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Post by nick robinson on Feb 21, 2011 13:33:18 GMT
I've just been to our local electronic shop to pick up resistors for the pedal. The values given here www.loopers-delight.com/tools/echoplex/echopedals.htmlare 0 ohms Record 14.3K ohms overdub 7.87K ohms Multiply 4.75K ohms Insert 2.87K ohms Mute 1.58K ohms Undo 681 ohms NextLoop Not a single one was available, so I've got the nearest values and will see how they work. Whilst the concept of making a low-tech pedal is utterly brilliant, why on earth did they not choose more common values, 100k, 200k, 300k would surely have been simpler?? |
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Post by andybutler on Feb 25, 2011 14:07:28 GMT
Whilst the concept of making a low-tech pedal is utterly brilliant, why on earth did they not choose more common values, 100k, 200k, 300k would surely have been simpler?? I expect that the values are carefully selected to work with an ADC with low resolution. There *should* be a range of values that work, so I'd expect the nearest values you can get to be good enough. I can look through my electronic junkpile for you if there's one or two values that don't work. |
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Post by Stephen Scott on Mar 1, 2011 16:46:44 GMT
I got my resistors from Maplins (there seem to be 2 stores in Sheffield). If I recall, they didn't have all the values I needed in stock (they didn't have the 0 ohm  ), but I was able to cobble together the missing values by soldering little series/parallel networks. By doing this, I managed to get values within a few % of those quoted. If your controller doesn't work, I'd gladly send you the resistors from one of my 3 controllers, now unused. Is your FCB1010 being used to control something else then? |
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Post by andybutler on Mar 5, 2011 10:48:34 GMT
Just checked,
indeed the FC7 has those exact values.
...but I'd expect the nearest commonly available values would still work. Within 10% should be close enough.
..unless you found otherwise of course
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Post by nick robinson on Mar 6, 2011 15:19:12 GMT
I've decided I like the dedicated reverse & half buttons so much, I'm going to make a custom pedal using the arduino chip to convert foot switch presses into the appropriate midi values. midi out, plus expression pedal in for feedback I've picked up a cheap marshall fs and here's a mockup of what (I hope!) it will do. I've added leds for the functions where it seems useful Anything else you'd add for convenience?  |
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Post by andybutler on Mar 7, 2011 11:43:13 GMT
Anything else you'd add for convenience? A dedicated SUS-Substitute button. ...but note, that *won't* do 8th Quant, you have to use InsertMode for that. I think that's a very good selection however. How about next=Preset and prev-Preset buttons instead of the three selector buttons? Shouldn't be hard to program the Arduino to start at preset 1 and then add or subtract to doe the nexting. |
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Post by Stephen Scott on Mar 7, 2011 16:43:51 GMT
What a neat idea. I'm intrigued by the arduino chip - cost, supplier, how easy is it to program, etc, I need the info!
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Post by nick robinson on Mar 10, 2011 16:52:19 GMT
What a neat idea. I'm intrigued by the arduino chip - cost, supplier, how easy is it to program, etc, I need the info! chips around 12 quid (I got 3 from hong kong for 20), but this one has extra bits that look fun. cgi.ebay.co.uk/Arduino-DIY-Starter-Kit-Duemilanove-ATmega-328-LCD-/250778883616?pt=LH_DefaultDomain_3&hash=item3a63961620non-latching switches, leds dirt cheap. marshall box, a tenner off ebay (inc footswitches!) would love to find "blank" moulded cases so I didn't leave holes... coding - depends how much you value your time. I've got the logic & midi working, but having to learn about "debouncing" switches now Latest shot below - yes, it's a fricking mess, but once it's working, I can tidy up. I've used 1 input pin per switch, but using a matrix you can "read" a dozen or more switches with only three pins  I'm drawing up schematics which should help a lot! All in all, much fun |
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Post by nick robinson on Apr 2, 2011 17:14:23 GMT
Latest incarnation. It now works in terms of controlling the EDP. but I'm discovering all kinds of issues with making the leds go on & off when they should. For example, when you end a record phase by pressing reverse, you need the rev led on but rec light off. There are several such issues, but alone on stage, to know when I am recording, overdubbing, multiplying, rev or half saves faffing about looking at the rack each time to check  yes, it looks like diy sh*t, but once it's programmed properly, I can worry about that. Makes me admire Xavier all the more for his work with the gordius pedal range. |
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Post by andybutler on Apr 6, 2011 7:57:35 GMT
It would be very difficult to fully track the EDP state with the LEDs.
...pretty much impossible if you use NextLoop at all.
Rec is ended by any other button press.
Ovd isn't, except by Substitute.
Mult is ended by any other button, think you'll need to ignore the rounding.
HSP,Rev, and Ovd persist with the loop, that's why Next is a problem.
Every LED should be off for a long press of Rec
Hope you can find a close enough match to edp behaviour to suit your playing.
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), but I was able to cobble together the missing values by soldering little series/parallel networks. By doing this, I managed to get values within a few % of those quoted.