Author |
Message |
Inventor
Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
|
Posted: Sat Sep 27, 2008 8:42 am Post subject:
Guitiar Negative Impedance Converter Subject description: Just an idea |
|
|
Hi, I came up with an idea for a guitar pedal box. It is very simple, you build a negative impedance converter and in place of one of the resistors you put a duplicate of your guitar's pickup. In my paper calculations, the negative impedance can be made to cancel out the source impedance of your pickup, thereby leaving a flat pickup response. What do you think of this idea? Will it work? Has it been done before? Stoopid or kewl? _________________ "Let's make noise for peace." - Kijjaz |
|
Back to top
|
|
|
Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
|
Posted: Sat Sep 27, 2008 8:47 am Post subject:
|
|
|
What's a negative impedance converter? _________________ What makes a space ours, is what we put there, and what we do there. |
|
Back to top
|
|
|
blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
|
Posted: Sat Sep 27, 2008 10:21 am Post subject:
Re: Guitiar Negative Impedance Converter Subject description: Just an idea |
|
|
Inventor wrote: | In my paper calculations, the negative impedance can be made to cancel out the source impedance of your pickup, thereby leaving a flat pickup response. |
Would it not oscillate easily? _________________ Jan
also .. could someone please turn down the thermostat a bit.
|
|
Back to top
|
|
|
blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
|
Posted: Sat Sep 27, 2008 10:25 am Post subject:
|
|
|
Uncle Krunkus wrote: | What's a negative impedance converter? |
Some info on it : http://en.wikipedia.org/wiki/Negative_resistance - impedance would be generalized resistance, adding an "imaginary part" to it - making the numbers complex. _________________ Jan
also .. could someone please turn down the thermostat a bit.
|
|
Back to top
|
|
|
Inventor
Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
|
Posted: Sat Sep 27, 2008 11:29 am Post subject:
|
|
|
Aye, this be the beastie:
http://en.wikipedia.org/wiki/Negative_impedance_converter
You can replace either R1 or R3 with the pickup. In my calculations I put the pickup in place of R3, though that might not be the correct place. R1 might be better.
It might be prone to oscillations, yes. That could be it's Achilles heel. It might be possible to dampen those oscillations. Perhaps the tone control knob would dampen them.
The beauty of using a pickup to cancel a pickup's source impedance is that all impedance characteristics, including the distributed nature of the impedance, could perhaps be accounted for automatically. Or not, I'm not certain but that's my guess. _________________ "Let's make noise for peace." - Kijjaz |
|
Back to top
|
|
|
|