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Old 02-02-2014, 11:29 PM #273
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

OK think I found everything from Farnell.
Would this rectifier bridge be ok?
http://si.farnell.com/jsp/search/pro...sp?SKU=1861526

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Old 02-03-2014, 04:01 AM #274
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

I would recommend the GBPC3501 for the diodes. For the shunt, PWR4412-2SDR0100J looks like a
good option.
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Old 02-04-2014, 09:10 AM #275
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

I found following in literature:
Test Load*
A common method to test the driver is to connect a regular silicon rectifier diode to the driver output. Here has to be paid attention to the junction*capacitance*of the diode. Only fast recovery diodes (or similar) have a low parasitic*capacitance*as laser diodes have. To achieve reasonable test results, the parasitic elements of the test diode and the connection must be very similar to a laser*
diode approach. Regular silicon rectifier diodes have a junction*capacitance*of several microfarads and are not a suitable test load! The use of these diodes will yield in incorrect current measurement at the pulse edges!

Can you comment this?
Does bridge rectifiers you suggested have LOW capacitance?

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Old 02-04-2014, 10:02 AM #276
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

This only applies to pulsed laser diodes. CW diodes are usually run at DC.
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Old 02-04-2014, 10:49 AM #277
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Yes my laser diode is CW type but to use it with CNC and regulate power I use PWM power pulse on diode itself.
So my pwm on my diode is 10kHz.
To simulate possible voltage spikes at transition do you think I should think of low capacity rectifier bridge?

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Old 02-04-2014, 07:00 PM #278
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Got my test load. Very nice work. Drivers are great too. Thanks so much.
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Old 02-06-2014, 12:24 PM #279
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Any chance you'll have them in stock by next week?

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Old 02-06-2014, 09:26 PM #280
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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
Yes my laser diode is CW type but to use it with CNC and regulate power I use PWM power pulse on diode itself.
So my pwm on my diode is 10kHz.
To simulate possible voltage spikes at transition do you think I should think of low capacity rectifier bridge?

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The GBPC3501 should work well enough for testing. As long as there are no big overshoots
on the scope at powerup, I think you are going to be fine. The big diodes can take some
abuse, unlike the ones we work with here much of the time. You are going to have a
capacitance on the output of the driver anyway to tame the aforementioned overshoot. Some
final testing should be done once the actual laser diode has been attached anyway.
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Old 02-07-2014, 12:58 AM #281
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Hey Jim I'm expecting to have some in by Monday or Tuesday!
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Old 02-07-2014, 09:23 PM #282
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

That's good to know!

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Old 02-10-2014, 03:09 PM #283
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Looking forward to seeing the test load is available again.
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Old 02-10-2014, 04:22 PM #284
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Mine has been getting it's use lately. Love how easy it is to use. Throw some alligator clips on and boobam. I also made a little rig to select one or two cells so I don't have to break out the power supply every time. Super convenient
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Old 02-10-2014, 10:22 PM #285
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by The Lightning Stalker View Post
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.
Hi, I made dummy load with diode bridge as you suggested. There is no resistor in series with diode, but I have shunt resistor in my 10A current driver.
However dummy load doesn't eat any current... How is this possible?

How do I know that? Heat sink is cool as the summer beer
What's wrong?
Rectifiers are the one you suggested.

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Old 02-10-2014, 11:01 PM #286
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Hey Guys the latest batch just arrived in the mail!! I'll be PMing you guys individually as I only have a limited amount this time. I'll go in order of who PM'd me or posted on here. More will be coming!!
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Old 02-10-2014, 11:11 PM #287
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

They do look like they're connected in series. I only count 11, so it may not quite reach 10.5V @ 11.5A.
It looks like the problem might be reverse voltage (that is assuming red positive and black for negative).
They should be "backwards" with neagative going into + and positive into the - terminals. When all else
fails, double check the continuity of the solder joints and use the multimeter's diode test mode to check all
the diodes.
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Old 03-02-2014, 09:17 PM #288
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

1 left for this batch! 10-12 days for the next batch!
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FS: 3A selectable test loads *IN STOCK* - link

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

My DIY LPM - link
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