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<p>Are you sure you don't have a short on one of the power rails?
(eg a screw came loose & is shorting something)</p>
<p>This pulsing suggests the DCDC is trying & failing to start
up.</p>
<p>Did you do a continuity check between the rails? (there shouldn't
be continuity between them)<br>
</p>
<div class="moz-cite-prefix">On 01/11/2022 20:24, Didier Leplae via
Synth-diy wrote:<br>
</div>
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cite="mid:5816757E-77FA-47D3-BC68-CC673E9F20B1@yahoo.com">
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<div dir="ltr">Hmm, that’s interesting. I’ll think if there’s some
way I can do that. I have very limited equipment with me</div>
<div dir="ltr"><br>
<blockquote type="cite">On Nov 1, 2022, at 8:17 PM, Mike Bryant
<a class="moz-txt-link-rfc2396E" href="mailto:mbryant@futurehorizons.com"><mbryant@futurehorizons.com></a> wrote:<br>
<br>
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charset=UTF-8">
<div style="font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"
class="elementToProof">
Yes that fits. Can you put a bit more load on it ? A
laptop in parallel perhaps ?<br>
</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
Didier Leplae <a class="moz-txt-link-rfc2396E" href="mailto:didierleplae@yahoo.com"><didierleplae@yahoo.com></a><br>
<b>Sent:</b> 01 November 2022 20:08<br>
<b>To:</b> Mike Bryant <a class="moz-txt-link-rfc2396E" href="mailto:mbryant@futurehorizons.com"><mbryant@futurehorizons.com></a><br>
<b>Cc:</b> Gerry Murray <a class="moz-txt-link-rfc2396E" href="mailto:synthimuse@gmail.com"><synthimuse@gmail.com></a>;
<a class="moz-txt-link-abbreviated" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:Synth-diy@synth-diy.org"><Synth-diy@synth-diy.org></a><br>
<b>Subject:</b> Re: [sdiy] Powering 4ms pod</font>
<div> </div>
</div>
<div dir="auto">
<div dir="ltr">I’d say the time interval is almost exactly 1
sec</div>
<div dir="ltr"><br>
<blockquote type="cite">On Nov 1, 2022, at 7:38 PM, Mike
Bryant <a class="moz-txt-link-rfc2396E" href="mailto:mbryant@futurehorizons.com"><mbryant@futurehorizons.com></a> wrote:<br>
<br>
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<div dir="ltr">
<div class="x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
Pure guess but some laptop supplies require a minimum
current draw. If not, they power up, find there isn't
enough draw then turn off and try again. What time
interval are we talking about ?</div>
<div class="x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class="x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>From:</b> Synth-diy
<a class="moz-txt-link-rfc2396E" href="mailto:synth-diy-bounces@synth-diy.org"><synth-diy-bounces@synth-diy.org></a> on behalf of
Didier Leplae via Synth-diy
<a class="moz-txt-link-rfc2396E" href="mailto:synth-diy@synth-diy.org"><synth-diy@synth-diy.org></a><br>
<b>Sent:</b> 01 November 2022 18:48<br>
<b>To:</b> Gerry Murray <a class="moz-txt-link-rfc2396E" href="mailto:synthimuse@gmail.com"><synthimuse@gmail.com></a><br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:Synth-diy@synth-diy.org"><Synth-diy@synth-diy.org></a><br>
<b>Subject:</b> Re: [sdiy] Powering 4ms pod</font>
<div> </div>
</div>
<div class="x_BodyFragment"><font size="2"><span
style="font-size:11pt">
<div class="x_PlainText">I did check contact
between the leads on the back of the tip and the
contacts where the power jack are soldered
inside the 4ms pod with my multimeter continuity
setting and it seems to be making a connection.
Maybe the 0.4mm difference is negligible?<br>
Also, the on and off isn’t random like a bad
connection, but very regular.<br>
<br>
Does this “motor boating” idea make sense? It is
a 90w power supply and the 4ms requires minimum
20w<br>
<br>
<br>
> On Nov 1, 2022, at 4:42 PM, Gerry Murray
via Synth-diy <a class="moz-txt-link-rfc2396E" href="mailto:synth-diy@synth-diy.org"><synth-diy@synth-diy.org></a>
wrote:<br>
> <br>
> Assuming you're able to get the plug to
make a temporary contact, it could be the supply
is underrated for the turn-on surge of the 4mS
pod.<br>
> Seems like it might be 'motor boating'.<br>
> Power comes on, post-regulator caps draw
current, external supply collapses, regulator
turns off, supply recovers. Repeat.<br>
> Just a possibility.<br>
> Gerry<br>
> <br>
>> On 01/11/2022 16:28, Neil Johnson via
Synth-diy wrote:<br>
>> HI,<br>
>> <br>
>> Didier Leplaewrote:<br>
>>> I went to a local electronics store
and bought a sort of universal supply. (The
brand is “Classic” and model# PSE50249)<br>
>>> It has a tip which seems to fit,
but says it is “5.5/2.5mm, 12mm”.<br>
>>> When I plug it in to the 4ms pod,
the power flashes on and off, every second or
so, even with no modules or ribbon cables
attached.<br>
>>> Testing the supply with a
voltmeter, it is indeed positive tip and around
19.5V.<br>
>> Is it something like this:<br>
>> <a
href="https://www.csi-elektronik.de/PSE50249-EU-Universal-Netzteil-90W-11-ADAPTER-185-20V-45A-90W-C6"
moz-do-not-send="true"
class="moz-txt-link-freetext">
https://www.csi-elektronik.de/PSE50249-EU-Universal-Netzteil-90W-11-ADAPTER-185-20V-45A-90W-C6</a><br>
>> <br>
>> If so choose the correct tip as Steve
suggested.<br>
>> <br>
>> Neil<br>
>> <br>
>>
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