Electronics > Beginners
LAB POWER SUPPLY
glinjik:
So on with the smps changed out the caps from 10v to 16v I don't like the tolerance of the old caps the unit puts out 6.3v and caps 10v bit too close also the big filter cap from 200v to 400v the trimmer pot was 1k so I put in a 10k pot that works gets the voltage down to 3.2v so that's enough I think those resisters are a bit cruddy so there going to get changed out all in all I think this will do for the 3-6 v range but no neg volts but I'm not worried about that for now the pot has to be extended out of course as well as the led and the addition of a volt meter is needed also the npn transistor is getting hot that's why I put it on the heat sink but still very hot so extend it onto a bb heat sink but I'm happy now for the schematic of all this
rdl:
As long as you use transformers for the two 12 volt supplies, separate is better because it's more versatile. They could even be adjustable. Make something like this, with a 3.3 volt supply added, and you'll have almost everything covered.
glinjik:
thats kinda what im aiming at just trying to find a way to neg volts from the smps
glinjik:
had a little test of the smps voltage runs 3.21v to 6.17 and 1,21a i put a 15w resister across it for amps
Neomys Sapiens:
--- Quote from: rstofer on January 13, 2020, 08:51:18 pm ---
--- Quote from: rdl on January 13, 2020, 06:49:31 pm ---There's at least one commercial product that does this, but the voltages are selected in 1.5 volt increments to match batteries, so not as useful as it could be.
You could use a single LM317 and switch between various resistors electronically or with a mechanical switch.
edit: Found one
https://www.amazon.com/Philmore-Multi-Voltage-Regulated-Power-Supply/dp/B004M45MHQ
--- End quote ---
The voltage selections are not useful (other than maybe 12V):
--- Quote ---Multi-Voltage Output: 3 , 4.5, 6 , 7.5, 9 , 12 VD
--- End quote ---
--- End quote ---
Depends on the task at hand. When doing repairs, I would find those voltage selections very useful, as they correspond to widely used battery combinations.
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