2019-07-29, 02:27 PM
(This post was last modified: 2019-07-29, 02:41 PM by CapnKernel.)
(2019-07-26, 11:22 AM)FMJ Wrote:(2019-07-24, 12:16 PM)CapnKernel Wrote:(2019-06-11, 07:52 PM)FMJ Wrote: and the voltage dividers for shunt and voltage measuring hooked up to it:
FMJ, what value and power is your shunt resistor?
It is a 0,05 Ohm ceramic resistor. It is rated at 5W, not because that's necessary, but because it was easy and cheap to get on E-Bay.
You can also buy a 0,02 or 0,01 Ohm resistor. But because the normal current is so low, I decided to produce just a little bit more of heat in favor of a higher accuracy.
I bought some of these:
https://www.aliexpress.com/item/32872505913.html
I figure if it gets too hot, I can put some in parallel, which as you say, will sacrifice accuracy for a reduction in heat.
I did see some large flat 4W SMD versions. I might get some of those in the future, but I thought the through-hole ones would be better for prototyping.
Mitch.