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How to shield the ER-2 Headphones

How to shield the ER-2 Headphones. Dr. Jengs Lab. First remove the Velcro strip from the black box Remove sound tube. Next remove the 5 screws with a small flat head screwdriver. Open and tape box onto a secure surface to prevent small wires from ripping. Important wires!!

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How to shield the ER-2 Headphones

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  1. How to shield the ER-2 Headphones Dr. Jengs Lab

  2. First remove the Velcro strip from the black box • Remove sound tube

  3. Next remove the 5 screws with a small flat head screwdriver

  4. Open and tape box onto a secure surface to prevent small wires from ripping Important wires!! Be very careful opening/moving box Secure Box (surface)

  5. Peel back tape to view copper spring/wires

  6. Cut copper wires at stared locations • Bend wires away from box, indicated by arrow • These parts will be removed

  7. Chip or file down black plastic to make room for larger black wire • Note: at this point gold springs will be cut, picture not accurate

  8. Using Cable strippers cut open black wire exposing conductive grey, white, and blue wires. • Use cable strippers to remove protective rubber on blue and white wires • Solder white and blue wires onto gold wires • Make sure all conductive (grey) wires are pulled back outside of box • Picture not accurate, gold springs will be sticking out and not completely removed like current picture, see slide 6

  9. Secure soldered wires by using epoxy glue • Be sure to allow proper time for epoxy to harden • Twist grey wire together

  10. Solder white wire to top portion of ¼ jack (soldered on left gold spring inside black box) • Solder blue and grey wires to bottom portion of ¼ jack

  11. More on wiring

  12. Tape wire with electrical tape to protect wires

  13. Screw box back together making sure grey conductive wire is still outside the box

  14. Solder black wire to the grey conductive wire • Use electrical strippers to strip end of wire • Reattach sound tube

  15. Use template measurements to cut CO-NET AA sheet • Thickness of CO-NET AA sheet: 0.002”

  16. A pre-cut template can be found in box containing shielding material • Once cut, Form shielding material around box • Make sure wire is not being rubbed/cut by sharp pieces of shielding material

  17. To test shielding plug 3 electrodes into the Neuroscan system.

  18. Connect alligator clamps to electors and to the resistors. Resistor used should be ___ohms • Secure alligator clamps to table with tape

  19. To test impedance with shielding put the shielding material on box secured by tape • View impedance levels with the ground not touching the shielding material • Then touch the black wire to the shielding material and see if impedance levels improve

  20. If impedance is reduced: • Solder case together • Solder black wire to case

  21. Wrap boxes in electrical tap • Label ER-2 • Wrap excess black wire

  22. New Epoxy method • The spring coils inside were preserved and tined. • The two conductors of the shielded cable are tined and inserted into the tow “chambers”, separately. • solder the tined coil and conductor within each chamber. Make sure the solder does not overflow into the other chamber. • Use Epoxy to fill out the entire two chambers. Also, use Epoxy to consolidate the exposed segments of the two conductors.

  23. E Epoxy

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