madbeanpedals::forum

General => Open Discussion => Topic started by: culturejam on October 12, 2016, 04:53:46 AM

Title: If you built the DuoVibe and thought it was dark....
Post by: culturejam on October 12, 2016, 04:53:46 AM
...you are right!

I was laying in bed the other night and suddenly the fix came to me. I tested it just now, and it totally works.

The mod can be made without cutting traces or desoldering any parts. All you need to do is add a cap in parallel with R3 (emitter resistor on Q1). This adds an emitter-bypass cap for Q1 and boosts the gain on higher frequencies. 100n is too much, I can tell you. I would suggest trying 10n and see how it sounds A/B with bypass. Testing with a dirt box in front will really make it obvious.

If anybody does the mod, I'd love to hear your results.
Title: Re: If you built the DuoVibe and thought it was dark....
Post by: pickdropper on October 12, 2016, 04:58:30 AM
I'll try to do it sometime in the next week or so.  I still have this one kicking around:

(http://img.photobucket.com/albums/v158/pickdropper/Guitar%20Pedals/GreaseVibeMockup_zps0bafeced.jpg) (http://smg.photobucket.com/user/pickdropper/media/Guitar%20Pedals/GreaseVibeMockup_zps0bafeced.jpg.html)

(http://img.photobucket.com/albums/v158/pickdropper/Guitar%20Pedals/DualFunction2_zps923033d8.jpg) (http://smg.photobucket.com/user/pickdropper/media/Guitar%20Pedals/DualFunction2_zps923033d8.jpg.html)
Title: Re: If you built the DuoVibe and thought it was dark....
Post by: alanp on October 12, 2016, 07:42:26 AM
That reminds me that I need to get my DuoVibe built... and the FF/TB board. :(

Maybe I can put them in a BB triple effect!
Title: Re: If you built the DuoVibe and thought it was dark....
Post by: Morgan on October 15, 2016, 06:39:18 PM
Duovibe's been on my board for a year. Not sure I can live without the darkness!
Title: Re: If you built the DuoVibe and thought it was dark....
Post by: culturejam on October 15, 2016, 06:50:46 PM
Quote from: Morgan on October 15, 2016, 06:39:18 PM
Duovibe's been on my board for a year. Not sure I can live without the darkness!

A great mod would be to have a toggle to go between stock and "bright" (or really, normal).

I did some more testing last night, and 10n is just about dead-on to bypass. But larger caps do sound really good as well, though it's a fair bit brighter than bypass. Could be a neat way to goose the upper-mids and stand out in a band mix maybe.