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FrozenGate by Avery

Feb. 10, 2008 PHAZORS!!!

alright guys I've done some research on the other threads and found out that these Phasor diodes can be driven at 350mA with a duty cycle of under 1 min. If this is correct I wouldn't mind ordering one. Can someone please acknowledge that I didn't get this wrong?

Also, I see a lot of numbers on mW and mA but absolutely nothing on voltage. Am I missing something here? What voltage should these diodes run at?

Thanks once again everyone.

Cheers,

Brian.
 





cyclonite said:
alright guys I've done some research on the other threads and found out that these Phasor diodes can be driven at 350mA with a duty cycle of under 1 min. If this is correct I wouldn't mind ordering one. Can someone please acknowledge that I didn't get this wrong?

Also, I see a lot of numbers on mW and mA but absolutely nothing on voltage. Am I missing something here? What voltage should these diodes run at?

Thanks once again everyone.

Cheers,

Brian.
Click to expand...


thats the magic of the LM317T, it will do the voltage for you, as long as your input is 3v more than the needed output.

the run time depends on the heatsinking. jayrob is selling some cool custom machined heatinks right now...

regards,

amk
 
cyclonite said:
alright guys I've done some research on the other threads and found out that these Phasor diodes can be driven at 350mA with a duty cycle of under 1 min. If this is correct I wouldn't mind ordering one. Can someone please acknowledge that I didn't get this wrong?

Also, I see a lot of numbers on mW and mA but absolutely nothing on voltage. Am I missing something here? What voltage should these diodes run at?

Thanks once again everyone.

Cheers,

Brian.
Click to expand...

We seldom think in terms of voltage when using a current regulator. There is no point in it unless you are testing two unknown diodes to try to find out which one will deliver more. For example I wanted to find out if there was a difference in voltage between the open cans that I harvested from an 18X 112D and a 20X 115D burner. The voltages were exactly the same running them with 350ma's so I concluded the diodes were the same.

Based on Daedal's graph and experiments so far, I still believe these could be run safely with ~420ma's. There will be further testing done to confirm this.
 
thanks amk and Gazoo,

Ok cool. Now my question would be, how should I tune to voltage pot on the PSU then? Do I just keep increasing it as I increase the mA?

Thanks.
 
cyclonite said:
thanks amk and Gazoo,

Ok cool. Now my question would be, how should I tune to voltage pot on the PSU then? Do I just keep increasing it as I increase the mA?

Thanks.
Click to expand...

Yes. And make sure you measure the current between the power supply and the driver as it is much safer, the current will be exactly the same as is going to the diode. Or you could solder a 1 ohm resistor is series with the diode and measure the voltage across the resistor, which will also give you the current. I prefer the 1 ohm resistor method as it is much more convenient, but I do recommend a 1 watt resistor.
 
One more note... I'm in talks with Laser-wave to offer us some excellent TTL-capable 100mW red labby's (like the one above) for about $35 or so :P

If you're in... PM me, please don't fill this thread with discussions on this, unless it is to link to another thread ;)

--DDL
 
Gazoo,

Thanks so much. But still, do we have a rough idea of the voltage that will be going into the Phasor diodes now? I don't need exact but if someone tells me say between 2.5 and 3.5 volts then at least I can always check to make sure I'm 'within range' as that gives me a level of comfort.

Thanks.

Cheers.
 
hey Gazoo / amk:

For the Phasor diode setup using DDL's PSU with 3.33ohm resistor in place, what input voltage to the PSU could I use? Can I use 12v (4 x CR123A lithiums)?

Thanks.
 
i tyhink 12volt is overkill because the regulator will only disipate that energy if i wanted to use 4 i would have two of them in parrelel to give twice the capacity at 7.2 volts. afterall longer runtime is more usefull than a hot lm317.
 
cyclonite said:
For the Phasor diode setup using DDL's PSU with 3.33ohm resistor in place, what input voltage to the PSU could I use? Can I use 12v (4 x CR123A lithiums)?

Thanks.
Click to expand...

One configuration that we know will work good, is to use the MXDL host that DDL originally showed in his 'DIY Laser Torch' thread:
http://www.laserpointerforums.com/forums/YaBB.pl?num=1186966870
Using that MXDL host, the best batteries to use, are the RCR123 3.6 volt rechargeable X 2 - with a DDL driver (use only one resistor at the LM317 - 3 ohm = 420mA's, 3.3 ohm = around 380mA's)

If you use this set up, I would of course, recommend using one of these heasinks as well!
http://www.laserpointerforums.com/forums/YaBB.pl?num=1202452073/0
Jay
 
running at 420mA and using a heatsink from a dx70 how long do you reckon the duty cycle will be and the lifetime of the diode overall. is the output significantly greater than 3.3ohm (380 ish mA). sorry for all the questions.
 
polop said:
running at 420mA and using a heatsink from a dx70 how long do you reckon the duty cycle will be and the lifetime of the diode overall. is the output significantly greater than 3.3ohm (380 ish mA). sorry for all the questions.
Click to expand...

A good guess would be about 20mW difference between 380mA's and 420mA's. But, these estimates that I am giving, are from using an open can diode. I have not gotten my hands on one of these Phazor diodes yet! I have two on order though. We hope that the Phazor diodes will be similar to the open can diodes. I think that I would use a 3.3 ohm resistor to start...
Jay
 
12v is fine, but your gonna get a HOT lm317T. the circuit only needs 6v. but to be safe, 2 RCR123's (3.6v) will be 7.2v, which is good for the driver.

you can also do 3 CR123's (3v) for 9v in, that works too.

regards,

amk

remember, always have 3v more input than the required output. the phazor needs around 3v, so remember to input at least 6v
 
Daedal,
How close are we to completing this GB? Any feelings on when you'll be able to ship them to us?

thanks
 
cyclonite said:
Gazoo,

Thanks so much. But still, do we have a rough idea of the voltage that will be going into the Phasor diodes now? I don't need exact but if someone tells me say between 2.5 and 3.5 volts then at least I can always check to make sure I'm 'within range' as that gives me a level of comfort.

Thanks.

Cheers.
Click to expand...

That would be ~2.4 to 3 Volts...

--DDL
 
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