[sdiy] electrolytic coupling capacitors

[harrybissell]

I'd go for... if you don't know what the applied DC voltage might be (and this
goes
50x for any DIY synth...)  you should be prepared by using a non-polar (film,
or lytic) capacitor.

Its not that much more money, and its cheap insurance !!!

H^) harry

Samuel Morse wrote:

> I think equal voltages on either side of the coupling capacitor should be
> fine. A well designed IC should have good input and output isolation so you
> shouldn't have to worry about those circuits.
>
> -Sam
>
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Peter Blackett
> Sent: Sunday, October 31, 2004 3:11 PM
> To: synth diy list
> Subject: Re: [sdiy] electrolytic coupling capacitors
>
> Dear List ,
> just a quick question with regard to coupling caps.
> what do you do when the voltage on either side of the caps is roughly
> the same ?
> is it beter to arrange for there to be a small amount of offset on the
> output on the op amp side of the coupling cap, or not. ?
> it is well worth having coupling caps on the inputs of amps/mixers.
> as you never know what circuits might put dc on the input !
> regards Peter
>
>      Theo wrote:
> > Look at the level of the "internal" reference voltage and assume the
> > "outside" reference voltage to be 0V.
> > Now mount the caps so that they are polarized correctly based on the
> > reference voltages.
> > BTW Usually this means the positive side looks at the circuit.
> >
> > HTH
> > Theo
> >