daguin
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There has been a bit of speculation about the "efficiency" difference between the diodes from the different models of projector
e.g. http://laserpointerforums.com/f65/amazing-m-140-445nm-diode-69195.html
Well there is a good reason for this.
The (older?) A-series used a different diode than the M series and the H series. We will need to find a recently manufactured A-series to see if they have switched to the newer diode or not
I recently bought an H-series for my home projector use.
The projector arrived with some physical damage.
I made a deal with the seller for the broken one and bought a second
That allowed me to have diodes from both the H-series and the A-series on hand.
DTR provided me with a M-series diode
Please forgive my horrendous macro-photography skills
My lack of photography skills is legendary
On the can side, there is no difference in the diodes.
The cans are all plain and devoid of markings
The differences begin to show on the back of the can
***************************A-series********************************M-series******************************H-series***********
The M and H series diodes have a "spot/circle" above the square code
The info inside the square code is different as well, but that may also cover batch, date, etc.
The difference is OBVIOUS once we get inside
Yes My macro sucks.
However, you can make out the difference AND I have provided a hand drawing of what you are looking at
A-series
M and H series
Here's what you are looking for
The A-series diodes have three contacts spread evenly across the die from both posts
The M and H series diodes have four contacts. The contacts on one side are spaced with three at the top of the die and one at the bottom of the die from one post.
The four contacts, from the other post, are evenly spaced
It looks like I'll be dumping the few A-series diodes I have left
Peace,
dave
e.g. http://laserpointerforums.com/f65/amazing-m-140-445nm-diode-69195.html
Well there is a good reason for this.
The (older?) A-series used a different diode than the M series and the H series. We will need to find a recently manufactured A-series to see if they have switched to the newer diode or not
I recently bought an H-series for my home projector use.
The projector arrived with some physical damage.
I made a deal with the seller for the broken one and bought a second
That allowed me to have diodes from both the H-series and the A-series on hand.
DTR provided me with a M-series diode
Please forgive my horrendous macro-photography skills
My lack of photography skills is legendary
On the can side, there is no difference in the diodes.
The cans are all plain and devoid of markings
The differences begin to show on the back of the can
***************************A-series********************************M-series******************************H-series***********
The M and H series diodes have a "spot/circle" above the square code
The info inside the square code is different as well, but that may also cover batch, date, etc.
The difference is OBVIOUS once we get inside
Yes My macro sucks.
However, you can make out the difference AND I have provided a hand drawing of what you are looking at
A-series
M and H series
Here's what you are looking for
The A-series diodes have three contacts spread evenly across the die from both posts
The M and H series diodes have four contacts. The contacts on one side are spaced with three at the top of the die and one at the bottom of the die from one post.
The four contacts, from the other post, are evenly spaced
It looks like I'll be dumping the few A-series diodes I have left
Peace,
dave
