Originally Posted by lustrum
Put a radial lead electrolytic cap (4.7uF) in place of the axial cap and still have the same issue. Also put a meter to the power output and it had no fluctuation, only a solid 5.75VDC once the pot was turned to ~50% and higher.
I'm thinking it is the chip now... I'll swap it out when I get home and see.
Don't trust your meter to measure the output of a PWM. You may need a scope to see the changes.
The reason is, my meter reads the voltage for a moment before it displays on the screen. When I put it on my PWM, it says 0v until I get upwards of 40%. Then it says 9v the whole time - It's simply because the response time of the meter is higher than the off cycle of the PWM at that setting. - IOW, it's not off long enough
for my digital meter to display 0v before the PWM fires high again.
Hook a 9v lamp, or LED (With the proper voltage divider) - They should be able to show you that current is flowing, but still have the response time to let you see
the "off" portion of the pulse.