I am currently using the Arduino Pro PWM outs to generate CV for a Serge modular. For now using a DAC is out of the question and I'm trying to get the best frequency value to generate useable, steady pitches.
If you were arbitrarily using a 2.2k with a 2.2uF, using that calculator posted here that would be 32.9Hz correct?
So would a cutoff frequency of about 1/50th of 490Hz (running frequency of PWM) be sufficient? I'll go testing on my breadboard, but I'm finding this to get tedious very easily..daverj wrote:So to effectively filter out the PWM cycle frequency the filter must be set many, many octaves below the PWM cycle frequency. At the same time, the lower the frequency of the filter, the longer the settling time of the DC output.
This thread is the closest I've found on this subject, and I'm glad to find that it's putting me in the right direction.
So far I'm using values similar to stk, and running my outputs at about 40Hz. I would be thrilled to hear any input or advise on determining the best RC values for improving on my current configuration!