Electronics > Repair
DC power supply doesn't work with DC motor
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tjkolev:
@Zena E,

Thank you for the schematics!  :-+ I didn't have the right components in my collection. I used a 180 ohm resistor, 2x 1600 uF 16V capacitors. My hi current diodes wouldn't go into the holes of the breadboard, so I used skinnier ones. But hey - it worked like a charm! The diodes got really hot, and one of the jumper wires started smoking...  ;D I'll use proper components, and package them somehow on the PSU cable.

Thank you all for your time and suggestions!

Cheers!
tjk :)
ledtester:
I wouldn't use a breadboard for a high-current application like this one. Besides, as you have noticed, the leads of the high-current diodes don't fit.

The diode leads are likely going to be too large even for prototyping boards that have copper pads.

Since this circuit only has a few components a quick and easy way to test it out is to solder the leads of the components together -- perhaps with help of thick solid wire -- creating a "free air" circuit without a supporting board. Once you get it working you can turn your attention to making a more permanent version of it.
Xena E:

--- Quote from: tjkolev on September 19, 2024, 03:09:59 am ---@Zena E,

Thank you for the schematics!  :-+ I didn't have the right components in my collection. I used a 180 ohm resistor, 2x 1600 uF 16V capacitors. My hi current diodes wouldn't go into the holes of the breadboard, so I used skinnier ones. But hey - it worked like a charm! The diodes got really hot, and one of the jumper wires started smoking...  ;D I'll use proper components, and package them somehow on the PSU cable.

Thank you all for your time and suggestions!

Cheers!
tjk :)

--- End quote ---

Glad to help.

Like ledtester says about the construction its simple enough to sky wire.

Unfortunately you will need diodes that will handle the full current of the application. Perhaps one of the twin packaged T0 220 types bolted to a metal heatsink. Little 1 or 3 amp ones will burn out eventually.

The component values for the rest are basically what works for you, the resistance was suggested as a minimum, and the capacitor needs to be big enough to give the starting kick.

Regards,
Xena.
rfengg:
Hi @Xena E,

Great idea.....do we need the series diode in line with the PS also though? If the series diode is replaced with a short, would it not work?
Xena E:

--- Quote from: rfengg on September 19, 2024, 06:11:31 pm ---Hi @Xena E,

Great idea.....do we need the series diode in line with the PS also though? If the series diode is replaced with a short, would it not work?

--- End quote ---

Good question!

It possibly would, I added it as I can't be sure how the OP power supply would react, without the diode it may still try to lead supplying the current, as the PS voltage will be ≈ 1V more than the capacitor and still go into fold back limiting, leaving it still unable to start the pump motor.

This way may not be strictly necessary but ensures results, perhaps the OP will report back if he tries it.
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