Hi,

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: http://imageshack.us/photo/my-images/42/pid.png/

 

Tuning PID loops can be a tricky and sometimes difficult process. A Google search turned up many articles on that. I suggest you read a few to get familiar with what is required.