Help with frequency response of guitar tone circuit

AI Thread Summary
The discussion focuses on analyzing the frequency response of a Fender Stratocaster guitar circuit, specifically the transfer function and total impedance calculations. The user is attempting to derive the transfer function but consistently arrives at TF = 1, indicating a potential error in their calculations. They provide the formula for total impedance, Z_total, involving the tone and volume pots, but express uncertainty about the accuracy of their diagram and calculations. The user seeks clarification on whether their circuit diagram is correct and where their mistake might lie. Accurate analysis of the circuit's frequency response is essential for understanding its tonal characteristics.
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The circuit of interest is the basic circuit for a Fender Stratocaster guitar. A diagram can be found at http://www.seymourduncan.com/support/schematics/S_1singlecoil_1vol_1tone.html . Basically an electric guitar works by vibrating a metal string in a magnetic field. This in turn causes a current to be generated in the an inductor that is wrapped around the magnet.

What I'm trying to do is find the frequency response of this circuit. Whenever I try to calculate the transfer function for this circuit I get

TF = 1.

When I try to calculate the total impedance for this circuit I get

Z_{total} = \frac{Z_{1}Z_{2}}{Z_{1}+Z_{2}} = \frac{(R_{1} - j\frac{1}{\omega C})R_{2}}{R_{1}-j \frac{1}{\omega C}+R_{2}}

where
Z_{1} = R_{1} - j \omega C and Z_{2} = R_{2}.

To find the transfer function I calculate

TF = \frac{V_{in}}{V_{out}} = 1.

This is obviously incorrect, but I don't know where my mistake is. Is my diagram correct?
 
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My post is a litle confusing. I had an ACII diagram, but it did not get rendered the way I wnated it to. R2 is the volume pot, and R1 is the tone pot.
 
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