Marshall 9000 preamp - footswitch modification
built date - 19.04.1989
Because the original footswitch does not exist anymore, I must build another one, to do the channels switching job.
Some "Alpha" type potentiometers need to be replaced
I have another Marshall 5 channels footswitch, so I must modify. The modified footswitch must do the jobs as follow:
New footswitch pedal schematics was built
- switch on 3 channels with just one single button push (the last command will remain valid)
- switch 2 channels with on/off buttons
- new PCB building, must be carefully - switches and diodes must go to same holes from pedal
- PCB released with Eagle
- populated PCB artwork
- command voltage and wiring connectors for old footswitch pedal
- connector wiring, assembling and mounting on his place
- voltages and command in new pedal
- first on/off commands (2 x non retour switch)
(under construction)