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Old 01-16-2008, 02:54 PM   #1
BrokenStrings
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diy volume pedal vs. expression pedal

I am making both an expression pedal for my new EHX Holy Stain and a volume pedal for...solos and stuff (I don't know, I just want one ) I found the schematic for a volume pedal here. It seems as if from my limited searches on google that a volume pedal and expression pedal are essentially the same thing. Is this true?
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Old 01-16-2008, 03:05 PM   #2
Angelgiest
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a volume pedal is a type of expression pedal
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Old 01-16-2008, 03:07 PM   #3
BrokenStrings
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soooo would the schematics be the same?
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Old 01-16-2008, 03:14 PM   #4
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i think so. i think all expression pedals with effects are volume pedals, but instead of volume is gain or something. not sure though.
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Old 01-16-2008, 03:17 PM   #5
BrokenStrings
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Ok thanks alot
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Old 01-16-2008, 03:18 PM   #6
Angelgiest
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http://diyguitarist.com/DIYStompboxes/WahFAQ.htm
http://diyguitarist.com/DIYStompbox...Pedal-Retro.htm
here you go, that might be some help.

i'm not sure about active, but if you want a passive pedal it's basically just a volume pot being turned by the foot.
and for solos you may want a signal booster
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Old 01-16-2008, 03:37 PM   #7
BrokenStrings
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Yeah I'm def goin passive.
As for the signal booster, I already use either a behringer blues OD or boss DS-1

I maybe should have mentioned, I am not mod'ing a wah, I just got my hands on two sewing machine pedals.
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Old 01-16-2008, 04:09 PM   #8
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i have an old behringer wah i want to convert to volume!

is there anything else cool you can do with a wah chassis?

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Old 01-16-2008, 10:08 PM   #9
BrokenStrings
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...Im still confused as to how to approach the actual placement of the expression pedal in my pedal board. Do I place after an effect (ie. my OD) then before the EHX holy stain but just run it into the EXP PEDAL jack instead of the input?
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Old 01-16-2008, 10:20 PM   #10
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the expression pedal takes over for one of the pots on the pedal. For example, if you want it to control the depth on a flanger, the depth control on the pedal itself would be bypassed, and the pot inside the pedal will control the depth. So it won't be like after or before an effect, it'll need to plug into an expression pedal jack on the pedal you want it for (in this case the holy stain). So the schematic will be a bit different than for the volume pedal, as there'll only be one cable that connects to the expression pedal jack on the pedal from the expression pedal, rather than the in and output jacks of a volume pedal. Also, you won't need the switch shown in the schematic as the bypass switch on the pedal will be used to bypass the effect as usual.



edit: woops, I didn't notice that the second part of your post said "do I just plu it in to the EXP jack of the holy stain?". so yes, that's where you'll plug it in
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Old 01-16-2008, 10:36 PM   #11
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So how do I make the expression pedal, I can't find a schematic for an easy, passive one.
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Old 01-16-2008, 10:42 PM   #12
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if you have a wah, you can make a switch to lift the 4.7 u cap.

volume pedals are passive, and as a result when all the way FORWARD, there is no volume boost, its unity. so basically you're just reducing your volume to have the effect of a boost.

my humble suggestion:
build a boost with a footswitch to switch between pots. it will actually give you a boost and if you want it can od your amp. plus, the enclosure for an expression pedal is really expensive and totally not worth it unless you are going to build an active circuit in it, which brings me to this:

volume pedals in a typical wah enclosure will not be that useful. only a small range of the pot is used, so its just a bad idea. yeah, it can go quite to medium loud, but a boost with a footswitchable pot is much better.

If anyone is interested, i will recommend you a simple one to build and draw a diagram for the boost pot footswitch.
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Old 01-16-2008, 10:44 PM   #13
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I have two sowing machine pedals that I picked up for free...so that is not a problem.

EDIT: I understand the part about the volume pedal, but what about the expression pedal. Also, I use my DS-1 for a boost, I just wanted the volume pedal to accentuate my leads manually.
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Old 01-16-2008, 11:24 PM   #14
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well my first guess would be find the pot value and stick that pot in the expression pedal, also find which lug corresponds to which part of the jack.
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Old 01-16-2008, 11:59 PM   #15
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Quote:
Originally Posted by stevo_epi_SG_wo


i have an old behringer wah i want to convert to volume!

is there anything else cool you can do with a wah chassis?



i made a tone pedal with my broken crybaby. i put a big cap in it. sounds cool.
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Old 01-17-2008, 01:28 PM   #16
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So lemme get this straight, there will only be one jack in the expression pedal?
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Old 01-17-2008, 01:35 PM   #17
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Remember a volume pedal can only cut volume.

You'd want a couple separate circuits, and a 100k/200k Wah Pot of some sort probably. You'd need it wired as a variable resistor for the expression pedal and a voltage divider for the volume. It'd probably require a lot of creative switching...
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Old 01-17-2008, 05:56 PM   #18
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has anyone here made an expression pedal from scratch?
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Old 01-17-2008, 07:27 PM   #19
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i'm not sure if you fully understand what expression pedal means. an expression pedal is any kind of effect pedal with a rocker pedal on it designed to be rocked whilst playing. types of expression pedals: wah, volume, whammy, ive seen some other uncommon ones too. i made a tone pedal myself.

you will need two jacks on your pedal, input and out put; unless you are going to do something unconventional.

my tone pedal was directly based upon a guitar circuit, o pc board or anything like that.

guitarelectronics.com has a ton of schematics to look at, maybe you will get some inspiration there.
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Old 01-17-2008, 09:52 PM   #20
BrokenStrings
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I know what it is but i need to connect the pedal to my holy stain and therefore the expression wud ONLY be connected to the holy stain, am I wrong?

Like this almost
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Last edited by BrokenStrings : 01-17-2008 at 09:57 PM.
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