Hello everyone.
I have 4 laptops PS, 20V 2A. Willing to mage 4 independent channels 1-15V, 1A Max; Finally I prototype just one PS. a large multiply LC filers, Ground wire, 2-sense etc.. Finally i got what I want , around 50 microVolts change when load changing 0 to 1A. And not able to detect a noise from the laptop PS. ( scope 1mv/div shows nothing .... ) OK ...
Schematics are basic, In my existing I use OP07 , it connected as a single supply and has 0.7 Volt bottom line, so PSU produce around 1.6V ...
QUESTION: If I will use OPA244 instead OP07. will my minimal output decreased ? I would be happy to have 0.5 V output. Or advise on any reasonable precision opamp, with single supply and correctly operating with millivolts above the ground.
[ The schematic a basic, simplified for simulator, R1 - just load for VR ( otherwise don't work) ]
2 question, not important but nice to have some idea:
to advise a current limiter as a trigger. Planning to shunt pin-3 on opamp to drop the voltage. And button to recover. And need to thing to link triggering signal to other PS, and power sequencing, keeping the ground independent ( relay, or some opto things ... )