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Using CV sequencer with FV-1
Posted: Wed May 20, 2015 12:54 pm
by tjm215
What would be the best way to use a sequencer's cv to control a pot input on the fv1? dont want to exceed 3.3v but the sequencer I have puts out 5v. Im worried that a voltage divider will not supply a constant 3.3v depending on the dc adapter the pedal is plugged into.
Posted: Wed May 20, 2015 2:08 pm
by frank
A voltage divider is not a bad way to go. You could use an opamp with a gain of about 0.66 to scale 0-5V to 0-3.3V, etc. Really as long as the power supply goes through regulators to give you a nice 5V and 3.3V it shouldn't be an issue.
Posted: Thu May 21, 2015 8:22 pm
by tjm215
is there much risk in having the voltage go slightly above 3.3v? should i have to worry about resistor tolerance when calculating the voltage divider or is the chip able to handle that sort of inconsistency?
Posted: Fri May 22, 2015 11:12 am
by frank
The POT inputs will actually max out slightly lower than 3.3V so target a 0 to 3.1V range.
While transients slightly above 3.3V should be OK you do not want to run any continuous voltage above 3.3V. Better to run a lower voltage and if necessary scale up the POT value in code.
Posted: Mon May 25, 2015 9:45 am
by tjm215
excellent! thanks for the tips!