard is powered by a split rail 15v supply. One side of the switch measures -15 volts the ot…

Using transistors as switches.. problems

MarkT October 17, 2012, 10:05pm 10

Wow, hand-laid-out PCB traces! Takes me back.

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