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

Mike Bryant mbryant at futurehorizons.com
Sun Dec 27 23:09:35 CET 2020

You could try one of these as they are pin-compatible with the 7805


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Florian Anwander
Sent: 27 December 2020 21:58
To: synth-diy at synth-diy.org
Subject: [sdiy] get 5V from 12V - DC-DC converter or 7805?


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?



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