Comments on: Opamp Buffer Layout

By: BUFFERED AB-Y « Rhythm & Detonation

BUFFERED AB-Y « Rhythm & Detonation — Tue, 24 Aug 2010 03:35:03 +0000

[...] split. I searched around and came across a great buffer that uses an op-amp over at Jack Orman's Site. The input impedance is over 1M and the output impedance is low, so that it can drive two amps. It [...]

By: the3secondrule

the3secondrule — Wed, 19 May 2010 10:32:01 +0000

very nice! so would this be suitable a an output buffer for using a wah in front of a fuzz pedal?

By: RO

RO — Tue, 18 May 2010 07:15:57 +0000

Great little board I suspect!

Using the two sides of the opamp on the same output, stacking them (with 2 100Ohm resistors) just as in the super buffer…Would that work (well)?

By: admin

admin — Mon, 03 May 2010 02:41:18 +0000

R3 is a pulldown resistor for the output. It is not necessary unless you want to switch the buffer off/on.

By: Mark

Mark — Sun, 02 May 2010 12:43:37 +0000

Jack, what is the purpuse of R3? I’ve built this buffer before w/o R3. Is it an improvement?

By: ian

ian — Mon, 26 Apr 2010 12:43:23 +0000

Hi thanks for the advice about the caps.

It’s weird I have built it, but it actually seems to work the opposite ,it makes the guitar quieter and dulls the tone. I cut the 3 segments as directed behind the tl072. I have double and triple checked I got all the wires in the right place and components, any ideas??

Thanks
Ian

By: Jboy

Jboy — Mon, 26 Apr 2010 03:57:54 +0000

I see. Anyway, I tried to build the AMZ super buffer and had mixed results, I am sure it has to do with beginner luck,not design. At times it was popping and interference. I used 2 TL072 and radio shack board. The circuit was working had sound high Z output, but the pot acted funny, and circuit would not work when grounded to guitar. I would lke to take another stab at making the above buffer, which looks the same but one stage, where can I find the etching to complete the project?

By: admin

admin — Fri, 23 Apr 2010 23:49:28 +0000

The one with the plus sign is an electrolytic capacitor and the other would be a film capacitor or even a ceramic.

By: ian

ian — Fri, 23 Apr 2010 15:48:39 +0000

Hi
What type of capacitors should I buy, I notice one has a plus sign and the other not. Does that mean 1 has to be polarised and the other none polarised? Sorry if this is a numpty question but I can follow a diagram and solder but don’t know much at all about resistors capacitors etc.

Cheers

By: Jboy

Jboy — Mon, 12 Apr 2010 06:10:11 +0000

I am interested in a buffer to place inside my guitar before an on board effects loop designed by Jerry Garcia. He used a buffer in his guitars to drive his long lines and loops, each pedal in its own true bypass loop. When I switch my OBEL off, I am only driving the line from the guitar to the amp totally bypassing the effects loop. Very natural sounding. When I turn on the OBEL, the buffers in the pedals, even in bypass, change the tone like night and day. a remedy would be to buffer the non OBEL. My question, how similar is this buffer to John Cutler’s CB1? And will this buffer add to the already buffered signal from the Boss’s?