[sdiy] Opinions on Switchmode PSUs for analog synths?

[Ben Barwise]

Apart from ripple, a small problem I have found with DC/DC converters is
that there is a maximum capacitive load. Correct me if I am wrong but I
think what tends to happen is it trips the short circuit protection when
the module is powering up because of the inrush current. I have seen them
get stuck in a hiccup like loop (this was in a non synth project with a lot
of caps!). Could be an issue if you are powering a lot of mixed modules in
a modular. For example the ECLB40W-24D12 has maximum 1650μF load, that's
quite generous, but its a spec to watch out for.

On Fri, 8 Nov 2019 at 11:55, mark verbos <markverbos at gmail.com> wrote:

> I put a regulator diode on the input side, to protect against reverse
> voltage frying it, but I’m not sure if that is necessary. The “15 VDC”
> comes in on a 2.1mm barrel connector from an external brick. It goes
> through a switch, a diode and a cap to ground before the DC-DC converter.
> The advantage is that it is 90% efficient, weighs less, can be plugged in
> anywhere in the world without a converter, doesn’t get hot, hardly takes up
> any space, maybe more….
>
> I had to replace the transformer in a TR-909 this year because someone
> plugged a Japanese one into a European outlet. Inside, it’s just a jumper
> to change it, but the owner didn’t know that. It makes me wonder if
> replacing the transformer with a SMPS would be a better solution. I didn’t,
> but I wonder.
>
> Mark
>
>
>
>
>
> > On Nov 8, 2019, at 6:00 AM, Michael Zacherl <sdiy-mz01 at blauwurf.info>
> wrote:
> >
> >
> >> On 7 Nov 2019, at 12:51, mark verbos <markverbos at gmail.com> wrote:
> >>
> >> I use the ECLB40W-24D12 which is a 40W metal can one. It will take
> pretty much any DC you throw at it (9V-36V per the datasheet). I put some
> big caps to ground on the output of them.
> >
> >
> > Hi Mark, so, how does your input side look like?
> > ATM that implementation appears like the (aforementioned) hybrid version
> to me where I can’t really see its advantage over a linear PSU. Only
> reason, maybe, I can’t find a +/- SMPSU using mains voltage?
> > m.
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