[sdiy] Quick and Easy Power Question

[S Ridley]

You might want to look at upgrading the 1N4002s for something with a higher
current rating, particularly if you're drawing 2A and thinking about bigger
reservoir caps.
4002 absolute max rating says average rectified current 1A (this may vary
with make).

Steve




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On Mon, 2 Nov 2020 at 01:05, 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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