- #1
ccooll
- 4
- 0
Hi, I've had a good search around here and cannot find the answers to my questions elsewhere on the forum so here goes...
I'm getting ready to build a 'sustainer' for electric guitar based on developments described in a monster thread on the project guitar forum:
http://projectguitar.ibforums.com/index.php?showtopic=7512
The folks there seem to have done a lot of work, and have had some great success.
My problem is that I like to understand why things work, and no one over there seems to have any convincing theories as to why certain things work and why others don't.
The system is conceptually simple. The guitar bridge pickup is fed into an preamp/amp which powers an electromagnetic coil driver in the neck pickup position.
So far the only really successful design uses a shallow (3mm) coil about 60mm long and 12 mm wide with a 3x3mm 'blade' core
with either some little magnets under it, or the magnets from an existing pickup. The impedence is ~8ohms. the winding wire is 0.2 - 0.25mm
The designer believes that this thin coil allows a faster transition as the signal changes the polarity of the magnet, giving it a much better trebble response, and fewer issues with phase delay.
He also 'thinks' that the narrow core and 0.2mm wire are crucial.
What I want is a better understanding of the relationship between the dimentions of the coil, the diameter of the wire, number of turns, core material etc. and how these variables effect the speed that the coil can respond to changes in a signal.
I'd also like to know how they effect the phase of the signal across the frequency spectrum
Another major issue in this project is feedback caused by EMR from the driver being detected by the pickup. If i can start to understand the answer to my question above, I should get a better idea if it would be possible to create some sort of stacked 'humbucker' that can cancel much of the EMR feedback without having a significant effect on the frequency response and +- transition response time.
I've been looking at the latest developments in stacked Humbucker pickups - they use two quite different coils, one to sense the string, and the other to cancel the noise - look down this page:
http://www.kinman.com/html/myProducts/strats.htm
Thanks, and apologies for my limited ability to describe this issue :)
Col
I'm getting ready to build a 'sustainer' for electric guitar based on developments described in a monster thread on the project guitar forum:
http://projectguitar.ibforums.com/index.php?showtopic=7512
The folks there seem to have done a lot of work, and have had some great success.
My problem is that I like to understand why things work, and no one over there seems to have any convincing theories as to why certain things work and why others don't.
The system is conceptually simple. The guitar bridge pickup is fed into an preamp/amp which powers an electromagnetic coil driver in the neck pickup position.
So far the only really successful design uses a shallow (3mm) coil about 60mm long and 12 mm wide with a 3x3mm 'blade' core
with either some little magnets under it, or the magnets from an existing pickup. The impedence is ~8ohms. the winding wire is 0.2 - 0.25mm
The designer believes that this thin coil allows a faster transition as the signal changes the polarity of the magnet, giving it a much better trebble response, and fewer issues with phase delay.
He also 'thinks' that the narrow core and 0.2mm wire are crucial.
What I want is a better understanding of the relationship between the dimentions of the coil, the diameter of the wire, number of turns, core material etc. and how these variables effect the speed that the coil can respond to changes in a signal.
I'd also like to know how they effect the phase of the signal across the frequency spectrum
Another major issue in this project is feedback caused by EMR from the driver being detected by the pickup. If i can start to understand the answer to my question above, I should get a better idea if it would be possible to create some sort of stacked 'humbucker' that can cancel much of the EMR feedback without having a significant effect on the frequency response and +- transition response time.
I've been looking at the latest developments in stacked Humbucker pickups - they use two quite different coils, one to sense the string, and the other to cancel the noise - look down this page:
http://www.kinman.com/html/myProducts/strats.htm
Thanks, and apologies for my limited ability to describe this issue :)
Col