Galvo

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Galvo

Objectives

As a followup to my previous efforts to control a CRT, I have resurrected a setup that I did quite a long time ago to control a laser beam. I have done several attempts, using a handmade galvo and a moving mirror.

Here are picture of the two setups:

Galvo carbon triangular 3.jpg
Galva mockup.jpg

There are also two short videos here and there .

Needless to say, these attemprs were unsuccessful. So I ended up buying a readymade mage galvo from China (simlilar to this one). The galvo comes with a +15/-15v power suply and two drivers (one for each mirror).

The only things that remain to be done are

  • to generate the ILDA signals to drive the mirrors (via the drivers) from two 0-5v signals generated by an Arduino micro and a couple of DACs (this is explained below).
  • to write the piece of software to the generate patterns to display.


Schematics

The schematics is basically the one proposed at [1].


Galvo2021 schematics.jpg

Please note that the 5V used for the microcontroller / DACs is obtained from the 15V power supply. I am not sure that a genuine 7805 will appreciate the 10V shift... So I'll use some of the nice 3-pin step-down replacements such as:

Galvo2021 5v step down.jpg

Breadboard

The initial setup has been done on a breadbord. As usual, this is a real mess.

Galvo2021 breadboard-1.jpg


Galvo2021 breadboard-2.jpg


Galvo2021 breadboard-3.jpg


Galvo2021 breadboard-4.jpg


Galvo2021 breadboard-5.jpg


PCB

Galvo2021 pcb-top.jpg


Galvo2021 pcb-bot.jpg


Galvo2021 pcb-brd.jpg
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