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Old 04-22-2012, 10:38 AM #33
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Default Re: Driver Circuit Thread

Here's an interesting update. I solved the problem with this board, though I did it without actually figuring out what exactly the problem was - or at least what the root of it was.

The problem, somehow, arose from using the 5V regulator for the LED power source. In fact, the actual split rail circuit worked just fine, but when I introduced the regulated 5V into the equation by connecting the LED panel, problems materialize.

What's interesting, is that the LED panel I'm using supposedly has isolated grounds. IE, a GND for the 5V power supply, and a separate GND for the measurement signal.

Well - that can't be true, because it sure didn't like the 5V regulator using a ground different from the split rail's ground.

The solution was simple - to take the 5V regulator and move it to the positive rail side. I'm hoping that having the additional drain on the + side and not the - side won't create any troubles, because it appears to work great now


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Old 05-03-2014, 12:12 PM #34
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Default Re: Driver Circuit Thread

Quote:
Originally Posted by jib77 View Post
Here is an easy dual rail driver based on a LM358N Op-Amp and a NPN/PNP Transistor pair. Useful for things that requires a + and - voltage like OPHIR Thermopile heads.


Sorry for the necropost.

My LPM uses this circuit. I had one made through Oshpark (Laen at the time) years ago.

Back then it was irrelevant, but now I'm wondering what determines max reading range? My setup clips at about 3800 mW (mV) of reading, and I'm trying to figure out whether this circuit is the culprit, or the LED digital display I'm feeding the reading to.

Any thoughts?
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Old 05-03-2014, 12:43 PM #35
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Default Re: Driver Circuit Thread

What voltage are you feeding the circuit with and what voltage does it output to the Ophir? The Ophir needs a couple Volts above the power you want to measure. I drive mine with 10V and it's fine up to 5W (my bottleneck is the ADC).
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405nm: NewWish (29.1mW avg|5mW rtd) | Dilda (81.5mW avg|200mW rtd) | 501B by Blord (633mW pk)
low 445nm: C6 from Survival Lasers (1351mW pk|1289mW avg|1100mW rtd)
high 450nm: NewWish (12.6mW pk|5mW rtd) | Dominator by Blord (3010mW pk|2779mW avg during 5min)
462nm: 501B by Atomic (1507mW avg)
473nm: BWB-10-OEM labby by CNI (10mW rtd)
~462-476nm "Tunablue" by Atomic (1.5W pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (8mW avg)
532nm: NewWish (28.6mW pk|26.8mW avg|10mW rtd) | Dapper (30.3mW pk) | Classic (120.0mW pk|103.1mW avg|100mW rtd) | "The Green Box" by Atomic (176.7mW pk|140.0mW avg)
589nm: Spartan from Dragon Lasers (58.4mW pk|37mW avg|50mW rtd)
632.8nm: HeNe pointer by Atomic (0.68mW rtd)
635nm: NewWish (4.6mW avg|5mW rtd)
638nm: Classic from Lazerer (409.3mW pk|389.4mW avg|415mW rtd)
650nm: NewWish (10.6mW pk|5mW rtd) | Dilda (216.3mW avg|200mW rtd)
685nm: laser-in-a-box by Atomic (30.4mW pk|29.3mW avg) | 501B by Atomic (32.4mW avg)
780nm: module (2.7mW avg|5mW rtd)
808nm: Classic modded from a 532nm (162mW avg)
850nm: module (8.8mW avg|7mW rtd)
980nm: NewWish (81mW pk|5mW rtd) | 2nd line around 490nm

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