Galvo
From Eric
Contents |
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:
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].
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:
Breadboard
The initial setup has been done on a breadbord. As usual, this is a real mess.
PCB