[sdiy] Quick and Easy Power Question

[Shawn Rakestraw]

Here is the circuit for the PSU. You guys / gals helped me iron this one
out almost a year ago. This schematic is for 1 amp on the +12 and -12, but
I have built a couple now with 2 amps on the +12 and it does not get too
hot for the regulator. The transformer would be your standard cube shaped
iron core center tap transformer (120V to 24V). Circuit is based on
Electronotes.

My main concern was that I want to have 2 of these psu boards off a single
transformer. I suppose I could also have a transformer for each psu board
and just split the mains before the transformers too.

As long as I am posting the circuit, I will ask one more question. This
one, much more generalized. My filter caps are only 1000 uF and the circuit
seems to work perfectly fine. I see others using an outrageous number of
caps in parallel with much higher values. Is this advantageous or is it
pure overkill and bordering on being a problem due to not fully charging
the caps?

[image: psu.png]

On Sun, Nov 1, 2020 at 7:16 PM Ben Stuyts <ben at stuyts.nl> wrote:

>
> > On 2 Nov 2020, at 00:49, Shawn Rakestraw <shawnrakestraw at gmail.com>
> wrote:
> >
> > If I use a transformer that is say 24V and 6 amps, can I connect 2 of my
> power supply boards to that transformer? There's nothing wrong with that,
> right?
>
> Hard to say without any additional info. It really depends on the topology
> of the power supply. For example, if you have a single wave rectifier on
> the input of the psu, and you have connected both psu’s in reverse, you
> will probably short-circuit your transformer.
>
> Ben
>
>
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