803T at 147/111 ma => mw

[mauswiesel]

Hello all  
With 2 different powermeters at faculty ($$$), we obtain these result , for a PHR 803T from psxboy , using a mc33269 (ddl style driver), 11 ohm (111 ma) and 8.3 ohm (147/150 ma) resistor and DX acrylic cut lens, no focalisation:

147 ma  =>>  105-110 mw
111 ma  =>>  60-65 mw

Im very far from the 140 mw obtained by other member at 150 ma, but i think its good result (2 different lab powermeter)
MonK's graph and 811 :       /YaBB.pl?num=1211171817/0     (same value at 110 ma, a little higher at 150 ma))

 

[rkcstr]

I had mine set to ~125mA and it puts out about 110mW, measured with a Coherent thermopile head and Knimrod's power meter amp circuit.

IgorT measured a good many of these diodes and found there was quite a bit of variability, which I personally saw in the PS3 diodes as well. So, it's not surprise that there are some that don't do quite as well in addition to those that do VERY well.

 

[daguin]

Hello all
With 2 different powermeters at faculty ($$$), we obtain these result , for a PHR 803T from psxboy , using a mc33269 (ddl style driver), 11 ohm (111 ma) and 8.3 ohm (147/150 ma) resistor and DX acrylic cut lens, no focalisation:
147 ma =>> 105-110 mw
111 ma =>> 60-65 mw
Im very far from the 140 mw obtained by other member at 150 ma, but i think its good result (2 different lab powermeter)
MonK's graph and 811 : /YaBB.pl?num=1211171817/0 (same value at 110 ma, a little higher at 150 ma))

What is the voltage you are feeding them? We have discovered that at the higher input/outputs these diodes draw more voltage, The diode may be in need of up to 6V (after feeding the driver). When I made the "matched set" lasers, using two 10440's with a Rkcstr driver, gave me lower outputs. I had to feed them from three 10440's. You can read a bit about it here.

http://www.laserpointerforums.com/forums/YaBB.pl?num=1215317897

Kick your voltage up to at least 9V (3 @ 10440's give just over 11V)

Peace,
dave

 

[mauswiesel]

Right ! i measure mA through a 1ohm resistor with multimeter when laser is on, so the value of mA for the given resistor is ok, but right, when voltage is close to 7v, the current drop to 130 ma instead of 150 with a 8.3ohm resistor (rkcstr google datasheet    spreadsheets.google.com/pub?key=pW49OuYfRMm4-k6TaQk0BZw  ),        during this test im using 2*cr123 rechargeable battery, voltage is 8.03 volt .My led is weaker than the result of IgorT, but i will compare with 2 other 803T ordered.

@109mA  @125mA (unless mentioned otherwise)
- 71mW - 123mW (at 179mA first test module) - 130mW (at 191mA - now dead after being left
- 90mW
- 79mW
- 94mW - 160mW (at 169mA)
- 95mW - 178mW (at 178mA  fourth test module) now 171mW (at 169mA - this diode is the real freak!)
- 86mW - 103mW
- 89mW - 104mW
- 87mW - 100mW
- 85mW - 111mW (at 128mA)
- 93mW - 113mW (later misteriously changing into 105mW - i
- 86mW - 100mW
- 77mW - 95mW (second test module - will be set to a high current, and left on)
- 82mW
- 71mW - (third test module, not testing yet)
- 90mW - 104mW
- 88mW - 104mW
- 98mW - 120mW (later 130-136mW at 143mA, but now 146-149mW at 172mA,  Died at 187mA)
- 92mW - 107mW
- 89mW - 104mW
- 83mW
- 85mW - 101mW
- 87mW - 107mW (another surprising result.. maybe the 109mA measurement was somewhere inside the "knee")

 

[rkcstr]

What is the voltage you are feeding them? We have discovered that at the higher input/outputs these diodes draw more voltage, The diode may be in need of up to 6V (after feeding the driver). When I made the "matched set" lasers, using two 10440's with a Rkcstr driver, gave me lower outputs. I had to feed them from three 10440's. You can read a bit about it here.


http://www.laserpointerforums.com/forums/YaBB.pl?num=1215317897

Kick your voltage up to at least 9V (3 @ 10440's give just over 11V)

Peace,
dave

Hmm, didn't know the 803T diodes drew that much voltage! So, depending on the operating voltage of the diode, add 2.25V to that voltage to get the minimum working input voltage before the output current starts to drop.

I've been powering mine using a 9VDC wall adapter, so that's probably why I haven't even noticed this before, but was planning to use 2x CR123A batteries in the future, but looks like those plans may have to change. Good to know.

 

[daguin]

Hmm, didn't know the 803T diodes drew that much voltage! So, depending on the operating voltage of the diode, add 2.25V to that voltage to get the minimum working input voltage before the output current starts to drop.
I've been powering mine using a 9VDC wall adapter, so that's probably why I haven't even noticed this before, but was planning to use 2x CR123A batteries in the future, but looks like those plans may have to change. Good to know.

7.4V seems to be fine for less than 100-110mW output levels, but over that, the driver drops out of regulation pretty fast. At the outputs I drive them at (above 140mW), they won't give full output with only two 3.7V batteries. even when fully charged (with your driver). It looks like "pen" type lasers will required a boost driver to attain higher output levels.

Peace,
dave

 

[Hemlock_Mike]

Diodes Don't draw voltage. They draw current relative to the applied junction voltage.

Mike

 

[daguin]

Diodes Don't draw voltage. They draw current relative to the applied junction voltage.

Mike

Correct. Sloppy verbiage.

Peace,
dave

 

[Hemlock_Mike]

It confuses the noob's who won't learn Ohm's law.

Mike

 

[daguin]

It confuses the noob's who won't learn Ohm's law.

Mike

See! That's what you get when you let a speech teacher talk about electronicaly kinds of stuffs

Peace,
dave