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<p>Hi Shawn,</p>
<p>You'll be perfectly fine with the two PSUs sharing the 24VCT
transformer, as long as both PSUs share the same GND.<br>
</p>
<p>For the input filter caps, personally I'd go with 4700µF or more
to be safe on ripple.</p>
<p>- Oren<br>
</p>
<div class="moz-cite-prefix">On 11/1/20 7:03 PM, Shawn Rakestraw
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+-UNiD5R-HuoP0eVynkZVgzieZbsLVs7CDfxXiWy8P3OABjHw@mail.gmail.com">
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<div>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.<br>
</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>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?<br>
</div>
<div><br>
</div>
<div>
<div><img src="cid:part1.A973F8DE.4813C6DC@ix.netcom.com"
alt="psu.png" style="margin-right: 0px;" class=""><br>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Nov 1, 2020 at 7:16 PM
Ben Stuyts <<a href="mailto:ben@stuyts.nl"
moz-do-not-send="true">ben@stuyts.nl</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
> On 2 Nov 2020, at 00:49, Shawn Rakestraw <<a
href="mailto:shawnrakestraw@gmail.com" target="_blank"
moz-do-not-send="true">shawnrakestraw@gmail.com</a>>
wrote:<br>
> <br>
> 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?<br>
<br>
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.<br>
<br>
Ben<br>
<br>
</blockquote>
</div>
<br>
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