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I'm using a GM20 (Actually a GM20 Clone from OSLS) as a safety shutter. My question is how hot do these normally run under continuos operation? I'm driving it at 12 VDC and it only seems to be drawing .75A but after about 10 minutes the GM20 case gets up to about 150°F.
Is this normal?
Try 5 volts - I believe that's what a lot of folks here are using.
You might need to use a transistor driver circuit, but it will work, and should run cooler.
Thanks Stuka,
Sorry I should have said this earlier. I started at 5VDC with a driver but the shaft only rotated about 2 degrees I thought I might have a problem with my circuit but confirmed the same with my bench supply.
I found the following http://www.onestoplasershop.com/info.htm on OSLS's website which said it required 12-18 VDC. That did give the rotation I expected but it runs hot.
http://www.villageoak.com/images/6-1...24-47%20AM.png
Drive it with a pull in current and then relax to a holding current. Once pulled in it will stay with much less energy.
Steve
Steve. Get off the freakin computer and rest!
I have a few hours today and will go back to the 5V driver.
Many thanks.
Jim
This should be able to drive a GM20 nicely.... http://www.allelectronics.com/mas_assets/spec/L298N.pdf
http://www.allelectronics.com/index....hip+&x=14&y=13
Just remember its input requires active pulldown using a resistor or a TTL buffer or inverter, as another PL member found out, and other then that it works great, ie you leave the input floating and it triggers.Quote:
Originally Posted by 300EVIL
I'm the one who helped the other guy use it.
Steve