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

[Pete Hartman]

As near to the filtered rail input as physically possible.  For op amps I
typically try to  put them at the top and bottom of the chips, which is a
pretty common approach I've seen elsewhere also.  For the quad op amps,
sometimes I'll put them next to the power pins, but more commonly I do
still have them at the head & tail.

On Mon, Jan 6, 2020 at 10:54 AM ColinMuirDorward <colindorward at gmail.com>
wrote:

> 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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>
>
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