If you have Line 6 Spider amplifier, and you don't have the foot pedal as an accessory, I bet you wish you did? This hack might be for you.
If you notice on the amplifier there is a 8 pin jack similar to what people in the network world call a RJ45 jack.
Well I looked all over on the Internet, and could not find an answer to my question. What is the schematic for the foot switch? So I started to investigate what each pin did. I assumed since Line 6 is mostly digital based, I'm dealing with high and lows. i.e. One's and zero's.
I got my digital multimeter and figured out the voltage on the various pins to ground.
Pin 1 Ground
Pin 2 + 5 VDC
Pin 3 + Ground
Pin 4 + 5 VDC
Pin 5 +.1 ? Not quite ground
Pin 6 + 5 VDC
Pin 7 + 5 VDC
Pin 8 + 5 VDC
Pin 5 seemed kind of odd to me, so I shorted it to pin 6. To my surprise the amplifier shuts all effects down. Including the LEDs, but low and behold I still get amplification, but no effects. Just plain amplification is all I would get. If I short to pin 6 to pin 5 again, it toggles back to the effect. Voila, I get some control with my own rigged up foot switch.
Pin 5 must be a trigger that's my only deductions. I tried other combinations like 7 and 1 it seems to reset the amp.
You may want to play with shorting to other pins, but pins 5 and 6 seem to be the most useful I noticed when the effect is really distorted with overdrive there is a slight pop sometimes when it kicks in, so you might find that shorting pin 7 and 1 might be more useful in this case, but you would have to install two switches.
RJ45 Jack I'm using a Levington Jack from Home Depot. The package comes with a punch down tool too.
Some 22 guage wire to punch down to a jack. Scrap from CAT5e cable will do.
A suface mount box to house jack. This is the Leviton box made for the jack that I purchased.
Patch network cord 8 pin plug on both sides. It has to be a straight through cable.
A normally open switch to provide the momentary short to toggle effect.
Solder to secure the wire to the switch.
Punch down tool like the one in the picture
3/8 bit to drill into the plastic box.
When punching down the wire on the jack I followed the T568B which is the standard that most people follow.
I picked solid green and White blue which are pins 5 and 6 of the jack.
You can probably buy all the parts for less than $10.00. You can splurge on LED's and a 330 ohm resisters to show connectivity since we are dealing with 5 volts at the end of the wire, but not necessary.
A simple hack!
Well there you have it! Let me know if you find something else, or improvement to this hack.
I know I'm probably doing something that LIne 6 probably would say not to do, but it's worked for me, and now I'm enjoying my amp more.
I could not get the video to work using the uploader, so I posted the video on you tube. The link is imbeded in the body of this instructible.