Trace Elliot C100 Speed Twin

[Hhabersat]

I just picked up a mint condition Trace Elliot C100 Speed Twin. It did not come with any footswitches. There is an 8 pin DIN jack for a 5 function footswitch. I cannot find any info on the original footswitch that Trace Elliot sold but did get a schematic of the amp and see that I can build one with momentary switches.
I would like to be able to have LED's on this homemade footswitch to be able to see what condition the switched functions are in. Does anyone have a schematic of the original footswitch?

[Mars Amp Repair]

Say,
I noticed that on the Britishaudioservice.com site, there are free owners manuals downloads. They have the pin-out for the Speed Twin in there. glen - mars amp repair

Originally Posted by Hhabersat

I just picked up a mint condition Trace Elliot C100 Speed Twin. It did not come with any footswitches. There is an 8 pin DIN jack for a 5 function footswitch. I cannot find any info on the original footswitch that Trace Elliot sold but did get a schematic of the amp and see that I can build one with momentary switches.
I would like to be able to have LED's on this homemade footswitch to be able to see what condition the switched functions are in. Does anyone have a schematic of the original footswitch?

[Hhabersat]

Thanks.
I was able to find out more about the original (unavailable) footswitch. It seems that the original footswitch had a duplicate digital switching circuit that is in the amp itself. This is how it was able to have indicating LED's for the switch functions.
I have since talked to a tech at the US service center for Trace Elliot and he said without this circuitry it's impossible to get remote indication.
The best I can do is to build a footswitch with the appropriate momentary switches, multiconductor cable and DIN plug (which I found at Mouser) and not have indicating LED's.
It's worth it since this amp sounds really good and I will be able to remotely control Channel Selection, Boost, Master Selection (this amp has 2 switchable master volume controls) and the Effects Loop.

[johnnieboy2]

Originally Posted by Hhabersat

Thanks.
I was able to find out more about the original (unavailable) footswitch. It seems that the original footswitch had a duplicate digital switching circuit that is in the amp itself. This is how it was able to have indicating LED's for the switch functions.
I have since talked to a tech at the US service center for Trace Elliot and he said without this circuitry it's impossible to get remote indication.
The best I can do is to build a footswitch with the appropriate momentary switches, multiconductor cable and DIN plug (which I found at Mouser) and not have indicating LED's.
It's worth it since this amp sounds really good and I will be able to remotely control Channel Selection, Boost, Master Selection (this amp has 2 switchable master volume controls) and the Effects Loop.

Did you ever get the footswitch accomplished with desired results?

John

[Hhabersat]

Thanks for following-up.
I did build the footswtich without any indicating LED's. It works well and my son, the actual user of the amp, is very happy with it.

[johnnieboy2]

Thought I'd post a few pics of my Super Goldtone, 30 watts Class A, 1x10" and 1x12". Currently using a 2 button footswitch, but wish I had the 5 button (non-latching) footswitch under discussion here.

[Hhabersat]

Sorry I didn’t get back to you sooner. As I mentioned before, my son has the amp at school. He finally brought the footswitch home yesterday so that I could take pictures. See the attached JPEGs.

It’s pretty simple:

Refer to the attached “Switching Circuitry” document. This has excerpts from the Schematic manual and describes how the switching works and gives a printout of the pins on the mini-din jack. The Trace Elliot amp supports two footswitches as shown on the diagram. Just reference one of them.
You basically short the appropriate pin to the ground pin , 0V, with a momentary switch to activate that function.
I bought the 8 pin mini-din plug from Fry’s. You can also order it from Mouser I believe.
I also bought the momentary switches from Fry’s. You can see from the picture of the inside of the footswitch that I am just using one switch per function then shorting the appropriate line to a common that is wired to the 0V pin as per the diagram.
I used heavy duty heat shrink tubing to reinforce the strain relief for the mini din plug since I saw this as a potential weak link.
For reference, attached is the manual and schematic for the Trace amp.






Post Construction Notes:

My son asked me to include his comments on the construction…

The switches are a little too close together (he has size 15 feet!)
The box is a little too tall.
Once I find a more suitable enclosure, I’ll probably rebuild it.



Hope this all helps; let me know how it works out for you.



Harold
Speed Twin II C100 & H100.pdf

SPTW.pdf

Switching Circuitry.doc

Footswitch Inside.jpg

Footswitch Top.jpg