Keybed PCB from Yamaha PSS-170
from The Lonesome Driver Hosted by The Lonesome Driver
Just desoldered the brain board from this old Portasound, trying to figure out how exactly this works. I haven't finished figuring out the paths exactly, but broadly speaking it's [a diode matrix]. TIL. Cool idea: 8 in, 6 out, 44 keys. It took ...
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