Hello Masters of Electronics,
I'm civil ingeneer, electronics are big unknown to me, but it wakes up my interest. I would like to control proportional pressure with electronic proportional pressure regulator. If I got right I need to control it with current from 0-1A at constant voltage of 18V. I would like to control it from Arduino.
In last weeks I was looking for helping material on internet... and I found Youtube series from EEVBlog (https://www.youtube.com/watch?v=CIGjActDeoM ...Circuit is shown at time 20:00) about making own Power Supply Unit. I took out "Costant Current" part, bought 18V, 1A Adapter... Here is Shematic pdf to download LINK
First I would really apreciate if someone can take a look onto Shematic and check if it is fine.
Secund thing...I want to reduce Arduino output 0-5V to 0-1V. I tried to do it with putting resistor in series in ratio 4:1 (look at shematic) but I doesnt work, I get much lower reduction as expected. Whats wrong, how ca I achieve it.
Instead of 1Ohm at the end I put 5Ohm resistor at the end for now...I expected current from 0-1A, but I got just 0 - approx.0,6A. Why is this like that?
Any help, suggestion, comment is highly appreciated.