Go Back   UG Community @ Ultimate-Guitar.Com > Instruments > Gear Building & Customizing
User Name  
Password
Search:

Reply
Old 10-14-2012, 09:55 PM   #1
saint22
is a Registered User
 
saint22's Avatar
 
Join Date: Dec 2007
How do footswitches work?

I'm talking about simple channel switching footswitches. I assume they control some sort of relay? I'd like to add a couple of LEDs to my footswitch. I was thinking about trying to power them from the voltage across the switch but according to my multimeter there isn't any, whether the switch is open or closed.

Am I misunderstanding how they work?
saint22 is offline   Reply With Quote
Old 10-14-2012, 10:00 PM   #2
roshjosh
Registered User
 
roshjosh's Avatar
 
Join Date: Jun 2008
Location: Toronto, Canada
The power that moves through a footswitch (if any) is not going to be able to power an LED. It's like adding an LED into your guitar circuitry.
__________________
My Youtube Videos of Guitar
roshjosh is offline   Reply With Quote
Old 10-14-2012, 10:02 PM   #3
Kevin Saale
Talks to empty chairs
 
Kevin Saale's Avatar
 
Join Date: Dec 2007
Location: In a desert, next to a chair
I'm almost positive the footswitches with LEDs have that in mind when the switching circuit is designed so that there is enough voltage to the pedal to light the LEDs.

Which means in your case, you'd have to get the power from somewhere else likely.
__________________
I don't give a shit if you listen to me or not.

Quote:
Get three coffins ready.

My mistake, four coffins.
Kevin Saale is offline   Reply With Quote
Old 10-14-2012, 10:10 PM   #4
saint22
is a Registered User
 
saint22's Avatar
 
Join Date: Dec 2007
Oh well. I've got a few extra spot on my one spot, I'll just add a 9v jack I guess.
saint22 is offline   Reply With Quote
Old 10-14-2012, 10:14 PM   #5
saint22
is a Registered User
 
saint22's Avatar
 
Join Date: Dec 2007
Wait, so does the guitar signal actually flow through the footswitch?
saint22 is offline   Reply With Quote
Old 10-14-2012, 10:26 PM   #6
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
Quote:
Originally Posted by saint22
Wait, so does the guitar signal actually flow through the footswitch?


No. Not ever. What is your amp? I can give you a general idea of how it works if I knew the specific amp.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-14-2012, 10:30 PM   #7
saint22
is a Registered User
 
saint22's Avatar
 
Join Date: Dec 2007
Peavey Classic 30. I'm using the vox 2 button switch. I didn't think the signal went through the footswitch, but I was confused by the guy saying it was similar to trying to power an via by a guitar signal. Is it just that it's a millivolt level signal?
saint22 is offline   Reply With Quote
Old 10-14-2012, 10:41 PM   #8
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
Quote:
Originally Posted by saint22
Peavey Classic 30. I'm using the vox 2 button switch. I didn't think the signal went through the footswitch, but I was confused by the guy saying it was similar to trying to power an via by a guitar signal. Is it just that it's a millivolt level signal?


I'm honestly not going to concern myself with the guitar signal statement.

How the footswitch works in a Peavey Classic 30:

The footswitch jack consists of several connections, but we will concern ourselves with the two the pertain to the actual switching: The tip and the shield. The shield is grounded at all times. When the footswitch is activated, the tip gets shorted out to the shield and becomes grounded as well.

This grounding completes a circuit in a relay inside the amp. The relay is just an electrically activated switch. This switch puts part of the circuit into an active state that gives a boosting effect.

No signals pass through the footswitch. It is only a ground being completed.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-14-2012, 10:48 PM   #9
saint22
is a Registered User
 
saint22's Avatar
 
Join Date: Dec 2007
But then there must be a voltage when the switch is open. Is the issue just that it's an extremely small voltage?
saint22 is offline   Reply With Quote
Old 10-14-2012, 10:54 PM   #10
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
Quote:
Originally Posted by saint22
But then there must be a voltage when the switch is open. Is the issue just that it's an extremely small voltage?


A voltage happens when a current flows through a resistance. There is a difference in a potential, but that doesn't mean there is useable voltage there.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-14-2012, 11:19 PM   #11
gypsyblues7373
Registered User
 
Join Date: May 2010
There's a guy on evil bay that sells metal LED footswitches for the Classic 30. I got one for a Delta Blues (which is pretty much just a Classic 30 with tremolo) that I bought used that had no footswitch. Works like a charm, seems pretty sturdy. Unless you just want the experience of making one yourself.
gypsyblues7373 is offline   Reply With Quote
Old 10-15-2012, 03:44 AM   #12
seljer
UG Resident
 
seljer's Avatar
 
Join Date: Apr 2005
Location: Slovenija
An amp can be designed to have enough current run through the footswitch to enable a indicator LED without any other power. Though it entirely depends on what the designer did in his design.

The surest thing to do is just use dual pole switches with a seperate power source for lighting the LEDs
seljer is offline   Reply With Quote
Old 10-15-2012, 08:46 AM   #13
Rossmillertarn!
Boom ting !
 
Rossmillertarn!'s Avatar
 
Join Date: Nov 2009
Location: Barnsley, UK
Guys, the LEDs on footswitches are powered from the amp itself. the amp sends a 9v current through to the footswitch just for this purpose.

__________________
Gear:-
Mesa Single Rectifier
Marshall DSL50 (In the process of modding!)
Fender 2x12 Deville
Marshall 1960 (V30's)
Gibson SG Standard
Gibson SG Special
Fender 'Marcus Miller' Jazz Bass

My Band
Juturna

Rossmillertarn! is offline   Reply With Quote
Reply


Thread Tools Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -4. The time now is 03:53 AM.

Forum Archives / About / Terms of Use / Advertise / Contact / Ultimate-Guitar.Com © 2014
Powered by: vBulletin Version 3.0.9
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.