Print Page - Collosalus volume drop in the fx loop

Title: Collosalus volume drop in the fx loop
Post by: brejna on April 01, 2013, 12:54:59 PM

Hi, today i have put collosalus in the fx loop and there is little volume drop when fx is engaged.
Does anyone knows what resistors could be changed to raise volume a bit? Is it R7 or R5 or?
Thanks
Brane
http://www.madbeanpedals.com/projects/Collosalus/docs/Collosalus.pdf (http://www.madbeanpedals.com/projects/Collosalus/docs/Collosalus.pdf)

Title: Re: Collosalus volume drop in the fx loop
Post by: brejna on April 05, 2013, 01:42:50 PM

anyone, any ideas?

Title: Re: Collosalus volume drop in the fx loop
Post by: Scruffie on April 05, 2013, 03:00:58 PM

R7 would increase the output gain if raised.

Title: Re: Re: Collosalus volume drop in the fx loop
Post by: jimilee on April 05, 2013, 03:42:21 PM

Could you replace it with a volume pot?

Title: Re: Collosalus volume drop in the fx loop
Post by: brejna on April 05, 2013, 05:03:23 PM

thanks for reply guys, I'll try with changing R7 with the other value (probably 120K or higher).
Also idea of putting potentiometer is not bad, but I think that I don't need it right now. :)

Title: Re: Collosalus volume drop in the fx loop
Post by: brejna on April 05, 2013, 06:45:28 PM

Update: I've put socket in R7 place and try values from 120K-220K. With bigger values you get higher volume but also lot of bass, so I ended up puting 120K and it is compromised solution for me.
Thanks once again for help :)
Brane

Title: Re: Collosalus volume drop in the fx loop
Post by: hammerheadmusicman on April 05, 2013, 09:44:51 PM

Quote from: jimilee on April 05, 2013, 03:42:21 PM
Could you replace it with a volume pot?

I don't know about this circuit, as to it's function. But, if that's the resistor to change, i would imagine you could put in a variable resistor either as a internal trim pot, or external pot if you so wished..

George

Title: Re: Collosalus volume drop in the fx loop
Post by: brejna on April 05, 2013, 10:24:34 PM

I agree with you, it is possible.. and R7 is definitely right resistor.
But as I sad before you are not getting just volume adjustment, also there is change in lower frequency's..

Title: Re: Collosalus volume drop in the fx loop
Post by: hammerheadmusicman on April 05, 2013, 10:48:43 PM

sorry, must have skimmed that bit! ;)

George

Title: Re: Collosalus volume drop in the fx loop
Post by: brejna on April 05, 2013, 11:56:15 PM

::)
:P
;D

Title: Re: Collosalus volume drop in the fx loop
Post by: madbean on April 06, 2013, 12:52:27 AM

Quote from: brejna on April 05, 2013, 10:24:34 PM
I agree with you, it is possible.. and R7 is definitely right resistor.
But as I sad before you are not getting just volume adjustment, also there is change in lower frequency's..

Hi brejna, try socketing R8 and then reduce to 5k1 or lower. That will bump up higher frequencies which may reduce the perception of bass somewhat.

Title: Re: Collosalus volume drop in the fx loop
Post by: brejna on April 06, 2013, 09:41:11 AM

Thanks for suggestion, I'll try it today.

Title: Re: Collosalus volume drop in the fx loop
Post by: Scruffie on April 08, 2013, 09:40:19 AM

Well that section is also filtering, no schematic in front of me but you should be able to find out the math to keep it all the same with more volume and the sameish cut off frequency.

Failing all that, you can just add a boost to the end.

madbeanpedals::forum

Projects => General Questions => Mods => Topic started by: brejna on April 01, 2013, 12:54:59 PM