[sdiy] Module power - regulated or filtered (passively)?

[ColinMuirDorward]

Maybe this is a good place to ask: When people recommend getting those
100nf power filtering caps *near* the chip, how near are we talking? I
usually work to make sure they are the closest thing to the chip, but maybe
this is overkill. Any rules of thumb here?

As an aside, re regulating the power down for a 3340 chip, I'd just like to
comment that when you drop it to 10v, instead of 12v, I noticed that it
tidies up the output levels and becomes a bit easier to derive your 5v p-p
outputs.

Thanks,
Colin

On Mon, Jan 6, 2020 at 8:03 AM Florian Anwander <fanwander at mnet-online.de>
wrote:

> Hi
>
> Am 06.01.20 um 10:16 schrieb ShedSynth:
> > One issue I struggled with: the regulated supply has some resistance so
> a few milliamps drawn by the flashing LEDs causes fluctuations of a few
> millivolts on the +12V rail,
> If I remember right, then the solution is not to drive the LED directly,
> but to switch a bypass around the LED with an transistor, so the current
> is drawn always, but it is running either through the LED or through the
> transistor. You may have a look at the schematic of the Roland SH-101,
> how they do it there.
>
> FLorian
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