The cheapest mosfet anti spark switch build ever, hopefully

[b264]

@Agressivstreetlamp

Does anybody know the internal workings of the xt90s ? Like how does it suppress the spark?

Yes. These two posts shed some light on that. Ask in the loopkey thread if you want more info

Tackling the anti-spark problem (Title by a good friend)

Most “inrush limiter circuits” fail because they are operating in linear mode during inrush. It’s a design limitation on almost every one. Imagine a FET is a resistor with a variable resistance. When it’s “off” the resistance is [nearly] infinity and when it’s “on” the resistance is [nearly] zero. That’s all fine and dandy until you add capacitors to the load, like the filter capacitors on VESC and other ESCs. Right when it turns on, it’s effectively a momentary short circuit with [not really…]…

How to make an XT90 Loop Key

Arguably, the most reliable way to control power to an ESC [pair] is to use an XT90S loopkey. [20190219_024916][20190219_024931] It may not be the prettiest or the shiniest or the most foolproof, but it probably will outlast almost any other way if done correctly, and it’s certainly the cheapest. This does have antispark characteristics if you use the “XT90S” instead of the “XT90” variant of the female connector. You definitely don’t want to use the female XT90. Essentially, you make “a k…