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

[Ingo Debus]

> Am 27.12.2020 um 22:58 schrieb Florian Anwander <fanwander at mnet-online.de>:
> 
> 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.

Why 7805? Can’t you use the LM1117 regulator on the Arduino Nano?

Ingo