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Old 11-24-2013, 10:31 PM #257
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Electrical tape works, but it will unwrap itself after a while. Heat shrink is better, but the trick is to
remember to put it on before soldering and to keep it far enough away from the soldering area.

The first time I used it I forgot to put it on before soldering, so I had to desolder what I just soldered,
sleeve it on, and then resolder. Then the heat from soldering caused it to shrink around the wire in the
wrong place so I had to cut a fresh piece and start all over again.

It is also possible to use the wrong size heat shrink. Too small and it won't fit over what you just
soldered. Too large and it doesn't make a tight seal when it shrinks.


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Old 11-24-2013, 11:46 PM #258
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

yea Lazeerer told me a few days to do it so I tried that tape and I also covered the whole contact board with hot glue so the driver wouldn't touch the contact board and possibly touch in the wrong area.

I got two of them working. still working on the 3rd one and the 4th one I broke with a drill bit lol Noob mistake!

Quote:
Originally Posted by The Lightning Stalker View Post
Electrical tape works, but it will unwrap itself after a while. Heat shrink is better, but the trick is to
remember to put it on before soldering and to keep it far enough away from the soldering area.

The first time I used it I forgot to put it on before soldering, so I had to desolder what I just soldered,
sleeve it on, and then resolder. Then the heat from soldering caused it to shrink around the wire in the
wrong place so I had to cut a fresh piece and start all over again.

It is also possible to use the wrong size heat shrink. Too small and it won't fit over what you just
soldered. Too large and it doesn't make a tight seal when it shrinks.
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Old 12-30-2013, 11:51 PM #259
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Is there a guide which explains how many diodes to use in series depending on which Ld's we are trying to set the current for? That would make things simple and well explained for some people including me. Thanks.
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Old 12-30-2013, 11:53 PM #260
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Or perhaps a link to the relevant page as i didn't find it yet. Thanks, trying to understand how to setup my driver here before i blow my $100 diode setup b4 New years.
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Old 12-31-2013, 12:04 AM #261
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Each diode has a voltage drop of about 1.2V. the first diode is always in the circuit. so for each jumper location, multiply by 1.2 for the total voltage the load will drop across the driver. so you need to know the voltage drop across the laser diode you intend to use. you can find that in the data sheet. so for example a PL450B (a data sheet I happened to have open) says the operating voltage is between 5.8 and 7V. so I would set the load on 5 to give me 5 * 1.2 = 6V of drop. then you connect your meter across the test pins and 1mV=1mA... so if you want to set 300mA on the driver, you set your meter on VDC and set 300mV. The load simulates the voltage drop across the laser diode you want to use so you can adjust the current of the driver without having the actual LD connected there-by reducing risk of LD damage.

Get it?

Make sure to have your driver on a heat sink depending on whether it can run at full current without being sunk. you can sometimes get by without it being on a heat sink but the risks are all yours.
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532nm: 100mw SH032 DX module pointer (120mw)
150mw tri Lights Lab (260mw)
600mw Wicked Lasers Spyder III Krypton first gen

473nm 50mw Ultra Lasers Labby (over spec 160mw)
488nm 80mw Multi-line AL60X Argon
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Wannaburn Super-small SS (1430mw)
2.9W RDTech 9mm SH032

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200mw Lazerer OSRAM single mode 450nm

405nm: 100mw WL E3 (85mw)
500mw 405nm O-like lab
500mw 405nm Jayrob SS (560mw)

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Old 12-31-2013, 12:41 AM #262
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

@izzzzzz6: Here's a link how to use the test load. You'll have to know the voltage drop of the LD your using which can be found easily by searching the forums. The page in the link will help determine how many diodes to use depending on the current you want. Please also account for voltage drop of the resistor (V=IR). Also the voltage drop of each diode is 0.7V - 0.9V.

https://sites.google.com/site/thejuf...cs/usetestload
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Old 12-31-2013, 12:52 AM #263
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by Jufran88 View Post
Also the voltage drop of each diode is 0.7V - 0.9V.

https://sites.google.com/site/thejuf...cs/usetestload
Good to know. I thought the voltage drop was 1.2V. well, i had the right idea... lol
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650nm: 5mw pointer (early)
250mw O-like OL-CR-250 (170mw)

635nm: 500mw pointer rhd build 18650 SH-032 (650mw)
500mw O-like lab

532nm: 100mw SH032 DX module pointer (120mw)
150mw tri Lights Lab (260mw)
600mw Wicked Lasers Spyder III Krypton first gen

473nm 50mw Ultra Lasers Labby (over spec 160mw)
488nm 80mw Multi-line AL60X Argon
445nm: 1.3W Flaminpyro SS (1350mw) 1.4W
Wannaburn Super-small SS (1430mw)
2.9W RDTech 9mm SH032

450nm: 150mw OSRAM single mode 450nm lab
200mw Lazerer OSRAM single mode 450nm

405nm: 100mw WL E3 (85mw)
500mw 405nm O-like lab
500mw 405nm Jayrob SS (560mw)

3x Shinp 650/532nm/445nm 250+100+300mw Light show (modified to include the 445)

numbers in () are average run for 1 min IR filtered

Last edited by plexus; 12-31-2013 at 12:56 AM.
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Old 01-30-2014, 06:47 PM #264
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Do you have any of these for sale atm?

