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schism
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« Reply #15 on: January 10, 2005, 10:14:12 PM » |
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well, why is it only feeding back in the heel position? theres very little blend difference. anybody have pics or any thing the least bit visual (checked the articles/ tutorials, didnt help much at all.)
sorry, for the trouble, ive just been trying at this for a while. the results have yet to be near desirable. thanks, though.
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expanoncolin
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« Reply #16 on: January 11, 2005, 10:31:48 AM » |
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well, why is it only feeding back in the heel position? theres very little blend difference. anybody have pics or any thing the least bit visual (checked the articles/ tutorials, didnt help much at all.)
sorry, for the trouble, ive just been trying at this for a while. the results have yet to be near desirable. thanks, though. Because in the "heel" position you are getting as little feedback resistance as possible, making the input go into the output with very little in its way and thus making it easy to feedback. Use a distortion or other gain device, not a small stone, with the feedback loop... or some sort of gain device with the small stone. Then you will get feedback at more settings. This is because the "gain" of the device helps it amplify on itself and feedback. You might want to consider wiring the 500k pot in the feedback loop pedal itself and wiring a seperate 10-100k or so pot inside the volume pedal in SERIES with the 500k pot. Because different pedals change the way feedback loops work an act, exact values are hard to say. However, putting a gain box in the loop always always helps to the point that it is a necessity. -Colin |
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schism
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« Reply #17 on: January 11, 2005, 06:09:01 PM » |
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i was using an eq which boosts the signal quite a bit (it overdrives my amp) and tried it with a grunge and a fabtone.
same results.
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expanoncolin
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« Reply #18 on: January 12, 2005, 07:02:39 AM » |
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i was using an eq which boosts the signal quite a bit (it overdrives my amp) and tried it with a grunge and a fabtone.
same results. Try a lower value potentiometer. You also may have wired it incorrectly (could be that instead of being wired as side lug, center lug, side lug, it is wired as center, side, side, which would make a bit of sense). -Colin |
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schism
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« Reply #19 on: January 13, 2005, 06:18:25 PM » |
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i tried every possible wiring combination and used resistors and got nothing....
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expanoncolin
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« Reply #20 on: January 14, 2005, 10:46:27 AM » |
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It also occured to me the volume pedal probably has a logarithmic taper pot... meaning that instead of having the range go evenly one way or another, it's very skewed to once side. If a linear taper pot goes ABCDEF then a logarithmic taper would go ADFFFF if that makes sense.
Does it work well just using a 500k pot, no volume pedal or anything?
-Colin
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« Reply #21 on: January 14, 2005, 12:17:39 PM » |
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yeah, i realized that last night. but wiring still seems to be an issue. it works with a normal 500k pot. both linear and audio taper.
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expanoncolin
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« Reply #22 on: January 14, 2005, 12:48:31 PM » |
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yeah, i realized that last night. but wiring still seems to be an issue. it works with a normal 500k pot. both linear and audio taper. Well, what I think is happening is that the jacks are chassis grounding (are they both metal? Is one of them metal?) so that instead of just having a variable resistance you have either a variable resistance and a resistance to ground or JUST the resistance to ground, which would quickly put your feedback loop to a halt unless you had VERY little resistance and LOTS Of resistance to the ground. This is explained a bit too in the expression pedal post. Try replacing with plastic jacks if you haven't already. (why didn't I think of this earlier?) -Colin |
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kingconga42
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« Reply #23 on: January 14, 2005, 12:56:57 PM » |
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if you find a pedal that works nicely with the feedback loop, it wouldn't be too hard to just wire the loop into the pedal itself, if you have enough room to mount a new pot.
-justin
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« Reply #24 on: January 14, 2005, 07:57:25 PM » |
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at the moment, im using the case from a rogue volume pedal... the jacks im using are metal... im going to get another rogue and turn it into an always on feedback loop with expression. theyre only like $15 on musicans friend, have alot of space inside andalready have holes for four jacks. it also has a minimum level taper slider, maybe work this in...
also, with this rogue vp, you can attach a capacitor to it and have a passive tone, with the right capacitor and distortion combo, it can get kind of wahish...
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expanoncolin
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« Reply #25 on: January 15, 2005, 05:21:45 AM » |
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Remember that the Bespeco pedals are cheap too  They also seem slightly more sturdy. If the jack was metal in your feedback loop case then it's quite probable that was the problem. -Colin |
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Coronado
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« Reply #28 on: February 07, 2005, 05:55:12 PM » |
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Thanks Colin. The problem is I don't have a 3PDT, maybe later I'll order some but now I only have DPDT. A few lines including the jacks on the schematic would help. (Sorry again, you can name the it "Feedback Looper for Dummies")  |
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expanoncolin
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« Reply #29 on: February 08, 2005, 11:07:18 AM » |
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Well, in terms of the jacks, that depends on if you are using stereo (they will have 3 solder lugs) or mono (2 solder lugs). Let me know and I can draw a diagram or something.
-Colin
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