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MM01

Page history last edited by Noah Vawter 2 years, 10 months ago

MarkII

 

MM_01 on gdrive (new)

MM_01 on gdrive (old)

 

Generator Measurement

 

Current Measurement Board

 

 

 

ACS722

 

LM321 Op-Amp

 

 

Timmer Potentiometer

     TSR-3386U,EY5-10k-

     pin spacing 0.100" 

     .375" square on each side

 

Timmer Potentiometer search

* https://www.digikey.com/products/en/potentiometers-variable-resistors/trimmer-potentiometers/80

Two Candidates:

* https://www.digikey.com/product-detail/en/adafruit-industries-llc/356/1528-1997-ND/6827130

     Data sheet not correct?

 

* https://www.digikey.com/product-detail/en/sparkfun-electronics/COM-09806/1568-1616-ND/7319606

 

 

Digikey Order

 

 

ACS712

Obsolete, less accurate version of 722.  BUT important thing is the amplifier schematic is in this datasheet, and not the ACS722 datasheet!!!!!

 

 

Other

 

 

Voltage Measurement

  • R1 = 10k
  • R2 = 220k
  • gain = R1 / ( R1 + R2 ) = 10/230 = 0.0434782608695652

 

PCB Design

  • 5 current channels
  • buffered mid-point voltage
  • six op-amp stages total, recommend two 4-channel ICs
  • two channels for buffering voltage measurement?

 

Software

Software on mbed

 

 

References

http://www.maximintegrated.com/en/app-notes/index.mvp/id/746

http://www.ti.com/lit/an/slva385/slva385.pdf

 

 

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