Comments on: Mod the BYOC 5-Knob Compressor

By: Tony Done

Tony Done — Tue, 13 Jan 2009 20:11:42 +0000

Hi Jack,

I’m new to pedal building, this will be my first attempt.

Could I increase the distortion by reducing the values of R26 and R33? Maybe use trimpots to try different values?

Thanks

By: admin

admin — Fri, 10 Oct 2008 22:43:42 +0000

>>>Does this apply to both the 2n5088 and the 2SC1849 transistors<<<

Yes, it would apply to either type of transistor.

regards, Jack

By: Chris Stevenson

Chris Stevenson — Fri, 10 Oct 2008 19:50:21 +0000

Hi,

Does this apply to both the 2n5088 and the 2SC1849 transistors (the pedal builder can choose which type to use)? I;ve just built one up with 2N5088 transistors and experience no distortion even with very high output pickups.

By: trevor bajus

trevor bajus — Wed, 09 Jul 2008 00:27:44 +0000

I have tried you mod, and while it does help with cleaning up the pedal, it still has a very harsh edge to it when turned up past unity gain.

Do you have any suggestions as to how to shave off some of the high end?

By: Alan

Alan — Wed, 11 Jun 2008 15:21:04 +0000

Very interesting article. I own a 2 knob BYOC comp. Could I implement this schematic into my pedal in order to add a blend knob?

By: admin

admin — Mon, 12 May 2008 11:24:03 +0000

Q3, Q4 and Q5 are part of the envelope detector and a high voltage at idle on these transistors is normal.

You should carefully tweak the setting of VR6 until you get the lowest distortion. This may help some too.

Also, turn your guitar volume knob back to about 7 and see if the distortion clears up.

regards, Jack

By: Troy Berry

Troy Berry — Sat, 10 May 2008 16:46:01 +0000

I tried this mod on my 5 knob and it did clean it up a little. There is still some distortion. I did some check on the other transistor and Q3,Q4 and Q5 all have values over 7. Could you verify if this is also causing a problem? Thanks a bunch.