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MIDI to CV thats EZ

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natbit

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Hi everyone, I was looking at making a simple MIDI to CV convertor for with my old synth [KAWAI 100F] using a 16F84a and DAC0800 and was looking for some neat sugestions other than going for more bits...the synth itself requires a simple linear -0.11 V/note response from 3.6 V -> 0, easy enough, when inactive though it is -12 V -read from synth...my question is 1) how can i breadboard a circuit that will switch from ~-12V to the required note when active? AND 2) Is -12 V really necessary? *I have synth circuit - CV input goes to PC741C opamp/comparator * and so how can a pot be placed there somewhere to vary that 'inactive' CV whilst/during breadboarding? thanks.
 
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