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Calculating Input Impedance and Load Impedance

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Nescafe

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Hi all,

I'm new here and this is my first post.

I have play with the state variable filter recently and need assistance or help to determining the impedance of the partial circuit.

Could someone please tell me how to calculate the load and input impedance (the formula) from two schematics that I attached and what I need to calculate are:
- output load for U1a pin 1 and U1b pin 1
- input impedance for U2a pin 3, U3a pin 3, U2b pin 5, U3b pin 5
- assuming the C impedance is constant to make it easier



Thank You
 

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