[sdiy] Quick and Easy Power Question

[ColinMuirDorward]

The more power you are drawing, the more ripple-filtering capacitance
you'll need.
I'm not sure about the math, but you can imagine that when the ac is
swinging below 12v, then it's the caps that are feeding your 12v regulator.
The more current the regulator is drawing, the quicker the cap will drain
down to whatever voltage the AC swing is at at that moment.
Someone please correct me if I'm way off the mark!
C


On Sun, Nov 1, 2020 at 5:06 PM Shawn Rakestraw <shawnrakestraw at gmail.com>
wrote:

> 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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