[sdiy] Linear PSU Power Sequencing Issue

[Florian Anwander]

The ugly part here is: when you design a powersupply, you usually know 
what it should drive. But in the case of a modular system like our 
synths anything is possible. So you should design the various parts of 
the supply as independent as possible. A separate transformer may be too 
much effort (and weight), but again I think that the Doepfer PSU-3 uses 
a very nice solution: the +5V are provided directly from a separate 
small switching supply.

Florian


Am 31.10.2019 um 13:57 schrieb ackolonges fds:
> Aha!
>
> Thanks so much for the insight Florian and Tom, that makes perfect 
> sense. I suppose then, that I should try things like reducing the bulk 
> capacitance on the +5V line when it's derived from the +12V (and keep 
> the bulk capacitance if I'm supplying the +5V line separately), or try 
> putting a low value, high current series resistor between the +12V and 
> +5V supplies to limit the in-rush current.
>
> Of course these two potential solutions involve less ripple rejection, 
> or some power wastage, so if anyone else has any other ideas, please 
> feel free to pipe up 🙂
>
> Thanks again.
>

-- 
http://www.florian-anwander.de