100A PWM Amazon.com just wondered if this pwm has automatic brake for wire feed motor, to stop wire stick out on my old blushed motor century welder. Or is this control or motor brake only manual, it seems hard to tell by the description. Any body know about this pwm. THANKS.
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It is forward reverse and brake. It is an h-bridge using mosfets. the question would be how the switch is wired. The center position appears to be the brake position. or the speed control clicks off and that brakes it…
This one isn’t quite the same but darn close.
(they soldered the display on, and there is a board number on the amazon one.)
https://www.aliexpress.us/item/3256809213161184.html?
This guy did a review on it. You might be able to clean something from it. I don’t know.
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Do you think this one is better choice, or more likely to work as brake when trigger is let go, Thanks for the help with all the replays. I see the big 33 pound wire feed units,all set up ready to go for around 200.00$,though I would rather learn the cheapest way to fix any good welder with real power duty cycle.THANKS. I may TRY one of these units in few weeks.
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I think they are probably both the same except one has the screen connected to cables, which is probably preferable in your case since you can mount it to the case. If there is a difference it might be in gen1 vs gen2 type of circuit.
Look in that video and see if he does anything with the switch. There is some precedence for having the default no signal to be a brake.
I am guessing that unmarked 16-pin chip is a microcontroller that drives the display and reads the state of the on/off/on switch, and controls the h-bridge and maybe the pot.
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Ok thanks Sean I will try that one when I get caught up.
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it looks like the one you posted is the bh-17n-d
And the one from aliexpress might be a knock-off of the bh-17n-c model. 
It looks like there are 6 inputs where the switch connects, and the ones that advertise without brakes only have 3 wires coming from the switch, and the ones that have brakes have more wires.
The guy that did the video i posted claimed he was going to make a video about how to use it with arduino… then actually commented 2 years later search his playlist, but I did a not very thorough search and didn’t see one.
I don’t know if he failed, it was too similar to a previous video with an earlier model, or I just didn’t find it.
My complete and utter guess is that it is possible to use that. You would still use the knob for the wirefeed speed, then have something like a transistors to mimic the switch positions based on whether there is current from the trigger switch.
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