[sdiy] Powering 4ms pod

[Doug Jackson]

Hi Everybody,

I have a Pod20 from 4ms, and just looked at it.

[image: image.png]

1.  The pod fires up just fine with no load - The 3 Leds on the board all
glow merrily
2.  It requires 12V with a centre positive plug
3.  The PSU is really nice - there are a couple of buck switching
regulators onboard to do the 5v +/1 12 conversion / regulation.

[image: image.png]
If your supply is pulsing on/off then it is going into overload, switching
off, and trying to restart again - This says that whatever its loading up
is shorted.

Is the pulsing a LED on the PSU itself?  Does it stay lit when the PSU is
not plugged into the pod.

In the case of the Pod20, D1 is a series diode that protects the module
from reverse polarity, so if the supplies are the same, you have not likely
damaged it with reverse polarity.

My forecast is that one of the buck converters has reverted to silicon -
remove them one at a time till the stort goes away.

Kindest regards,

Doug Jackson

em: doug at doughq.com
ph: 0414 986878

Check out my awesome clocks at www.dougswordclocks.com
Follow my amateur radio adventures at vk1zdj.net

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On Fri, 11 Nov 2022 at 10:56, Jay Schwichtenberg via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Some power supplies need a load before they function properly. So you
> might try that on the +/-12 and +5 if available.
>
> Jay S.
>
> On 11/10/2022 1:45 PM, Didier Leplae via Synth-diy wrote:
> > Ok, so now I got the actual 4ms power supply from Thomann and I am still
> having the same problem!
> > There are no modules or even ribbon cables plugged into the pod. The
> power flashes on and off. However, I didn’t measure this accurately, but
> using my «one-one thousand» method, I estimate it is flashing every two
> seconds and with the other power supply it was about every second.
> > The last power supply was 90W and this one is 45W.
> > I’m not sure if that is at all helpful to figure out what is going on.
> > I guess either the pod is defective or was damaged somehow, or the last
> power supply set off this problem?
> >
> > Any ideas?
> >
> >> On Nov 2, 2022, at 5:36 PM, Gerry Murray via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> >>
> >> :-)
> >>
> >>> On 02/11/2022 17:28, Didier Leplae wrote:
> >>> We’ll, I managed to return the power supply, so might never know why
> that didn’t work…
> >>>
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