Alan Stummer
Research Lab Technologist

D. McKay's Laser Lock



NOTICE: This webpage and associated files are provided for reference only. This is not a kit site!  It is a collection of my work here at the University of Toronto in the Physics department. If you are considering using any schematics, designs, or anything else from here then be warned that you had better know something of what you are about to do.  No design is guaranteed in any way, including workable schematic, board layout, HDL code, embedded software, user software, component selection, documentation, webpages, or anything.

All that said, if it says here it works then for me it worked. To make the project work may have involved undocumented additions, changes, deletions, tweaks, tunings, alterations, modifications, adjustments, waving of a wand while wearing a pointy black hat, appeals to electron deities and just plain doing whatever it takes to make the project work.

Overview & Disclaimer

For Joseph's lab.  This is a design of David McKay, a graduate from Joseph's lab.  I am simply making more.  Do not even begin to think that I had anything to do with this design, it is simply reproduced as given.  Either that or start from scratch.

Changes From Original

The following are changes made from the original units supplied as examples, the schematic and other files.

  • Added 5x20mm inline fuses to incoming ±15V
  • Common terminal on power connector goes to a terminal (was jammed under connector nut)
  • Increased clearance around TPs (still passes DRC without further change)
  • Wired front and back panel connectors, switches and pots directly to PCB (was Molex connectorized)
  • Guessed at many part numbers not listed
  • Used 0.4W resistors for front panel LEDs (was 1W)
  • Separated nonsensical connections between Piezo LED and connector X3 on front panel switch labelled as both X3 and INTRESETSWITCH on schematic and Piezo Error on faceplate
For the record, at ±15V, full assembly with all switches down and nothing connected draws +77mA and -69mA.

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