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 Forum index » Instruments and Equipment » Strings and things
Negative Impedance Converter
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Joined: Oct 13, 2007
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Location: San Antonio, Tx, USA
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PostPosted: Tue Oct 14, 2008 6:07 pm    Post subject: Negative Impedance Converter
Subject description: Cancelling Pickup Source Impedance
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Here is a thread I made earlier that could use some attention in strings and things. The idea is to use a negative impedance converter to cancel out the source impedance of a pickup. Here is the wiki on NICs:

http://en.wikipedia.org/wiki/Negative_impedance_converter

I would put the pickup on either R1 or R3, probably R1 for DC stability. I solved the circuit with the pickup in the R3 position a few weeks ago, and you get Vo = 1/(1-R2/R1) * Vs from the circuit. So if you make R2/R1 close to one you get a lot of gain, or if you set it with R2 = 2*R1 you get the source voltage Vs inverted, but without the effects of the source impedance.

What I would do is use an actual identical pickup to the one that's in the guitar, so all the parasitics and the actual impedance at every frequency would be automatically modeled exactly.

If I had a pickup I'd build the thing just to see if it works, but anyway what do you think of the concept? In theory it produces an ideal flat frequency response from a guitar - that could be quite a novel innovation if it worked, I imagine...

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