[sdiy] get 5V from 12V - DC-DC converter or 7805?

[ColinMuirDorward]

I have nothing to add about the power, but I do want to say that I miss the
old jx3p sequencer!
Sounds like a great module :)
Colin

On Sun, Dec 27, 2020 at 3:05 PM Christian Maniewski via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Hey Florian,
>
> I can also vouch for the Recom R-78x series, I’ve been using them in quite
> some prototypes already. For one of the latest projects, a 5V Doepfer PSU
> rail adapter (KiCad design here:
> https://github.com/soundslikefrank/gimme_five) I used the MP2359, whose
> advantage is that it’s quite cheap compared to the Recom converters, but
> you have to add some more additional components to it (for example to set
> the output voltage). For some reason, it’s ridiculously cheap on JLCPCB
> assembly right now (~20cents) which is the reason I went for it. For
> one-off prototypes which are not super power hungry (<=500mA) the Recom
> should be a really good choice though!
>
>
> Cheers,
>
> Chris
>
>
> On Sunday, Dec 27, 2020 at 11:04 PM, Florian Anwander <
> fanwander at mnet-online.de> wrote:
> Hello,
>
> I am at designing the pcb for a simple  MIDI-sequencer based on an
> arduino nano (the basic idea is derived from the JX-3P / SH-101
> sequencer). I want to build it as a euro rack module, but want to have
> it also as standalone unit. So the pcb has the usual eurorack power
> connector and a socket for a wall wart. I have jumpers to select between
> 5V from the euro rack connector, or 5V from a regulator which is fed
> either by the 12V from the eurorack connector or by 9V-12V from a wall
> wart.
>
> At the moment I implemented the 5V conversion with a 7805. But I think
> this will cause a lot of "useless" current on the 12V rail of the euro
> rack. I thought about one of these DC-DC converters, but I am not sure
> how much (switching-)noise those can insert into the euro racks supply
> and ground. The module also has voltage inputs (for note length and
> velocity) and trigger/gate inputs, so electric relations with ground to
> other modules or external devices are quite likely, and I fear I
> transfer potential supply noise this way in the external signal paths.
>
> On the other hand the 7805 circuit is quite easy to implement, the DC-DC
> converter has to be bought as module or requires buying parts I won't
> have use for anywhere else.
>
> Does anyone have experience with those DC-DC converters?
>
>
> Regards
> Florian
>
> --
> http://www.florian-anwander.de/
>
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