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Low Pass Filter for PWM

A project log for DIY Harmonic Drive Equatorial Mount

A home built equatorial mount for my telescope built mostly recycled components I have had lying around.

Jerry BiehlerJerry Biehler 03/09/2015 at 21:410 Comments

I used LTSpice last night to do some circuit simulation. I hooked up the SiTech controller to the scope and found it uses a 23.45khz base frequency. Popping this info into LTSpice allowed me to come up with a pretty simple 2 pole low pass filter that should give me reasonable ripple and good step response with a 10v max output.


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