[sdiy] Linear PSU Power Sequencing Issue

Quincas Moreira quincas at gmail.com
Thu Oct 31 22:46:23 CET 2019


Jason you need a bigger transformer. 15v -tap - 15v I would recommend for a Euro supply

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> On Oct 31, 2019, at 07:18, Florian Anwander <fanwander at mnet-online.de> wrote:
> 
> 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
> 
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