ISP Decimator G string  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

ISP Decimator G string  [traced]

Postby POTL » 13 Apr 2017, 21:58

This is vero schematic :D
I have 2 questions
1) DA 1.1 Whether it is an obligatory part of the circuit or just closes the second half of the chip
2) DA 2.2 The voltage divider is perfectly capable of operating without a chip, why is it here?
P.S.
JFET КП303А, D7,C12,R34,R42,LED,D11 Must be removed if you want true bypass.
You do not have the required permissions to view the files attached to this post.

For this message the author POTL has received thanks:
bmxguitarsbmx (15 Apr 2017, 00:10)
POTL
Solder Soldier
 
Posts: 221
Joined: 26 Sep 2016, 04:11
Has thanked: 46 times
Have thanks: 47 times

Re: ISP Decimator G string schematic

Postby alexradium » 15 Apr 2017, 08:43

these are normal textbook practices,just read one and you get it.
alexradium
Solder Soldier
 
Posts: 215
Joined: 31 Jan 2010, 14:31
Has thanked: 46 times
Have thanks: 37 times

Re: ISP Decimator G string

Postby bmxguitarsbmx » 15 Apr 2017, 19:42

You could probably get away without the DA 1.1 buffer.

I wouldn't advise simply using a resistive voltage divider + capacitor to establish a bias voltage for this circuit as the circuitry draws current asymmetrically from the supply. This asymmetrical current draw will work against the long time constant of the bias supply to cause bias voltage shifts that may cause clipping and unpredictable results. The often seen resistive voltage divider + cap bias supply is really only a low impedance to A.C. signals. Any D.C. offset, transient signal, or even circuitry with asymmetrical clipping/distortion can cause problems with the very common voltage divider + cap buffer.

Hope that is helpful/ makes sense. :)
bmxguitarsbmx
Breadboard Brother
 
Posts: 115
Joined: 25 Mar 2010, 22:15
Has thanked: 176 times
Have thanks: 61 times

Re: ISP Decimator G string

Postby POTL » 15 Apr 2017, 23:08

Already with all understood.
Now I'm confronted with another question, can I replace LF353 with TL072 or TL082.
Or is the circuit designed for LF353?
POTL
Solder Soldier
 
Posts: 221
Joined: 26 Sep 2016, 04:11
Has thanked: 46 times
Have thanks: 47 times


Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: triampel34 and 10 guests