[sdiy] Quick and Easy Power Question

[Roman Sowa]

It doesn't get "too hot" most probably because at 2 Amps your 1000uF 
capacitors are drained to couple of volts, way below 12V, on each mains 
cycle.
Hook up a scope at those caps and check.

Roman

W dniu 2020-11-02 o 02:03, Shawn Rakestraw pisze:
> 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?
> 
> psu.png
> 
> On Sun, Nov 1, 2020 at 7:16 PM Ben Stuyts <ben at stuyts.nl 
> <mailto:ben at stuyts.nl>> wrote:
> 
> 
>      > On 2 Nov 2020, at 00:49, Shawn Rakestraw
>     <shawnrakestraw at gmail.com <mailto: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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