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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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mosc
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Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
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Posted: Fri Sep 08, 2006 4:48 pm Post subject:
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Hmmm... This will make an interesting pickup. You can probably use this as some sort of modulating pickup if you put in a signal on one winding and also place this next to a vibrating string or some other live metal object.
I have made neat pickups just winding transformer wire on little toy bar magnets. Hook up the pickup to a power amp of some sort and put the speaker very close to the strings in an old piano with the pedal held down. Then move the pickup in and approaching different strings. Makes beautiful music... _________________ --Howard
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Fri Sep 08, 2006 5:12 pm Post subject:
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Hmmmm,....
Very close Howard, you're on the ball. There's just one thing you overlooked. This little device contains no magnet, so it wouldn't make a very good pickup. _________________ What makes a space ours, is what we put there, and what we do there. |
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mosc
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Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
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Posted: Fri Sep 08, 2006 5:15 pm Post subject:
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OK, then put in a magnet.
Anyway, what do I get? a C-? _________________ --Howard
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Fri Sep 08, 2006 5:25 pm Post subject:
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This is the magnet!
If we pump the right signal into it.
There will be pickups, but they'll be somewhere else. _________________ What makes a space ours, is what we put there, and what we do there. |
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mosc
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Posted: Fri Sep 08, 2006 5:29 pm Post subject:
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What happens if you put DC through one of the coils and use the the other as a pick up? Wouldn't that work? _________________ --Howard
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
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Posted: Fri Sep 08, 2006 5:49 pm Post subject:
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Ahh... That will be cool. Good thinking... _________________ --Howard
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seraph
Editor
Joined: Jun 21, 2003 Posts: 12398 Location: Firenze, Italy
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Posted: Sat Sep 09, 2006 12:16 am Post subject:
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Uncle Krunkus wrote: |
Have you ever heard of an Ebow?
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http://www.ebow.com/ _________________ homepage - blog - forum - youtube
Quote: | Don't die with your music still in you - Wayne Dyer |
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Sat Sep 09, 2006 2:20 am Post subject:
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Does anyone know what they mean in that schematic about a "telephone pickup"? I have an idea of what it looks like, but I haven't seen one for years. I may end up winding my own. _________________ What makes a space ours, is what we put there, and what we do there. |
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DrJustice
Joined: Sep 13, 2004 Posts: 2114 Location: Morokulien
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Posted: Sat Sep 09, 2006 3:18 am Post subject:
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Telephone pickups are air wound coils with a fair number of windings. Can't remember the specifics; this was something I messed with for novelty as a kid.
DJ
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Sat Sep 09, 2006 3:59 am Post subject:
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Yeah,
I think that's the last time I saw one too. Along with carbon microphones, they were all a part of the, "now how does this old telephone work?" phase. Oh, they were the days! _________________ What makes a space ours, is what we put there, and what we do there. |
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Sat Sep 09, 2006 4:23 am Post subject:
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I've just taken apart one of those magnetix bars (the toy with ball bearings and magnetic bars for building geometric shapes) and found that they have a beautiful little rare earth magnet in each end. It's about 4mm round and 1.5mm thick. Now with the wire from an old guitar pickup, I should be able to wind my own little pickups which could be soldered directly onto a piece of stripboard.
I want the whole thing to fit onto a piece of stripboard so it is small, has no interconnecting wires, and the magnetised tines will be vibrating directly above the rest of the circuit! Ultimately, an electro-mechanical effect which just can't be emulated in the digital realm is what I'm aiming for.
The tines BTW will be tunable so you can setup different kinds of resonance depending on what you like. I've also worked out a way to mechanically interconnect tines, using small tension springs, so that they contaminate each others resonance. This would result in a less harmonic sound. And even though it will be small, I think I can still get the resonance frequencies down by weighting the tines.
Does anyone have any suggestions as to how small I could make the impedance of the pickups and still get something worth amplifying? A guitar pickup is in the range of about 4K to 12K.
