Remember Pot Position and Bypass Status

Design Concepts
1

Hi,

This is my first post here. I’m not new to building analog circuits, but have no experience with programming or working with digital. I’m hoping that this might be the right place to ask for advice on where to start. I don’t know if any if the MIDIbox projects are remotely close to what I’d need for this.

I’m looking for a way to save knob settings and bypass (relay) status from an effects pedal. basically, I would like to have a circuit that does exactly this:

http://youtu.be/2XaV-XpgnEU

The only difference would be to be able to implement them into a couple different pedals.

Things that I do know:

The pedal would have a midi in connector to receive midi PCs.

The pcb would have to be small. Or I would have to be able to break it into different sections that could be connected externally.

There would be a switch added to the pedal that would allow me to save the current knob settings and bypass status to be triggered using the last PC# that was sent to the pedal.

I would take the potentiometers off of the original circuit and connect the pads to the midi controlled circuit. The midi controlled circuit would somehow replicate the resistance that would be set by the original potentiometers.

The bypass would use a dpdt relay and an LED to show the bypass status.

And this is about all I know so far! It’s very difficult to find any info on this and I’m not sure if it’s something that has been done in this way. If you can lead me in the right direction, I would really appreciate it. As of right now, I’m pretty overwhelmed by the sheer number of projects out there.

Thank you!

2

for switching things: “audio read relais” driven by a MB doutmodule: http://ucapps.de/mbhp_dout.html … or directly with the CORE Module http://ucapps.de/mbhp_core_lpc17.html  > Connector 10

 

digital pots > ask others… i also like to know that - but for that you need (software)drivers (not standard here…) - also it is difficult to get the exact Residance what you need, the common suppliers have no digital pots, and if they have the have only a few resistance values (10K 100k and so on)

maybe you must buy them direct from the semicounter manufactor (microchip, max, texxas instruments)… maybe you get free samples…maybe you must be  a lot of them? maybe you start a bulkorder here?..

3

I could go the motorized potentiometer route. Mouser has the Bourns motorized pots in stock, but they’re 2" deep. If I build a custom enclosure, that wouldn’t be too much of a problem.

4

i mean that: something like that with “digital pot”: http://uk.farnell.com/analog-devices/ad5262bruz200/ic-digital-pot-8bit-200k-dual/dp/1438437

in kombination with virtual Knob/Pot/Ledring or LCD with Encoder >

 

but ok you could also use those expensive motor-pots with a midibox MF-Module: http://ucapps.de/mbhp_mf_ng.html

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