[sdiy] lag processer

[Tim Parkhurst]

Hi Dustin,

Yep, pretty much all lag generator / slew / glide / portamento circuits act
like this. Basically, a lag gen is a circuit known as an "integrator." Take
a resistor, put it in series with your signal, and then add a capacitor to
ground and *viola*, you have your basic integrator. On top of that, you also
have a very simple low-pass filter. One cap and one R gets you a 6dB
response (which is why 24dB filters have four R/C 'integrator' sections).
I'm oversimplifying things a bit here, but do a little Google search on
Integrators or Low-Pass filters, or even check out some simple glide
circuits or AR type envelope generators and you'll see the basic r/c
integrator used over and over. You might also want to check out another
basic circuit known as a 'differentiator.' This is a cap in series with the
signal, and a resistor to ground, and forms the basis of a high-pass filter
(amongst other things).


Tim (my lag generator is set to maximum until about 10AM) Servo

"Imagination is more important than knowledge." - Albert Einstein

********************************
-----Original Message-----
From: dustin sedlacek [mailto:dustin.sedlacek at gmail.com] 
Sent: Monday, April 18, 2005 4:53 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] lag processer



i do not have a lag processor but i was playing with my roommates
moogerfooger CP-251 the lag processor is very odd, it acts as a filter a
envelope generator (if you use a pulse input) and with no gate  and just a
out put it has jumping voltages  that are somewhat tracking the rise and
fall knobs ,,,ok so this is a real mystery to me WTF is it ? i know that the
serge DUSG has similar behaviour  but do all lag processors act like this ? 


-
Dustin 
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