modified 3 months ago

11bit CV from 2 8bit PWM outputs

00:21:50

The 2 voltage sources represent the 2 PWM outputs of a microcontroller. Attiny85 in my case. 
The 5k load resistor represents a pair of 10k trim pots that I'm using on the output. 
Obviously, an integration capacitor is also required across the load to get a smooth CV. The maximum CV is 1V when both PWM outputs are at 100%. 
An 18k in series with a 4k7 yields 22.7k.
A 150k in series with a 10k provides the 160k. 
The 11 bit val has a range from 0 to 2047. 
int(highByte(val) * 36.5) supplies the 22.7k
While lowByte(val) is fed to the 160k

published 3 months ago

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