The correct way to add volume controls to a Yamasa machine
I recently did a volume mod on my machine. I know there are other ways for it to be done, but this is the "correct" way according to the data sheet of the amplifier chip.
There are 4 resistors that form a 1:2 voltage divider. If these are replaced with a 2K dual gang pot you end up with a nice clean volume control. The switch still allows for low mid and high range with folume from 0-100% in each position.
Happy modding.
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