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Old 02-04-2017, 03:05 AM #1
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Default Did I blow my M140 diode?

While do some tests with an M140 I'm configuring for a laser cutter CNC rig, I think I might have fried the diode.

I'm using constant current ttl driver like this one:
http://1.bp.blogspot.com/-1CXU52VYHt...5720011537.png

As I ramp up the signal on the TTL line, I notice the diode becoming brighter, but around 400-500 mA, it goes dim, though it continues to draw current all the way up to the max I have it set at (1.5A).

I'm guessing I accidentally fried the diode with a lose connection, or while connecting the diode to the board, as I hadn't soldered down the lines yet.

I've ordered a new one, but I assume my conclusions are correct?


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Old 02-04-2017, 03:24 AM #2
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Default Re: Did I blow my M140 diode?

Quote:
Originally Posted by MilchstrabeStern View Post
While do some tests with an M140 I'm configuring for a laser cutter CNC rig, I think I might have fried the diode.

I'm using constant current ttl driver like this one:
http://1.bp.blogspot.com/-1CXU52VYHt...5720011537.png

As I ramp up the signal on the TTL line, I notice the diode becoming brighter, but around 400-500 mA, it goes dim, though it continues to draw current all the way up to the max I have it set at (1.5A).

I'm guessing I accidentally fried the diode with a lose connection, or while connecting the diode to the board, as I hadn't soldered down the lines yet.

I've ordered a new one, but I assume my conclusions are correct?
Sounds like a terrible quality driver for starters ... TTL should be either on or off, it shouldn't get brighter as you up the current. Where did you measure current draw?
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Old 02-04-2017, 03:49 AM #3
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Default Re: Did I blow my M140 diode?

To clarify, I wasn't increasing the current on the TTL side. I was changing the PWM signal on the TTL side from 0 to 100%, and measuring the current going through the diode.
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Old 02-04-2017, 01:20 PM #4
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Default Re: Did I blow my M140 diode?

Quote:
Originally Posted by MilchstrabeStern View Post
While do some tests with an M140 I'm configuring for a laser cutter CNC rig, I think I might have fried the diode.

I'm using constant current ttl driver like this one:
http://1.bp.blogspot.com/-1CXU52VYHt...5720011537.png

As I ramp up the signal on the TTL line, I notice the diode becoming brighter, but around 400-500 mA, it goes dim, though it continues to draw current all the way up to the max I have it set at (1.5A).

I'm guessing I accidentally fried the diode with a lose connection, or while connecting the diode to the board, as I hadn't soldered down the lines yet.

I've ordered a new one, but I assume my conclusions are correct?
Yeah... it looks like you LEDed the Laser Diode and you even stated
why it happened. Time to get another one. Been there... Done that.

Jerry
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