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General => General Chat => Topic started by: jp1390 on December 11, 2012, 03:53:33 am

Title: Best way to measure guitar pickup impedance response?
Post by: jp1390 on December 11, 2012, 03:53:33 am
Hi just wondering if anyone has a good suggestion for measuring and plotting the magnitude of the impedance at different frequencies of a guitar pickup.

So far I have used a function generator in series with a known resistance R and my pickup connected through the input jack and cable and played around with different frequencies.

At each frequency I measure the voltage across both R and the pickup and I can find the current as Vr/R and since the pickup is in series with R I can find out what the impedance is: |Z| = Vpickup/I for different frequencies.

Wondering if anyone has another idea on performing this measurement.

Cheers,
JP
Title: Re: Best way to measure guitar pickup impedance response?
Post by: T4P on December 11, 2012, 05:02:13 am
Sweeped frequency response graph - like dave has just demonstrated on saturday, friday if you live in the states
Title: Re: Best way to measure guitar pickup impedance response?
Post by: jp1390 on December 11, 2012, 07:44:32 pm
I have to sweep frequencies but my question is more related to ideas on what kind of connection to the AC source should my guitar pickup have. Right now I am connecting my AC source to the patch cord (connected to the pickup) and measuring impedance that way, but it is neglecting the effect of the strings.

Any more suggestions?
Title: Re: Best way to measure guitar pickup impedance response?
Post by: kaindub on December 13, 2012, 10:57:15 am
Have a look at this site
http://buildyourguitar.com/resources/lemme/ (http://buildyourguitar.com/resources/lemme/)
i think it will tell you everything you need to know
Now constructing the test equipment may be a bit more difficult

Robert