[sdiy] Opionions on Switchmode PSUs for analog synths?
metadata at gmx.com
Thu Nov 7 03:52:22 CET 2019
On 10/30/19 5:48 PM, Ben Stuyts wrote:
> Hi Neil,
> Depends if you can tolerate the noise. I’ve used quite a few products
> from Mean Well, and although their price if very good, their noise and
> EMC performance is terrible.
> There is orders of magnitude in difference in noise between these kinds
> of DC/DC converters and a good low-drop-out analog regulator. I’m
> currently looking at a LT3088 LDO (3-pin, needs one ext resistor to set
> output voltage) at
> https://www.analog.com/en/products/lt3088.html#product-overview. It has
> 27 uV RMS noise. The Mean Well has 3 orders of magnitude more. So if you
> have the budget, go for some SMPS to generate pos and neg and followed
> with some analog regulators. Maybe even put a point-of-load regulator on
> each board.
> BTW, do you have to use a wallwart? Regular transformers are plentiful.
> On the other hand, there were similar awful DC/DC converters in Buchla
> 200e boats and nobody complained…
hey ben, thanks for the reply..
that LT3088 looks really interesting.. 800mA, but in a very tiny package
like that.. what's going on? My LM317/LM337 stuff gets very hot even
with a modest current draw. Are these doing something fancier inside
than just the 'convert excess voltage to heat' that i'm used to
the general consensus does seem to be follow up a SMPS with very good
linear regulators.. thank you.
as for not using a transformer, i don't want to deal with mains-level
/// Neil Harper
/// Every Wave is New Until it Breaks
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