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Buffer box.

Started by hoostavah, July 19, 2009, 01:47:49 AM

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hoostavah

July 19, 2009, 01:47:49 AM
I would like to build a buffer box that my guitar would go into. much like a wireless unit and mount it on a strap, so I can use long cables with no signal loss. I have an alembic stratoblaster from GGG. That is similar to what I would build but I want no switch and an led is not necessary either. Any suggestions?

BAARON

#1
July 19, 2009, 02:17:48 AM
http://www.muzique.com/lab/buffers.htm  Thar be some buffers for ye.
B. Aaron Ennis
If somebody makes a mistake, help them understand what went wrong.  Show them how to do it right.  Be helpful.  Don't just say "you're wrong, moron."

EW57

#3
July 19, 2009, 05:53:58 PM
Why do these circuits use such a large output coupling capacitor (10uf)?

anchovie

#4
July 19, 2009, 06:02:22 PM
Because the output cap and the input impedance of whatever follows the buffer will form a high-pass filter. Using a big cap pretty much guarantees that whatever the rolloff frequency of this filter may be is way below the bottom end of the frequency range of a guitar signal.
Bringing you yesterday's technology tomorrow.

EW57

#5
July 19, 2009, 11:28:18 PM
Quote from: anchovie on July 19, 2009, 06:02:22 PM
Because the output cap and the input impedance of whatever follows the buffer will form a high-pass filter.

Ok, so is there another way to proactively approach this so as to not have an electrolytic cap in the signal path?

Thanks again!

BAARON

#6
July 20, 2009, 12:03:24 AM
Personally, I don't think it's worth the trouble.

http://www.muzique.com/lab/distortion.htm explains how little distortion an electrolytic coupling cap adds to your signal.  (Essentially: none.)
B. Aaron Ennis
If somebody makes a mistake, help them understand what went wrong.  Show them how to do it right.  Be helpful.  Don't just say "you're wrong, moron."

hoostavah

#7
July 20, 2009, 12:46:13 AM
What about making this circuit with a boost that is variable by a pot from the outside? I kinda want to emulate a pickup booster without building one into my guitar.

BAARON

#8
July 20, 2009, 12:58:53 AM
So build a ZVex Super Hard On.  With the gain turned down, it acts (more or less) as a buffer and does a nice job sparkling up your tone.  With the gain turned up, it's a booster.  You can find the schematic for it at the bottom of this page... http://analogguru.an.ohost.de/

As a side note, I use 2M2 resistors instead of 10M when I build it and it sounds fine.
B. Aaron Ennis
If somebody makes a mistake, help them understand what went wrong.  Show them how to do it right.  Be helpful.  Don't just say "you're wrong, moron."

hoostavah

#9
July 20, 2009, 06:43:40 PM
If i decide to use no led could I switch to the smaller dpdt switches? I might just do something like the stratoblaster but tweak the circuit and take out things I dont need.

BAARON

#10
July 20, 2009, 07:57:57 PM
Quote from: hoostavah on July 20, 2009, 06:43:40 PM
If i decide to use no led could I switch to the smaller dpdt switches? I might just do something like the stratoblaster but tweak the circuit and take out things I dont need.

Yes.  You can use a DPDT if you don't use an LED.

You could use the stratoblaster if you want.
B. Aaron Ennis
If somebody makes a mistake, help them understand what went wrong.  Show them how to do it right.  Be helpful.  Don't just say "you're wrong, moron."

Ben N

#11
July 20, 2009, 08:39:42 PM
Quote from: hoostavah on July 20, 2009, 06:43:40 PM
If i decide to use no led could I switch to the smaller dpdt switches? I might just do something like the stratoblaster but tweak the circuit and take out things I dont need.
SB is pretty minimalist already. You should also check the AMZ MOSFET Boost article, including the option to switch between buffer and boost.
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