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DIY Stompboxes => Building your own stompbox => Topic started by: Baranouil on June 04, 2022, 03:52:51 PM

Title: Coloursound Jumbo Tonebender
Post by: Baranouil on June 04, 2022, 03:52:51 PM
Hi guys,

I recently built a coloursound jumber tonebender following this layout:
(https://i.postimg.cc/94F5VFQj/Colorsound-Jumbo-Tonebender.png) (https://postimg.cc/94F5VFQj)


I have 2 issues there:
1° I need to almost turn all the way up the volume pot to have decent amount of sound. Any idea from where the problem could come from?
2° Also I have almost no gain. Do you think it could come from the fact i replaced all the 500pf caps by 680pf caps? And replaced all the transistors (BC184C) by 2N5088 transistors?

Thanks :)

Here is the schematic:
(https://i.postimg.cc/XB9DdTY8/jumbotonebenderschem.gif) (https://postimg.cc/XB9DdTY8)
Title: Re: Coloursound Jumbo Tonebender
Post by: PRR on June 04, 2022, 03:56:16 PM
Numbers 1° and 2° are the same complaint. It's not the parts you used.

https://aronnelson.com/diywiki/index.php?title=Debugging
Title: Re: Coloursound Jumbo Tonebender
Post by: antonis on June 04, 2022, 05:31:33 PM
It might be the parts you used, if those parts are of wrong value..

e.g. 82k instead of 8k2 and/or 47k instead of 470k..
Or 1k instead of 100R, or 1k5 instead of 15k or.. or..
Title: Re: Coloursound Jumbo Tonebender
Post by: andy-h-h on June 05, 2022, 02:54:33 AM
Hello

Point 1.  Could be a number of things causing this.  Photos and voltages if you can?  Otherwise it's a guessing game.     

Point 2.  No - changing transistors and those caps will not be responsible for low levels. 

Good luck
Title: Re: Coloursound Jumbo Tonebender
Post by: Rob Strand on June 05, 2022, 03:31:55 AM
Check your transistor pinouts.   If c and e are swapped you could get low gain.

If possible post voltage measurements for the transistors.
Title: Re: Coloursound Jumbo Tonebender
Post by: Baranouil on June 05, 2022, 11:31:40 AM
Thanks everyone!
Turns out, transistors were not the right way.
Now everything is working!