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Entry  Thu Jul 18 21:45:36 2013, Charles, Update, ISS, ISS - Full Schematic 40mServo_v1.pdf
    Reply  Wed Jul 24 22:58:03 2013, Charles, Update, ISS, ISS - Full Schematic - Updated 40mServo_v1.pdf
       Reply  Fri Jul 26 22:19:24 2013, Charles, Update, ISS, ISS - Full Schematic - Updated 40mServo_v1.pdf
Message ID: 8920     Entry time: Wed Jul 24 22:58:03 2013     In reply to: 8876     Reply to this: 8928
Author: Charles 
Type: Update 
Category: ISS 
Subject: ISS - Full Schematic - Updated 

 I have made significant changes to the ISS schematic, mostly in the form of adding necessary subsystems.

Some changes I have made:

  • Added a front page with sheet symbols that are representations of the other schematic sheets.
  • Added an 'Excitation' subsystem for use in determining the closed-loop transfer function
  • Added an instrumentation amplifier (with ADA4004s at Rana's recent suggestion) to handle the differential input from the PD
  • Included a switchable inverting amplifier (Gain of 1 or -1) to ensure we have the correct polarity
  • Made it so the first filtering stage is immediately active when the ISS loop is closed
  • Added LP filters with large time constants to buffer/delay trigger signals
  • Added test points all over the board
  • Refined a few buffer amplifiers

On the front page, all inputs and outputs are currently BNC ports, although this is most likely not the final design that will be used. For instance, the ports ENABLE, INPUT GND and INVERT are supposed to be logic inputs for a MAX333a switch. These will most likely be front panel switches that either connect the switch's logic pin to GND (Logic 0) or something like a +5 V supply (Logic 1).

I also have not included power regulation for my board although I have some of the actual D1000217 Chasis Power Regulator boards and I'll incorporate those in my design soon.

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