[sdiy] Kraakdoos line out

[rkmoore at memphis.edu]

Hi CJ,

On mine I used a voltage divider to attenuate the voltage and then a
capcitor in series with the output to block DC.  I just played with the
values until I got something acceptable.  I think I used a large-ish cap
(a few microfarads).  I would try to keep the resistor values in the
divider small to avoid unwanted high pass filtering.  Again, I'm kind of
new with stuff, so my advice may be flaky.

Richard Moore

----- Original Message -----
From: Metrophage <c0r3dump23 at yahoo.com>
Date: Sunday, May 15, 2005 9:48 am
Subject: Re: [sdiy] Kraakdoos line out

> Hi Ian!
> 
> 1. Because, as I mentioned, I am doing something else.
> 2. Because I don't know any better! I started backwards, just 
> trying to
> copy schematics into working synth modules. Only recently have I begun
> to be interested in the fundamentals of electronics, so, I am 
> still a
> bit on the ignorant side.
> 
> I have thought about making a voltage divider, presumably at the 
> op-amp
> output, before the transistor amplification. My concern is whether or
> not reducing the voltage will remove DC components from the 
> signal. I
> guess this would be obvious to others who are more experienced. Also,
> the Kraakdoos circuitry is very sensitive - even adding a volume 
> pot to
> the speaker I had to try quite a few things, as I was causing the
> circuit to cease oscillating. Probably not so much an issue with most
> audio circuits, which are designed to not be so flaky.
> 
> Again, I will try soon! Don't feel badly about beating me there,
> Rafael!
> 
> CJ
> 
> --- Ian Fritz <ijfritz at earthlink.net> wrote:
> > At 02:55 PM 5/14/05, Metrophage wrote:
> > >I don't know, I am trying to get a few other projects off of my
> > bench
> > >now. Don't know when I will try to do the output. Soon, I hope!
> > >
> > >CJ
> > 
> > 
> > Am I missing something?  Why can't you make a line out in the usual
> > way by 
> > hanging a voltage divider off the opamp output? 
> > 
> > 
> 
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