An electro-magnet's strength is directly based off Ampere-Turns isn't it? So for any particular strength of magnet, the signal level should be proportional to the number of turns yeah? _________________ What makes a space ours, is what we put there, and what we do there. |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
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Posted: Sat Sep 09, 2006 6:03 am Post subject:
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The strength would be directly proportionaly to ampere-turns except that as the wire gets farther from the core it becomes less efficient. With stuff like this, experimentation is the best way to go. _________________ --Howard
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Sat Sep 09, 2006 7:22 am Post subject:
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I just built a pickup in the space of about an hour. But it only has an impedance of about 50R. I don't think that is enough. Still it goes to show that they are fairly easy to knock together.
Edit;
I thought I might as well test it anyway, and hand held in front of a bass guitar string it consistently put out 50uA or more. Is that something that can be worked with? _________________ What makes a space ours, is what we put there, and what we do there. |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
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Posted: Sat Sep 09, 2006 9:19 am Post subject:
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Uncle Krunkus wrote: |
I thought I might as well test it anyway, and hand held in front of a bass guitar string it consistently put out 50uA or more. Is that something that can be worked with? |
Depends on your preamp... _________________ --Howard
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Sat Sep 23, 2006 4:12 am Post subject:
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Does anyone know how to make a basic distribution amp?
I want to make 4 copies of the above 386 based E-bow circuit and have them fed by the one audio signal. I'd like to control the level going to each.
I thought of just buffering the signal through an op-amp and put the output across 4 pots (value?). Take the wiper of each pot through another buffer op-amp of it's own and that's it.
How does that sound? _________________ What makes a space ours, is what we put there, and what we do there. |
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mosc
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Posted: Sat Sep 23, 2006 7:59 am Post subject:
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Sounds good to me.
That's 5 op amps. You could use dual quads and with the extra op amps add a tone control - might be useful in such a set up.
Actually, I don't see why you need buffer amps at all. the 386 already will give you a good line lever signal. _________________ --Howard
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Uncle Krunkus
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Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Sat Sep 23, 2006 3:05 pm Post subject:
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So could I feed 4 * 386s from the wipers of the level pots directly?
I was thinking about attenuverters as well. Maybe I could put them where the individual buffers would go. I need to get out the breadboard. _________________ What makes a space ours, is what we put there, and what we do there. |
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slabman
Joined: Sep 01, 2005 Posts: 102 Location: UK
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Posted: Fri Feb 01, 2008 2:43 am Post subject:
Maybe use a piezo pickup? |
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Kind of a reinvention of spring reverb? Sorry - I ahd to say it! Anyway, you might consider using a piezo pickup to retrive the signal from the tines. That avoids any chance of the input & output transducers getting directly coupled by their magnetic fields. |
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KnobHell
Joined: Jan 28, 2012 Posts: 56 Location: SLC
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Posted: Thu Mar 28, 2013 8:29 pm Post subject:
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So how did this project turn out? Did you get you DIY ebow working?
Len |
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analog_backlash
Joined: Sep 04, 2012 Posts: 393 Location: Aldershot, UK
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Posted: Fri Mar 29, 2013 5:36 pm Post subject:
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Been out all day, so I'm a bit late joining in here.
Uncle Krunkus wrote: | Does anyone know what they mean in that schematic about a "telephone pickup"? I have an idea of what it looks like, but I haven't seen one for years. I may end up winding my own. |
These are still available in the UK, e.g. on Amazon:
http://www.amazon.co.uk/Telephone-Pickup-Coil-Suction-Cup/dp/B0034YMDL8
I'm sure that there must also be Australian sources.
I guessed it was an Ebow (honest) as I've thought about trying it myself. I was put off by comments online along the lines of "you can't build one yourself that's as good as the professional version". I give up too easily Also, my coil winding experience is pretty much confined to ferrite rods for crystal sets and to one (very simple) BFO metal detector. I've wondered if I could convert the latter into something "musical".
Anyway, I'll be really interested in the results,
Gary |
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