Results 1 to 7 of 7

Thread: schematic for a GM20 driver

  1. #1
    Join Date
    May 2007
    Location
    Romania
    Posts
    1,039

  2. #2
    mixedgas's Avatar
    mixedgas is online now Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,468

    Default

    Quote Originally Posted by andyf97 View Post
    Anyone got a schematic diagram for a GM20 actuator drive circuit.
    You want damping for speed or just simple driver?

    if you want damping and speed use:

    general scanning a102 circuit

    http://www.gs-scanners.com/pdfs/manuals/A102_AX200.pdf


    if not,and looking for single supply driver with no ringing use a IR740 FET with a fet gate driver chip such as Texas Instruments TPS2811 , remember to put schottkey reverse diodes across the actuator and across the fet

    Steve

  3. #3
    Join Date
    May 2007
    Location
    Romania
    Posts
    1,039

    Default

    Just a simple shutter control, nothing fancy.

    so to take the ILDA shutter signal and drive the GM20 top open a beam.

  4. #4
    Join Date
    May 2007
    Location
    Romania
    Posts
    1,039

  5. #5
    mixedgas's Avatar
    mixedgas is online now Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,468

    Default

    Quote Originally Posted by andyf97 View Post
    I was thinking something like this..

    That works, use a darlington and a big heatsink/

    We also sometimes place about 20-40 ohms across the galvo for some damping, as well as the diode.

    cheers,\

    Steve

  6. #6
    Join Date
    May 2007
    Location
    Romania
    Posts
    1,039

    Default

    Quote Originally Posted by mixedgas View Post
    That works, use a darlington and a big heatsink/

    We also sometimes place about 20-40 ohms across the galvo for some damping, as well as the diode.

    cheers,\

    Steve
    I think it should too, I like to use the word should.

  7. #7
    Join Date
    Apr 2006
    Location
    Orlando, FL - USA
    Posts
    1,767

    Default

    By the way, 1K is pretty low impedance... It would be better to use a higher impedance. A darlington allows you to do that.

    I sent a hand drawing to Mike from MechEng3, who had good results with it. He posted a re-drawn version in another posting. Perhaps you can dig for it, or someone will re-post it.

    Bill

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •