[sdiy] Switched-mode power supply module in synths... good or bad?

[Paul Maddox]

I used a switch mode power supply in the Monowave, worked well for me.
I was careful to make sure I picked one with a very high switching frequency (IIRC, the one in the Monowave was around 1Mhz).
Ripple wise, I didn't notice any, IMHO, it was more stable than most analogue power supplies I'd seen in a long time.
It was also a LOT lighter and cheaper.

Paul

On 25 Jan 2012, at 20:04, Mattias Rickardsson wrote:

> Some PSU thoughts.
> 
> In order to minimize the size (and heat) of the JH Living Vocoder,
> ( http://www.jhaible.de/vocoder/living_vocoder.html )
> I'm considering the possibility of using a switched-mode power supply
> instead of a transformer. Something like these devices:
> 
>  http://www.tracopower.com/products/ac-dc-power-supplies/encapsulated-modules/
> 
> It would then probably be a +/-15 V supply, regulated down to +/-12 V
> with the linear regulators on the Living Vocoder pcb in order to get
> rid of the switch ripple. I expect the ripple (on the order of 100 mV)
> would be way too strong to use directly. The supply would sit
> physically very near the vocoder circuitry though, practically on the
> free lab area in the corner of the pcb.
> 
> Can anybody recommend for or against such switching supplies with
> analogue audio? Would it be a sensible idea at all, or would I regret
> that I tried?
> 
> /mr
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