Results 1 to 5 of 5

Thread: Tuning unknown galvos

  1. #1
    Join Date
    May 2012
    Posts
    5

    Default Tuning unknown galvos

    Hey guys...

    I purchased a couple of inexpensive Chinese made RGB projectors off of Ebay a few years ago. The scanners have never been tuned optimally, but now they have drifted to the point of being unacceptable to me.

    This is the item I got...
    http://www.ebay.com/itm/Promotiom-10...item2a2692001c

    Unfortunately, they didn't come with any schematic for the amps showing what pot is which, so I'm sort of flying blind here.

    What I have figured out is that the twelve potentiometers in line are a "mirror" of the other channel. For example, the pot on the far left is the horizontal position (offset?) and the pot on the far right is the vertical. It will make better sense when you look at the photo and see how I've labeled them.

    I have thus far been able to label the position, size and gain pots, but I'm unsure about which are the high and low frequency damping, and then I'm unsure as to what the additional pot is for each channel.

    Does anyone recognize this projector and/or amps that can direct me to a schematic? If not, how can I determine what these other three pots are on each channel?

    Thanks reading and for any help/advice!

    Click image for larger version. 

Name:	IMG_20150827_172023.jpg 
Views:	44 
Size:	3.13 MB 
ID:	48271Click image for larger version. 

Name:	IMG_20150827_172103.jpg 
Views:	35 
Size:	3.23 MB 
ID:	48270

  2. #2
    Join Date
    Jul 2010
    Location
    Netherlands
    Posts
    3,245

    Default

    The galvos are from the same factory which makes the AL galvos.
    These galvos might be either AL20k or AL25k.
    I'm not at home (I am in IsraŽl with my girlfriend right now) but I will link the reverse engineered work of mine in a little bit (have it on my dropbox lucky you)

  3. #3
    Join Date
    May 2012
    Posts
    5

    Default

    Awesome! Yes, I believe the galvos are 20k.

    Anxiously awaiting your findings!

  4. #4
    Join Date
    May 2012
    Posts
    5

    Default

    Never mind! I found your awesome reverse engineering thread of these amps here -

    http://www.photonlexicon.com/forums/...nner-amplifier

    I was anxious and hit up Google! He he! :P

    Great work! And thanks! Going to tune these puppies to 30k!

  5. #5
    Join Date
    Jul 2010
    Location
    Netherlands
    Posts
    3,245

    Default

    That's it! C:
    I was hesitant of releasing it at first but I thought back that the community also does a lot for me so it was fair in my opinion to share it.

Posting Permissions

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