Buff n Blend ... Works, but can it be reversed?

Started by sixstringphil, December 12, 2009, 11:19:53 PM

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sixstringphil

I'm using the Buff 'n Blend along with a BMP. The blend seems to function in this way... The clean volume stays fairly constant and it gradually blends in the effected signal.  This is the opposite of what I want to happen; I'd like to gradually blend in the clean signal. I'm using the following:

Buff 'n Blend circuit by Joel Purkiss, schematic on Beavisaudio.com ...
http://www.beavisaudio.com/techpages/BlocksFragments/BuffNBlend.gif

Layout:
http://www.aronnelson.com/gallery/main.php/v/BarcodeVeroLayouts/album120/buffnblendPCB.gif.html

The only differences to the original circuit - I ommitted the R4 resistor (which had been changed to 47k in the pcb layout)

Is what I'm trying to accomplish possible with this circuit, or do I need something else?

EDIT:
Seems like reversing the pot taper may be able to get me closer to what I wanted. Maybe even use linear instead of audio taper?


ubersam

I'm assuming that as it is, starting with the pot in full CCW turn, you get more clean signal. As you turn CW, you blend more of the BMP in. Try reversing the wires going to the outer lugs of the blend pot so that you start with more BMP when the blend knob is fully CCW, and as you turn the blend knob CW, you get more clean signal.

sixstringphil

That's what I was saying about the taper. Since it's an audio taper pot, the lug positions make a huge difference in the feel. I like it a little better when I switched it. The linear pot wasn't bad either.

alfafalfa

I do like your tbl4 when I had a look at your pedals !

Do you have a schematic for it and are you willing to share it .

Thanks beforehand ,

Alf

sixstringphil

#4
Is it normal to get some amount of clean bleed-through even with the blend knob turned all the way to the effect side?

Alf: This page should have all the info you need and more... http://www.singlecoil.com/tb-strip/tbstrip.html