Hi all.
I have been in to electronics for about a year now, and the obligatory power sypply have been built and put to use.
So in the weekend i decided that i need a load.
It's based on the one from daves video, but suitet to what i have in my junk boxes. (Amazing how much you can accumulate in just over a year )
Late last night i got it assembled for a test before i commit to build a chassis ( in leftover plywood of course
), but it didn't work. It was bed time any way ..
Today i got it to work though. somebody switched two wires
Allthough it is working, the current measuring display does not follow the current on my multimeter. i've checked with two and they agree. Over a range of 4 A the meter is out a whole amp.
You can see in the scamatic that op amp c is amplifying the voltage from the load resistor by a factor of 10. I need this because i only have a 0-30 v led meter. The meter works fine. I've checked it beforehand with my brand new AM520 DMM
Is there anything inherently wrong with what I am doing here?
Thanks in advance. I love the forum and the videos