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Old 31st December 2005, 05:28 AM   #1
argonrepublic is offline argonrepublic  Canada
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Can anybody help with this IC? Yamaha offers no details or datasheet. The purpose of the IC is to convert Synth keys to a Keyvoltage. The voltage should be .25v@ key 1 and 4Volts at key 37.
I have attached a shematic
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Old 31st December 2005, 07:25 AM   #2
pinkmouse is offline pinkmouse  Europe
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What's your problem with it? It is most likely custom silicon, made specifically for Yamaha, and I would guess, a long time ago, as this would be implemented in digital these days.
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Old 31st December 2005, 09:33 PM   #3
argonrepublic is offline argonrepublic  Canada
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My problem is that I don't understand the circiutry so I don't know where to begin testing. I have no Key voltage.
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