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Old 04-13-2008, 05:26 AM #33
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Default Re: Testing DDl's circuit

My power supply consists of 4 AA Energizer Lithium batteries, and I thought that would be enough. When I measure their voltage after hours of non-use, it comes out to about 7 volts; and after an hour of on and off use, trying to test my circuit with the 4 rectifier diodes, it was around 6-6.2 volts.

And yet, instead of getting that range going up to 250mA, I'm only getting up to 190mA. Should I measure the Vout and Vadj pins to ensure that I have 1.25 volts flowing there?


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Old 04-13-2008, 05:40 AM #34
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Default Re: Testing DDl's circuit

Quote:
Originally Posted by Fusion2004
My power supply consists of 4 AA Energizer Lithium batteries, and I thought that would be enough. When I measure their voltage after hours of non-use, it comes out to about 7 volts; and after an hour of on and off use, trying to test my circuit with the 4 rectifier diodes, it was around 6-6.2 volts.

And yet, instead of getting that range going up to 250mA, I'm only getting up to 190mA. Should I measure the Vout and Vadj pins to ensure that I have 1.25 volts flowing there?
If you are using the 2 X 10 ohm resistors, with the 25 ohm pot, then yes, you should be able to turn it up to 250mA's. 4 AA X 1.5 is 6 volts. That is why the LM317 is dropping out. It is not able to maintain exactly 1.25 volts across it's sense resistor. Do you have a way of testing the driver with either 2 X 3.6 volt batteries? Or, add another AA or two into the battery pack. Then I'm sure you will see the range it is supposed to give.
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Old 04-13-2008, 06:04 AM #35
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Default Re: Testing DDl's circuit

Yeah, my voltage between the Vout and Vadj was only around 1.07 volts.
And unfortunately, my battery holder only has 4 battery slots.

I have some 3.6V RCR123As on their way from DX, but my diode is going to arrive long before those batteries do. Meh, I'll run it off of 5-6 AAs then, until my Hong Kong Post package arrives. :P

Thanks for the info, Jay.

And just as a side question, I know the SenKat diodes have an operating current of 130mA, just about how high can I safely push that?

(P.S. Does anyone know where I can find CR123A battery holders?)
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Old 04-13-2008, 06:12 AM #36
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Default Re: Testing DDl's circuit

Quote:
Originally Posted by Fusion2004
Yeah, my voltage between the Vout and Vadj was only around 1.07 volts.
And unfortunately, my battery holder only has 4 battery slots.

I have some 3.6V RCR123As on their way from DX, but my diode is going to arrive long before those batteries do. Meh, I'll run it off of 5-6 AAs then, until my Hong Kong Post package arrives. :P

Thanks for the info, Jay.

And just as a side question, I know the SenKat diodes have an operating current of 130mA, just about how high can I safely push that?

(P.S. Does anyone know where I can find CR123A battery holders?)
Here's a link for the battery holders:
http://www.digikey.com/scripts/DkSea...e=BC2%2F3AE-ND

People are pushing the Sony/Senkat diodes to 250mA's. This will give you around 160mW's to 170mW's with an acrylic lens. I like to push these diodes a little more. I like 294mA's (4.3 ohm resistor, no pot). This will put you around 200mW's with an acrylic lens. At this power, it is best to have a nice heatsink!
Jay

P.S. We have been reading about some new diodes that Stonetek is selling that may be able to be pushed even a little more!
http://www.laserpointerforums.com/fo...num=1206910274
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Old 08-22-2008, 01:34 PM #37
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Default Re: Testing DDl's circuit

Quote:
Originally Posted by chimo
You could also use a 1/4Watt 100 ohm resistor for a BluRay dummy load. It is fairly close to the dynamic resistance of the BluRay when running at around 40-50mA. You can also calculate the current in your head by measuring the voltage and dividing by 100.
That's a good point. Why can't we just use a properly valued resistor as a dummy load for any wavelength LD instead of the series connected diodes and resistor? Wouldn't that be a lot simpler?
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Old 08-23-2008, 05:49 PM #38
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Default Re: Testing DDl's circuit

For the 803t diode what values do you use for the resistors and the pot? need to get about 160mA.......... or higher
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Old 09-10-2008, 09:34 PM #39
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Default Re: Testing DDl's circuit

Quote:
Originally Posted by rog8811
I am about to post a "How To" on testing DDL's circuit before adding the LD, I hope it is all pretty clear and with no errors. Those members who have been there, done that, would you please let me know if you disagree with anything therein.

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*Edit Circuit layout attached to help with circuit testing
thanks dude, I looked everywhere for this layout..
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Old 09-10-2008, 09:37 PM #40
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Default Re: Testing DDl's circuit

My Pleasure
It is nice to see it is still of use to folk....

Regards rog8811
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Old 09-22-2008, 02:45 AM #41
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Default Re: Testing DDl's circuit

is 4 AA batteries bad to power it?
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Old 09-22-2008, 04:40 PM #42
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Default Re: Testing DDl's circuit

Quote:
is 4 AA batteries bad to power it?
If you are building a red 4 AA's will work when batteries are fresh but they will soon sag causing the LM317 to drop out of regulation.....

5 X AA will give 7.5v, much better......

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Old 09-23-2008, 01:31 AM #43
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Default Re: Testing DDl's circuit

crap, i already bought the 4X battery snap
is there anyway to make a 5X battery snap?
and what happens if it drops out of regulation?
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Old 09-23-2008, 04:12 PM #44
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Default Re: Testing DDl's circuit

Go to 3.7v rechargables http://www.dealextreme.com/details.dx/sku.5790

You can either use the 4 pack holder and short out 2 battery positions or get a 2 battery holder.

If the LM317 goes out of regulation at best you will get less output from the LD.
At worst... dunno never tried it

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Old 09-24-2008, 10:47 AM #45
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Default Re: Testing DDl's circuit

woah, it took a while for me to find this and its prety mad!

but, just double checking, instead of 4, i need to use 6 1N4001 for 803T Blu-ray.

thanks.
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Old 09-24-2008, 07:26 PM #46
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Default Re: Testing DDl's circuit

Quote:
but, just double checking, instead of 4, i need to use 6 1N4001 for 803T Blu-ray.
I have not used the LM317 for any of my 803T builds so I am not sure......
I am sure that someone who has done it will let us know soon

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Old 09-25-2008, 06:00 AM #47
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Default Re: Testing DDl's circuit

oh, so this driver is for 650nm :'(. is there a BR build then?
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Old 09-25-2008, 06:07 AM #48
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Default Re: Testing DDl's circuit

I use DDL/LM317 for BR sometimes, just change the resistor value for the current. and for a test load 6 IN4001 diodes instead of 4. and also increased voltage because the BR wants atleast 5v instead of 3v like the reds. even more at higher currents I believe. 9V battery seems to work alright <150ma. That's what I've found, I'm sure others on here have used this setup also. I'm not an electrical whizz though so don't understand what's going on in the circuit, all I know is that the end result works.
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