How to make an XT90 Loop Key

[b264]

@iespobolamas

is there a reason some people use Anti Spark devices instead of a loop key? this seems way simpler and less likely to fail

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…]…

TL;DR there aren’t really any “good” options for that yet. Once there are, loopkey will be cheaper. Until then, loopkey is better and cheaper.