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kurtlives
PostPosted: Sun Jul 11, 2010 4:27 pm 
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The following schematic is a circuit that allows the Tramp to select either Tweed or Tude mode via a foot-switch. The circuit uses a single 5V relay with both poles being used. If no foot-switch is available or simply not plugged in the modes can be toggled by the volume push-pull switch (just like stock).

The circuit taps an AC voltage off the heaters, rectifies it to DC, regulates it and has lots of filtering in between. The circuit does not add any extra noise, it is quiet and has no induced popping. Quiet simple circuit and fairly easy to implement in the Tramp.

Click to enlarge...

Image

Image



Hopefully later Stephen can snap a few pics of a Tramp with foot-switching abilities.

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coco
PostPosted: Mon Jul 12, 2010 9:32 am 
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Yes, it works well. kurtlives did a good job. Note that the jack MUST be insulated from the chassis.
I'll get some pictures together soon.

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Ooops
PostPosted: Mon Jul 12, 2010 11:09 am 
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Thank you so much!!
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kurtlives
PostPosted: Mon Jul 12, 2010 12:10 pm 
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Should be noted the entire circuit is "floating". There is no AC ground, there is one signal ground but that is on the relay. The whole floating circuit thing is key to getting the PSU/switching to work.

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coco
PostPosted: Sat Aug 07, 2010 1:56 pm 
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View of Relay board installation
Attachment:
tramp_ footswitch.jpg
tramp_ footswitch.jpg [ 197.5 KiB | Viewed 6066 times ]


View of wiring from Output
Attachment:
tramp_ footswitch_install.jpg
tramp_ footswitch_install.jpg [ 135.73 KiB | Viewed 6066 times ]


Close up of Relay Board
Attachment:
tramp_ footswitch_board.jpg
tramp_ footswitch_board.jpg [ 106.12 KiB | Viewed 6066 times ]


View of Modifications to accommodate Foot Switch jack and Power Tube Bias switch.
Attachment:
tramp_ footswitch_rearview.jpg
tramp_ footswitch_rearview.jpg [ 65.65 KiB | Viewed 6066 times ]

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