schematic for a GM20 driver

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07-07-2008, 09:29
andyf97

schematic for a GM20 driver

Anyone got a schematic diagram for a GM20 actuator drive circuit.
07-07-2008, 09:58
mixedgas

Quote:

Originally Posted by andyf97

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
07-07-2008, 11:03
andyf97

Just a simple shutter control, nothing fancy.

so to take the ILDA shutter signal and drive the GM20 top open a beam.
07-07-2008, 13:13
andyf97

I was thinking something like this..

http://www.lasershows.ro/temp/gm20.gif
07-07-2008, 13:20
mixedgas

Quote:

Originally Posted by andyf97

I was thinking something like this..

http://www.lasershows.ro/temp/gm20.gif

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
07-07-2008, 13:32
andyf97

Quote:

Originally Posted by mixedgas

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.
07-08-2008, 19:51
Pangolin

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