Old 07-07-2012, 09:29 PM #1
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Default Is there a way to check for polarity protection on modules?

On MANY occasions I have inserted the battery the wrong way. (standard red & green modules) Nothing happens. Flip it around and it goes on. No Problem. I assumed they all pretty much did this.
In the last two days I have destroyed three modules. ( 2 green, 1 red) putting them in new hosts. EVERYTHING CHECKS OUT PERFECTLY. All connections, nothing touching where it shouldn't.
Really not that complicated.
However it is highly possible I started off with batteries inserted the wrong way. It is my own fault I just didn't give it much though because I thought it didn't matter. If wrong I would flip it.
Now when hooked in reverse nothing happens, when correct the board gets REAL HOT REAL FAST.
Of course in the future I will be VERY careful but is there a way to check to see if the board has protection?
This is the only thing I can think of that may have happened.


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Old 07-08-2012, 12:34 PM #2
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Default Re: Is there a way to check for polarity protection on modules?

Some drivers do have reverse polarity protection but
a lot of the cheaper Lasers don't.

If not sure contact the seller for orientation...


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Old 07-08-2012, 06:53 PM #3
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Default Re: Is there a way to check for polarity protection on modules?

You can use a standard lm317 driver but with a very small filter cap and set to a low current (30mA perhaps?) and connect it to the main driver in reverse. If current flows when you apply power, it probably isn't protected.

Attempt at your own risk
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Old 07-09-2012, 12:00 AM #4
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Default Re: Is there a way to check for polarity protection on modules?

Was hoping for something "visual" or a simple continuity test (which doesn't seem to work).
Example, some green modules have a full size resistor, some don't. Don't know why.
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