[sdiy] BBD help

[Shokwave]

----- Original Message ----- 
From: "harrybissell" <harrybissell at prodigy.net>


> OK now lets get serious...

I knew, if I stated my cluelessness clearly enough, you guys would come to
my rescue and show me why I was clueless. Wonderful list.

> The delay in the amp and cord may be disregarded for all intents and
purposes...
> if you
> want to simulat the delay in a amp, especially a tube amp with little
negative
> feedback...
> probably a simple RC filter would give you 'that' much delay.
>
> More important is the speed of sound in air... roughly 1.1' per ms.
>
> The feedback from the amp to the body / strings is much more a function of
the
> coupling
> as you noted.

Thank you.

> What might suit your fancy even nore would be a number of bandpass
filters,
> closely
> spaced. They have done these as resonators to simulate strings, voices,
etc.
> When you
> put a guitar through them, feedback becomes almost inevitable.

Anyone know of an example of this? I'd rather not use lm13600's up in this
application...the simplest way I can think of is some biquad filters, made
from 3 opamp sections, 6 resistors and two caps, ala
http://www.geocities.com/icdx_australia/audio_bandpass_filter.htm (halfway
down the page).

> I've gotten a really good guitar feedback simulation with a MutronIII
(envelope
> follower)
> set to High range, sweep down... in front of a BigMuff II fuzz.   It seems
that
> as soon as
> the follower sweeps past the actual string, the resonance locks it in
place
> pretty well.  Gets
> that Jimi Hendrix sound for people who (like me) really can't play quite
that
> well... ok can't
> play within three orders of magnitude that well...

Hmm. Ever run anything other than a guitar through a similar setup?

> ns delays could be just sending the signal through an opamp buffer. ns is
WAY
> too short to get an effect.

Thanks. I was just pulling numbers out of my...er, TX-1. Yeah, that's it.

Thank you, and all the others who have helped out. I'm off to see if the
local library can exchange "Basic Electronic Theory" for "The Art of
Electronics".

-Darren