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  • It'll be okay, we'll make it.onedawnconstant@climatejustice.social
    May 20, 2025, 2:05 AM

    #Electronics #DIY #solarpunk
    Okay, I thought I was just tripping but the advertised "max current" of the mosfets I have salvaged from junk electronics showed as being "100 amp at 75V".

    That was the biggest lie I could ever be told. They are 10A continuous at the 40 volts I have been using them at. Just to make sure that inductive flyback wasn't to blame, I took a long section of rod and and another junk battery with a switch for the gate and hooked it up.

    Sure enough, even with the wheels in the air and the brakes completely off, poof! The flyback was only about 40 mV, thanks to the flyback diodes I had obtained earlier. Bulk capacitors are hardly necessary, but I'll throw them in anyway.

    I will be searching for some supremely powerful IGBT modules or some extreme FETs. We're dealing with peaks of over 1kA current!

    Something's telling me it just might be better to rig it up with a switch for now and look for some better transistors to buy instead of plunder.

    If all this works out, then I'll be able to move far heavier things than my ebike could.

    An old, rusty, dingy looking Westinghouse 436 marketeer utility car, with equally shoddy looking car batteries. It's up on jack stands. A vice lay flipped upside down with the remains of a FET clamped within. A random modified car alternator from the last scrap search is also sitting next to the vice.
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