Thanks
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Old 02-02-2014, 04:09 PM #265
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

I need to test 10.5V operating 11.5A laser diode.
Would it be OK just to mount heatsing with thermal paste on this dummy load?

Can you make resistor and diodes suitable to handle 11.5A and allow load selecting to 10.5V?
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Old 02-02-2014, 06:14 PM #266
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by zhivko View Post
I need to test 10.5V operating 11.5A laser diode.
Would it be OK just to mount heatsing with thermal paste on this dummy load?

Can you make resistor and diodes suitable to handle 11.5A and allow load selecting to 10.5V?
There has been quite a bit of discussion on this subject already which you would have found
had you used the search bar at the bottom of the page.

Testing a High-Output Driver PCB

Cheap 35A Bridge Rectifiers
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Old 02-02-2014, 06:33 PM #267
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

The question was for the creator of this nice dummy load, is it possible to adapt it so it could test higher currents like 11.5A and 10.5 Volts.

For "800 Volt 35 Amp MB35 Bridge Rectifier Diode" - should I connect resistor in series with it to mimic laser diode operation? If yes - what reistance and what wattage?

I atached pdf for laser diode in attachment - check electrical characteristics...
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File Type: pdf 915nm 50W K915FG3RN-50.00W.pdf (213.6 KB, 221 views)

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Old 02-02-2014, 08:40 PM #268
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Oh wow, 11.5A is a little too much for the diodes and resistor on the test load even with heat sinking. Sorry, but there isn't a way to test your laser diode on my test load.

That's a pretty beefy laser diode, what's your application for it?
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445nm 1566 mA A140 SIPIK HK21 (G2 Drive) - link
473nm B&W Tek BWB-10-OEM - 10mW
532nm SKY Lasers DPL - 200mW
638nm 1071 mA GUIDESMAN (AMC7135) - link
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Old 02-02-2014, 08:43 PM #269
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by Jufran88 View Post
Oh wow, 11.5A is a little too much for the diodes and resistor on the test load even with heat sinking. Sorry, but there isn't a way to test your laser diode on my test load.

That's a pretty beefy laser diode, what's your application for it?
Wanna cut some materials with it...
Can you please suggest parts so I can build my own dummy load?
resistor value, wattage of trasistor, and the quantity and part number of diodes and their current rates? They should be in series right?

Last edited by zhivko; 02-02-2014 at 08:44 PM.
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Old 02-02-2014, 09:45 PM #270
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

PM sent.
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405nm 455 mA BDR-S06J GUIDESMAN (G2 Drive) - link
445nm 1500 mA A140 SOLARFORCE L2 GUNMETAL (FLEXDRIVE V5) - link
445nm 1566 mA A140 SIPIK HK21 (G2 Drive) - link
473nm B&W Tek BWB-10-OEM - 10mW
532nm SKY Lasers DPL - 200mW
638nm 1071 mA GUIDESMAN (AMC7135) - link
638nm 1053 mA SS 26650 (AMC7135) - link

LED Maglite 3D DD SST-90 5700K w/ Aspheric lens - link
LED Maglite 3D XM-L U2 bin - link
LED Maglite 2D Triple XM-L U2-1C bin - link

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Old 02-02-2014, 10:33 PM #271
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Don' t use a resistor. Use instead a current sense shunt. BR5FB10L0 is a good part number for your
application. At 11.5A, your meter will read 115mV. It is rated 5W, so you will be able to safely
measure current up to about 22.5A continuous using that. Intermittently even more

Use the diode bridge rectifiers in my previous post. There is a even schematic posted if you follow that
first link. Get 12 of them just in case they are a little on the low side. The last one can either be
connected in the center as in the 3V example, or the same as the rest. You will know when the current
level starts getting close to your 11.5A target. Just measure the voltage drop across the diodes to get it
as close as you can.
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Old 02-02-2014, 10:56 PM #272
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Thank you very much. I am not from USA. It would be great if you can give me equivalent part number from Farnell.
I tried also to find shunt with no success...

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