expanoncolin
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« Reply #495 on: September 23, 2011, 07:02:29 AM » |
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Nice - these should be helpful to those who want to learn the effect of a feedback loop.
-Colin
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mick_ccc
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« Reply #496 on: September 23, 2011, 01:18:37 PM » |
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yes, it was the purpose of it!  Thanks! |
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mick_ccc
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« Reply #497 on: September 23, 2011, 02:44:28 PM » |
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I just saw a demo of the Ohnoho Utter Stutter, it's awesome!! Does anyone knows how this variable rate feedback looper is achieved? If you don't know it, here it is: http://www.youtube.com/watch?v=VJR3hRmkWl8 |
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expanoncolin
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« Reply #498 on: September 23, 2011, 03:49:37 PM » |
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It's just a feedback loop with the feedback pot replaced by a vactrol, or other voltage-controlled resistance element, being controlled by an LFO of some kind. -Colin |
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mick_ccc
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« Reply #499 on: September 25, 2011, 10:12:23 AM » |
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Thanks! And would you have in mind some schematics to do this kind of things? |
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expanoncolin
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« Reply #500 on: September 27, 2011, 06:25:45 AM » |
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Thanks! And would you have in mind some schematics to do this kind of things? The topic of voltage-controlled resistance has come up many times on the forum. Search for H11F3 or vactrol. The basic idea is that you'll need to wire up an LFO to a vactrol (or similar device), and replace the feedback loop's pot with the vactrol's variable resistance element. -Colin |
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mick_ccc
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« Reply #501 on: September 29, 2011, 10:32:40 AM » |
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ok, thanks!! I'll search for this!
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mick_ccc
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« Reply #502 on: October 14, 2011, 12:54:47 AM » |
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Hi Colin and all! Do you think it could be usefull and safer to add some hard clipping diode at the output of a feedback looper to prevent it from getting too loud and eventually blow the user's ears and his amplifier? Have you already tested it? Or ddo you think it makes no sense? Thanks! Mick |
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expanoncolin
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« Reply #503 on: October 14, 2011, 09:11:01 AM » |
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It might work - the main issue being that it may completely inhibit feedback.
-Colin
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mick_ccc
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« Reply #504 on: October 17, 2011, 07:51:43 AM » |
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ok thanks, I have to test. No one has ever tried here? |
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mick_ccc
phpBB Junior Member
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« Reply #505 on: November 20, 2011, 06:02:32 AM » |
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Hi Colin and all,
I have another question about feedback looper.
I've tested both schematics given here, the one with momentary switch and the one without it.
It works really great, the only thing is that generally we get the effect of feedback looper quite far in the potentiometer range, I mean generally it starts to have effet from 12'oclock to max.
It is what I have with the "non momentary" one. With the momentary one, it's even worse, it starts oscillating at 3'oclok to max, to the range is not very user friendly.
Do you know what I have this different behaviour for both schematics?
How could we improve this to have a more progressive effect on the feedback looper all along the pot range?
Thanks and regards (and sorry for bad english),
Michael
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expanoncolin
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« Reply #506 on: November 20, 2011, 06:22:54 PM » |
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Try different (lower) potentiometer values. The response will vary depending on the pedal you're using.
-Colin
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mick_ccc
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« Reply #507 on: November 22, 2011, 04:46:07 AM » |
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ok, I'll try thanks.
Any idea why, with the same value (500K) of pot, and with the same pedal inside the loop, I get different behaviour with the schematics with momentary switch, and with the one without it?
Thanks!
Michael
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expanoncolin
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« Reply #508 on: November 22, 2011, 08:14:29 AM » |
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Either one pot is a linear taper and the other is audio, or there is some wiring issue. The switch should not make any difference assuming it is not broken.
-Colin
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mick_ccc
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« Reply #509 on: November 23, 2011, 05:33:55 AM » |
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Normally, both pots are 500K log, but I'll check again.
Thanks!
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