[sdiy] Quick and Easy Power Question

[Tom Bugs]

PS - how are you loading to test? Using calculated power resistors 
should be the approach, rather than using modules.
Proper testing is everything - yes, it all seems simple/easy but the 
devil is always in the detail ;)

On 02/11/2020 12:49, Roman Sowa wrote:
> 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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