Fortin - Grind Pedal

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

Re: Fortin - Grind Pedal

Postby bmxguitarsbmx » 06 Dec 2017, 23:07

I have both grind and 33. They are on loan because my amps are really too tight to boost. I thought the 33 said OPA2604, but maybe it said "OPA604" (single version of OPA2604). I'll track them down this weekend and confirm.

For this message the author bmxguitarsbmx has received thanks: 2
dv8r601 (08 Dec 2017, 00:48), Optical (01 Mar 2018, 06:34)
bmxguitarsbmx
Breadboard Brother
 
Posts: 132
Joined: 25 Mar 2010, 22:15
Has thanked: 222 times
Have thanks: 70 times

Re: Fortin - Grind Pedal

Postby sledgehammer » 01 Jan 2018, 16:17

Anyone built the vero version? Mine works "okay" - all pots are doing what they should do and the preamp is amplifying the signal. But i got quite some high frequency hiss when turning the treble up (tested with different power supplies and battery the behaviour stays the same). Any ideas how to improve this?
User avatar
sledgehammer
 
Posts: 11
Joined: 10 Aug 2007, 12:26
Has thanked: 9 times
Have thanks: 2 times

Re: Fortin - Grind Pedal

Postby mnemonic » 02 Jan 2018, 20:59

sledgehammer wrote:Anyone built the vero version? Mine works "okay" - all pots are doing what they should do and the preamp is amplifying the signal. But i got quite some high frequency hiss when turning the treble up (tested with different power supplies and battery the behaviour stays the same). Any ideas how to improve this?


It’s a baxandall eq and the high band is centered at 10khz so it certainly can add hiss and feedback, especially in higher gain situations. I don’t think I ever go higher than like 1:00 with the treble. It’s nice to add a bit of extra brightness or bite, but it can get out of hand and brittle easy.

I guess you could alter the part values around the treble control to lower the centre frequency into a more usable range for guitar.

For this message the author mnemonic has received thanks:
sledgehammer (04 Jan 2018, 20:24)
mnemonic
 
Posts: 6
Joined: 28 Sep 2017, 17:22
Has thanked: 0 time
Have thanks: 3 times

Re: Fortin - Grind Pedal

Postby Leito79 » 04 Jan 2018, 11:45

bmxguitarsbmx wrote:I have both grind and 33. They are on loan because my amps are really too tight to boost. I thought the 33 said OPA2604, but maybe it said "OPA604" (single version of OPA2604). I'll track them down this weekend and confirm.

Did you got them back? Some pictures of their circuit boards will be awesome!!!
Leito79
 
Posts: 9
Joined: 23 Nov 2009, 16:38
Has thanked: 1 time
Have thanks: 0 time

Re: Fortin - Grind Pedal

Postby audioguy » 15 Feb 2018, 01:49

Any chance someone's done a single layer, etch-at-home version?

J0K3RX wrote:I believe you guys are right about the grind/33 being a TC Electronic integrated pre clone, makes sense :thumbsup

nice layout & scematic here..
http://www.rullywow.com/wp-content/uplo ... e-v1.0.pdf
audioguy
Resistor Ronker
 
Posts: 259
Joined: 27 Nov 2007, 15:47
Has thanked: 24 times
Have thanks: 6 times

Re: Fortin - Grind Pedal

Postby Optical » 26 Feb 2018, 02:20

I got a couple of Rullywow Chuggapre boards a week ago.
Just waiting on a couple of bit to arrive then I'll try it out
Optical
 
Posts: 48
Joined: 28 Jul 2016, 23:44
Location: Auckland
Has thanked: 6 times
Have thanks: 6 times

Re: Fortin - Grind Pedal

Postby Optical » 01 Mar 2018, 06:34

bmxguitarsbmx wrote:I have both grind and 33. They are on loan because my amps are really too tight to boost. I thought the 33 said OPA2604, but maybe it said "OPA604" (single version of OPA2604). I'll track them down this weekend and confirm.



Any update?
Optical
 
Posts: 48
Joined: 28 Jul 2016, 23:44
Location: Auckland
Has thanked: 6 times
Have thanks: 6 times

Re: Fortin - Grind Pedal

Postby bmxguitarsbmx » 01 Mar 2018, 19:35

Hey Optical!

Grind is Burr Brown OPA604AP (single op amp) and Texas Instruments LT1054IP (Charge Pump). 33 is gone [smilie=a_damnit.gif]
bmxguitarsbmx
Breadboard Brother
 
Posts: 132
Joined: 25 Mar 2010, 22:15
Has thanked: 222 times
Have thanks: 70 times

Re: Fortin - Grind Pedal

Postby Optical » 01 Mar 2018, 21:15

Ok, much as we thought. So just another TC integrated pre clone with probably a component value tweak to the filter center frequencies...
Are you able to read the cap values?
Optical
 
Posts: 48
Joined: 28 Jul 2016, 23:44
Location: Auckland
Has thanked: 6 times
Have thanks: 6 times

Re: Fortin - Grind Pedal

Postby Optical » 13 Apr 2018, 05:42

Some filter frequency info on the 33 pedal in this video at 28mins https://www.youtube.com/watch?v=i86Zx0L8yf0

130Hz -10dB; 390Hz 0dB; 950Hz 7.5dB; 2.2kHz 5.8dB; 4.9kHz+ 5dB
Optical
 
Posts: 48
Joined: 28 Jul 2016, 23:44
Location: Auckland
Has thanked: 6 times
Have thanks: 6 times

Previous

Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: Aleter, Boba7, Cub, John G, juice2, Rocket Roll, tube65, wokkel and 19 guests