Analog PID Controller Project

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Joined Oct 14, 2011

I need some help on how to build an analog PID Controller (closed Loop) for DC motor with tachometer from scratch. I attached the link of the block diagram of the whole design. I already built the two low pass filter. The first low pass filter has cutoff freq = 4 kHz and the other vary from 100 Hz to 1 kHz before the difference circuit. I used a butterworth response. I will be using single supply op amp (AD8**) for the whole design.
The speed of the motor can go up to 4 kHz.

I am wondering how can I build or compute all the components value for my PID controller(proportional,integrator, differentiator) , difference circuit, summing circuit, and buffer circuit?
I've been searching online about the set up of PID controller with difference circuit, summing circ, buffer circuit.

Where do I start from here?

Can anyone guide me to the step by step process of building this design?
Because I am really new of how to build a closed loop PID controller.
Thank you for any help.

here is the link for the block diagram:
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