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DIY Stompboxes => Building your own stompbox => Topic started by: RandomGlitch on February 15, 2012, 09:50:06 PM

Title: Boss Chorus - fixing unwanted boost
Post by: RandomGlitch on February 15, 2012, 09:50:06 PM
I've got this Boss Chorus (CE-2) which I like the sound of, but it REALLY annoys me by boosting the level when I engage it.

Apparently some players like this feature, but I don't.  I have the schematics in front of me -

http://www.hobby-hour.com/electronics/s/boss-ce2-chorus-schematic.php (http://www.hobby-hour.com/electronics/s/boss-ce2-chorus-schematic.php)

can anyone tell me if it is possible to adjust the overall level when the effect is engaged?

The only thing I could think of was reboxing it, making it true-bypass and adding a voltage divider across the output.  But that seems more than a little to much work just to fix a minor, but annoying problem with an otherwise great pedal.

Thanks in advance!!
Title: Re: Boss Chorus - fixing unwanted boost
Post by: Fender3D on February 16, 2012, 07:00:37 AM
By changing R22 you'll affect the wet mix level.
By changing R21 you'll affect the dry mix level.
By changing R6 you'll affect the signal going to BBD.
Title: Re: Boss Chorus - fixing unwanted boost
Post by: oldschoolanalog on February 16, 2012, 07:36:49 AM
Post deleted for useless content.
Title: Re: Boss Chorus - fixing unwanted boost
Post by: petemoore on February 16, 2012, 08:51:22 AM
   replace the 100k of R26 with a 100k potwafer, adjust to taste [wiper to output].
   Since a pot won't fit in there, measure the resistance between the new pots lugs 1 and 2...replace this side with a fixed resistor of same or near same value.
   Repeat for the other side of the pot...you've built a fixed voltage divider [two resistors mimic the desired pot setting] based on the values you found by using a variable voltage divider [the 100k pot] to find the 2 resistors values for a divider which make the output level unity or whatever.
   Using a 100k pot to replace the 100k resistor [so the output loading remains the same]. Then using two resistors for the divider that add up to about 100k or so.