Extreme noob electronic question

[Marc Nostromo [M-.-n]]

Thanks. So I'll go for it with the polarized caps.

> in an analogue circuit, you can let it go negative sometimes, but only
> if either a) you are bad at circuit design or b) you like your filters
> sounding rough

Sounds like I'm at a point in my life where both conditions are satisfied :)

I'll be happy the day I'll look at the AFM/Shruthi schematics and go
'haaa that's what they do'... maybe in a couple of years. That shit is
rough !

2013/1/18 Tony Hardie-Bick <tony at entity.net>:
> On 18/01/13 14:03, Marc Nostromo [M-.-n] wrote:
>>
>> I'm still slightly confused between polarized versus non polarised
>> capacitors :)
>>
>> I'm going to need a voltage regulator to bring down 9v to 5v with a
>> LM7805 using this rough schematics
>>
>> http://snesdev.antihero.org/wp-content/uploads/2008/03/lm7805.gif
>>
>> I undestand the capacitors are used to stabilize the ac changes in the
>> DC supply. Does that mean I can't use polarised caps ?
>>
>> Because my impression is that the voltage will no matter what be
>> higher than the ground so polarity should not get in the way.
>
>
> yeah - your understanding is correct.
>
> an electrolytic (polarised) capacitor requires a certain amount of
> voltage across it so its internal insulating layer remains intact. If
> you reverse the polarity, this layer gets eroded, and the thing starts
> conducting. So, as long as you have correct polarity, and preferably
> some voltage, then it's okay.
>
> in an analogue circuit, you can let it go negative sometimes, but only
> if either a) you are bad at circuit design or b) you like your filters
> sounding rough
>
> lol
>
> Tony (HB)
>
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