Recently i was given this pedal which must be an older version (built around 1998) of the axess electronics bf2 buffer. The pedal is not working, no signal is passing through it, but all wires solders e.t.c are ok inside. I suspect there is something wrong with the opamp so i would like to try and find a replacement and see if that works.
Here is how the pedal looks:
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0001.jpg)
And here is the picture of the circuit:
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0002-2.jpg)
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0003-1.jpg)
As you may see on the circuit it is stamped "BUF REV 2 (C) 1998 AE)" In these pictures as you may notce i have taken off the opamp. The opamp has ablolutely no writting on it so i can identify it.
Now the problem is that someone has scratched off the writting on the surface of the opamp so i cannot see which opamp it is in order to try and find a replacement:
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0004.jpg)
So do you know which kind of opamp was axess electronics using at this era for the buffer and if not which opamp i may try to make it work???
On the base of the pedal it is written:"BUF Custom Guitar Audio Buffer" #BF20A
Ask Mario Marino the Owner/Designer of Axess Electronics. He is very helpful. I bought some gear from him in 1999 and he answered every email that I sent to him. He answered every single question and even give me some hints to modify my midi controller. He's the best Customer Service person I have dealt with.
http://www.axess-electronics.com/
CG ;D
Have you tried emailing them and asking?
That would be the first thing to do.
If they are non communicato you could....
Buy a TL071 and TL072 and just plug them in to see which one will work.
Or
pry it off the epoxy and determine which pin is getting +9V DC.
Then study the DIYFAQ section on opamps and you will be able to tell if its a single or dual opamp by the pinout and where the 9VDC is going.
After you have determined that, there are general purpose and high end opamps to choose from.
Someone here a while back mentioned Burr Brown opamps as the high end equivalent to the run of the mill TL072.
Do a (http://www.diystompboxes.com/smfforum/Themes/diytheme/images/english/search.gif) for Burr Brown and you will find that part number.
Good Luck
I have an Axess buffer very similar to that one. It's probably the same thing. Unfortunately, I believe the chip in mine has been erased the same as yours. I'll have another look tonight....
B.
Quote from: fenderiarhs on October 31, 2007, 02:58:57 PM
Recently i was given this pedal which must be an older version (built around 1998) of the axess electronics bf2 buffer. The pedal is not working, no signal is passing through it, but all wires solders e.t.c are ok inside. I suspect there is something wrong with the opamp so i would like to try and find a replacement and see if that works.
Here is how the pedal looks:
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0001.jpg)
And here is the picture of the circuit:
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0002-2.jpg)
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0003-1.jpg)
As you may see on the circuit it is stamped "BUF REV 2 (C) 1998 AE)" In these pictures as you may notce i have taken off the opamp. The opamp has ablolutely no writting on it so i can identify it.
Now the problem is that someone has scratched off the writting on the surface of the opamp so i cannot see which opamp it is in order to try and find a replacement:
(http://i4.photobucket.com/albums/y120/fenderiarhs/IMG_0004.jpg)
So do you know which kind of opamp was axess electronics using at this era for the buffer and if not which opamp i may try to make it work???
On the base of the pedal it is written:"BUF Custom Guitar Audio Buffer" #BF20A
You still have these pics?