Electronics > Beginners
Discrete Regulated power supply
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HoracioDos:
While looking for PSU circuits with passive components I found this one.

from
https://www.homemade-circuits.com/how-to-make-versatile-variable-voltage/
It's a simplified version of a previous one. I liked this site very much.

PS: I guess it can be mirrored like this one to get positive and negative voltage.
https://www.homemade-circuits.com/0-to-50v-0-to10amp-variable-dual-power/
Is there any policy about linking content between sites?

HoracioDos:
Here is Ltspice model for Nuno PSU. Voltage output raises very slow and there's no ripple. It will take me a while to understand how the BJT network works in both circuits and how to choose different kind of loads in ltspice. I found Kicad schematics and PCB for this one.

PS: if someone arrives to an improved and working version, please post it here.
not1xor1:

--- Quote from: HoracioDos on June 26, 2018, 12:35:24 am ---While looking for PSU circuits with passive components I found this one.

from
https://www.homemade-circuits.com/how-to-make-versatile-variable-voltage/
It's a simplified version of a previous one. I liked this site very much.

PS: I guess it can be mirrored like this one to get positive and negative voltage.
https://www.homemade-circuits.com/0-to-50v-0-to10amp-variable-dual-power/
Is there any policy about linking content between sites?

--- End quote ---

ROTFL
"Ripple free, with less than 1Vpp"  :o
and 0-100V  with a 2N3055?  |O
and just Vbe as V reference...   :palm:

that would have been a really bad project even 50-60 years ago
now there are no excuse for such rubbish  :--

just forget it
HoracioDos:

--- Quote from: not1xor1 on June 26, 2018, 04:02:41 pm ---ROTFL
"Ripple free, with less than 1Vpp"  :o
and 0-100V  with a 2N3055?  |O
and just Vbe as V reference...   :palm:
that would have been a really bad project even 50-60 years ago
now there are no excuse for such rubbish  :--
just forget it

--- End quote ---
I see. I still don't have the skills to spot these things. Internet fooled me again, but it makes me wonder what I did wrong because I didn't see the ripple. I will check it again.
blackdog:
Hi,

All i see is schematics who do not care about phase marging...
Like the schematic with 1000uF at the output, this must be a joke...  |O

Power supply's are not simpel!
Can you build a good powersupply with discrete components, yes!, but you need to follow the same rules as with a opamp power supply.

Anyone who wants to build power supply will have to learn what phase margin and gain margin is.
And do dynamic testing. :-)

Kind regard,
Blackdog
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