BlackSportD
New Member
Interesting results. I cut the jumper (LK1) that feeds 12vdc to the control circuit.
Wired the 12vdc to E+/-, no hum.
Wired in a 9vdc battery to the control circuit V+/-, motor seems to run at 100%, no PWM.
RV1 has no effect, no control. I put a 1M ohm resistor in series w/ the 9v power supply, pump doesn't run at all, no noise. I put a 1K pot in series, 1ohm the pump is on, turn the nob into resistance and kaput.
Seems the control circuit does not like anything much under 9v.
Wired the 12vdc to E+/-, no hum.
Wired in a 9vdc battery to the control circuit V+/-, motor seems to run at 100%, no PWM.
RV1 has no effect, no control. I put a 1M ohm resistor in series w/ the 9v power supply, pump doesn't run at all, no noise. I put a 1K pot in series, 1ohm the pump is on, turn the nob into resistance and kaput.
Seems the control circuit does not like anything much under 9v.