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All about Linear Power Supplies
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queennikki1972:
I grounded to the case with the green wire and a lug under the circuit board
queennikki1972:

--- Quote from: MarkF on April 26, 2019, 01:29:20 am ---Welcome.
A couple circuits you might want to study.

   

   

--- End quote ---



I found the link to this circuit and reading a little. So although the LM317 is limited to 1.5 amps, this circuit allows for 5 amp constant current and variable as well? What size transformer and smoothing would be best suited to cover this also? If I had to guess on transformer I would say 12v-0-12v 5 amp ?

I have to admit although I could probably build this circuit , it will take me a minute to comprehend its entirety.
Mechatrommer:

--- Quote from: queennikki1972 on April 26, 2019, 10:34:51 pm ---I found the link to this circuit and reading a little. So although the LM317 is limited to 1.5 amps, this circuit allows for 5 amp constant current and variable as well?

--- End quote ---
yes. extra current will go through TIP3055 due to 22R and 4R77 voltage divider mechanism.


--- Quote from: queennikki1972 on April 26, 2019, 10:34:51 pm ---What size transformer and smoothing would be best suited to cover this also? If I had to guess on transformer I would say 12v-0-12v 5 amp ?

--- End quote ---
depends on what you want to do. it could be, it could be not. if you want PSU that goes to 30V on the output, then no.


--- Quote from: queennikki1972 on April 26, 2019, 10:34:51 pm ---I have to admit although I could probably build this circuit , it will take me a minute to comprehend its entirety.

--- End quote ---

--- Quote from: http://www.defprogramming.com/quotes-by/brian-w-kernighan/ ---Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.

--- End quote ---
another word... if you can read it in a minute, means you can build and debug it in 2 minutes... it could also means another ;) i have several psu projects that went under the shelve due to sub par performance based on eevblog community standard, hence they have to go behind the project/task queue, get used to it! if you think eevblog (electronics) is a friendly place fine, get deeper into the rabbit hole, there are wonderful things (not intending to demotivation) but... not with sitting on a "lazy chair" ;) cheers
queennikki1972:
Yes I would prefer the 30v output on the circuit if I built it.. As I understand it I would not want to go higher than the max input of 40 volts for the regulator (maybe that does not apply in this circuit I don't know) and that 12-0-12 or 24 volts is to low of an input for 30v output but a 24-0-24 or 48v transformer is to high.
MarkF:
I'm not sure which circuit you are looking at.  But...

* I don't think 30V is a big deal.  You probably won't ever need much over 24V.
* Having adjustable current limiting is a bigger deal.
* Hammond has many voltages to pick from if you need to buy a transformer (See attached).
* Looking at the 1st circuit, I'd try a LM358 opamp so you don't need a negative supply.  You would not be able to get completely to zero voltage.  Probably 1.5V as minimum.I have not built either circuit.  I don't know how they perform.  I have 4 of the little HP supplies that I posted the picture of.
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