Fortin - Grind Pedal

[bmxguitarsbmx]

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.

[sledgehammer]

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?

[mnemonic]

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.

[Leito79]

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!!!

[audioguy]

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

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

nice layout & scematic here..
http://www.rullywow.com/wp-content/uplo ... e-v1.0.pdf

[Optical]

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]

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?

[bmxguitarsbmx]

Hey Optical!

Grind is Burr Brown OPA604AP (single op amp) and Texas Instruments LT1054IP (Charge Pump). 33 is gone

[Optical]

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]

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