Extreme noob electronic question

[Marc Nostromo [M-.-n]]

Right now I'm trying to do a Jurgen Haible wasp filter clone. I choose
that one because the schematics where easy to find, it runs from 5v
and has filter CV so I can learn about ota's too. I can also think of
hooking it to an arduino or a teensy as mcu and have a small
digital/analog thing to play with.

The reason I want the regulator is that I have also built a small
measuring buffer circuit that I can hook my soundcard to and use it as
a cheap scope (not for precise measure but for shape already it hels)

However that one doesn't run properly on 5V DC on the whole audio
range (it 'clips' wierdly, I guess because the op-amp there act
strange when you get close to the rails) and so I need to power it
from 9V and need a 9V->5V regulator for the filter. So I'm planning on
powering the whole thing from 9V and get a 5V voltage out of that.
Note that in any case, anything I do right now will possibly fail but
teach me something.

I've got millions of things I want to try after :)

/M

I also want

2013/1/18 Paul Maddox <yo at vacoloco.net>:
> As tony says, it's good practice to do both.
> One of the main reasons is that every component includes an element of
> resistance, all be it small.
> so whilst in theory a 220uF should cover every from quite low frequency to
> very high, in practice it won't. So you'll often see a 100nF and a something
> between 50uF and 220uF to make sure the 5V line is as stable as possible.
>
> You could use almost any value you wanted, but 100nF is a bog standard value
> available anywhere in almost any pin format and it's widely considered the
> defacto standard for decoupling (the practice of shorting HF to ground and
> stabalising a power rail).
> it's good engineering to do what you can to keep things stable, and 100uF
> (or 220uF) caps are only a few pennys and can save a lot of hassle with
> debugging a circuit which has a 5V rail that's jumping around like a mad
> thing :)
>
> What you building?
>
> Paul
>
> On 18 January 2013 15:47, Tony Hardie-Bick <tony at entity.net> wrote:
>>
>> On 18/01/13 15:17, Marc Nostromo [M-.-n] wrote:
>>>
>>> While I'm digging the subject, why is there a 100n and a 220u
>>> condenser next to each other in  Olivier's 'Mutable' regulators.
>>
>>
>> this is down to the imperfections of real world capacitors. generally,
>> the bigger they are, the more inductance they have, which prevents them
>> from smoothing especially fast transients (like the transistor switching
>> Paul mentioned), so a common solution is to put a high value and a low
>> value right next to each other. In a microprocessor circuit, you might
>> know that all the switching is the instantaneous stuff, like zero to 5V
>> in 25nS etc, which only a small capacitor can deal with, and in fact,
>> the microcontroller usually has some fairly tight specifications for
>> placing such a capacitor nearby, and, if you're really pushing it,
>> specifically what make and model of capacitor you can use (most extreme
>> examples being switched mode inverters).
>>
>> fun fun fun....
>>
>> actually, electrolytic capacitors are an awesome example of applied
>> nanotech,
>> although nobody ever calls it that. manufacture involves creating an
>> insulator
>> a few atoms thick, by passing a current through the structure. As the
>> insulator
>> grows, it leaves gaps which attract more of the current, so these get
>> filled in
>> while the existing insulator fails to grow any thicker. amazing, but i
>> digress...
>>
>> Tony (HB)
>>
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>
>
>
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