Copyright © 1994-2021
Sam Goldwasser
--- All Rights Reserved ---
There are presently two available kits:
Quad-Sin-Cos Decoder Parts List
Prt# Qty Description ------------------------------------------------------------------- AP1 1 Variable attenuator plate used as adjustable NPBS CP1 2 Pieces of Circular Polarizer (CP) sheet (or cut) CS2 4 Microscope cover slips to attach CP pieces PD1 1 Photodiode for Sin/A channel PD2 1 Photodiode for Cos/B channel
The photo shows the typical optical parts and photodiodes.
R2 and R3 can serve as load resistors for the photodiodes if bandwidth is not critical, or as the feedback resistors for proper trans-impedance amplifiers. R1 is simply to protect the PDs should they be installed backwards, and the power supply should a PD fail shorted.
Here are the very long detailed parts lists. :) The numbering refers to schematic above:
Prt# Description Comments --------------------------------------------------------------------------- U1 LM393P, 8 pin DIP Dual voltage comparator U2 UA9638, 8 pin DIP Dual RS422 line driver LED1 LED, red Thresholded Sin, A LED2 LED, green Thresholded Sin, B R0 Resistor, 1K, 1/4W Photodiode protection R1 Resistor, 100K, 1/4W Sin (Channel A) load resistor* R2 Trim-pot, 10K Sin (Channel A) threshold R3 Resistor, 100K, 1/4W Sin (Channel A) trim-pot isolation R4 Resistor, 470M, 1/4W Sin (Channel A) hysteresis R5 Resistor, 2K, 1/4W Red LED current limiting R6 Resistor, 1K, 1/4W Channel A pullup R7 Resistor, 100K, 1/4W Cos (Channel B) load resistor* R8 Trim-pot, 10K Cos (Channel B) threshold R9 Resistor, 100K, 1/4W Cos (Channel B) trim-pot isolation R10 Resistor, 470M, 1/4W Cos (Channel B) hysteresis R11 Resistor, 47K, 1/4W Green LED current limiting R12 Resistor, 1K, 1/4W Channel B pullup