ODP: AC-coupling of pulse wave?

[Roman Sowa]

That's the dilema I had to cope with, when I decided what
waveforms I want for my VCO. Here's what I did:

There's a pulse waveform 0-5V not intended for audio
but modulation, so DC is welcome here
there's also bipolar pulse produced by comparators
fed with triangle and saw. This waveform has 0 DC componnent.
There is also DC cancelled PWM sine wave most relevant
to your question.
take a look at http://www.multimania.com/romcio/selector.gif

Add pulse wave and the PW voltage in such amount
and polarity, so DC will cancel in PWM output.

Roman

> -----Oryginalna wiadomość-----
> Od:	jorgen.bergfors at idg.se [SMTP:jorgen.bergfors at idg.se]
> Wysłano:	26 marca 1999 11:18
> Do:	synth-diy at mailhost.bpa.nl
> Temat:	AC-coupling of pulse wave?
> 
> Hi all.
> 
> Should the pulse wave be AC or DC-coupled in the VCO? When you change the
> pulse width, the DC-level will change. The narrower the pulse, the more
> DC. If you DC-couple it, you will get pops if you patch it into a VCA,
> that is controlled by a quick attack. But if you AC-couple it, you will
> still get pops if you have a step in the pulse width modulation.
> Any solutions?
> 
> /Joregn