Electronics > Beginners
Feedback on power supply 0-30V 0-4A
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d4n13l:
I guess is a short of cheap one, the brand is radox, 535-177.

I just discovered that the IC1B is blown :(, probably why I'm having problem with the current regulation, but I'm not sure how that happened, if it was with the current circuit or previously when I was making tests. According to the datasheet the supply voltage for the LM358 is 32V max. which may be other cause :(
xavier60:
I wonder if the LM358 will work properly if powered from the PSU's output which can be allowed a defined maximum of 27V.
The negative pin would have to be supplied with -5V to satisfy the LM358's minimum supply voltage of 5V.
There might be other tricks to increase the voltage range.
d4n13l:
Working with 35V from B1 is turning to be a pain, I'll switch to a 12V transformer and see if everything works as expected. Also I could directly connect the display, it's gonna be much simpler.
David Hess:

--- Quote from: d4n13l on July 28, 2019, 08:17:21 am ---1. You're right it's unregulated, I don't know a good and efficient way to get 1V regulated from 34V input, I'd love suggestions.
--- End quote ---

A zener diode shunt regulator would be a big but simple improvement.  Or 1.25 volt bandgap shunt references are inexpensive.  If you do not have anything better, than even an LM317 or LM317LZ with the adjustment pin tied to ground and a 120 ohm or whatever resistor shunting the output makes an instant 1.25 volt reference.
xavier60:
The divided output from a 5V regulator could be used  for the CC reference. The 5V could also power the meter.
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