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post #13 of (permalink) Old 03-11-2016, 05:09 PM Thread Starter
drjustice
Algae Grower
 
Join Date: Feb 2016
Posts: 13
I am still away and responding on my phone but basically:

Take a wire from the arduino pinout to the +leg of a capacitor.

Connect -leg of the capacitor to a diode going to ground and

Connect same -leg of the capacitor to voltage out.

You end up with pwm going from 0 to +5v from the pin, converted to -5v to 0v to Vout.

It's half of the standard circuit to convert positive pwm voltage to a sustained negative voltage.

http://www.eevblog.com/forum/blog/ee...rter-tutorial/

Now I just have to get back home from my week of travel and go ahead and do it.
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