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Old 05-15-2011, 02:04 PM #289
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Jufran88 View Post
I actually built one of these about 2 months ago, but I failed. I gave up because I am waiting for summer break so I can figure out what went wrong.

I used MarioMaster's and Jib's schematics but the readings seem to fluctuate a lot. It worked for a moment and I went eat dinner came back and it didn't work
Schematic:


Board:
The reason your circuit is not working is that you have made
a one wring connection.
The connection on your Schematic and your Artwork between
pins 6 and 7 should be removed and put between pins 6 and 5...

BTW... the industry standard for PCB layout colors is Blue for
the component side (top) and red for the solder side (bottom)..


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Old 05-15-2011, 04:00 PM #290
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Benm View Post
Since its there anyways, using it as a buffer or extra correction stage would be a good idea. Some people prefer multi-turn pots, others 2 'normal' pots for fine and course adjustment. The latter could easily be realized by adjusting the buffer amps gain slightly.

Also, if you are not using an opamp, dont connect both pins to ground and let the output remain unconnected. You should connect the output to the - input and the + input to ground.

Connecting both to ground results in amplifying offset voltages by infinity, which isnt good since those offsets can vary with temperature, possibly leaving the omamp output flappering between ground and supply voltage randomly.
Quote:
Originally Posted by MarioMaster View Post
Thanks, I will update the schematic when I have some time
I just followed Benm's advice since that op amp isn't used. Maybe I could run 2 different boards one where both in2+ and in2- are grounded and out2 not connected. Or just completely not connect those pins, would that work?

The layer colors were given by eagle, I didn't change them or I don't think you can change them.
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Old 05-15-2011, 05:04 PM #291
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Jufran88 View Post
Actual board:
Quote:
Originally Posted by jib77 View Post
Those are both nice looking boards. If you don't mind me asking, where did either of you have them produced?
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Old 05-15-2011, 05:09 PM #292
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Default Re: DIY Thermal LPM for under $50

Dorkbot PDX, Jib and I use the same website to order our boards. We both have a link in our sig.
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Old 05-16-2011, 05:52 PM #293
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Default Re: DIY Thermal LPM for under $50

Sounds like reversed polarity on the IC. That's close to the only thing you could do that should make the board hot. If so, you'll eventually burn a little hole in the IC, or short your supply. Dbbl check your circuit layout and the positioning of the IC (you know that if you hold the IC with the indention on the left, that pin 1 is the one on the bottom left, pin layout is 1,2,3,4 on the bottom left to right, 5,6,7,8 are on the top right to left? If there is no indention, there will be a dot or dimple over pin 1).

If that is it, your IC is indeed fried. Nothing else should be damaged.

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Old 05-17-2011, 12:52 AM #294
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Default Re: DIY Thermal LPM for under $50

I don't know. I checked multiple times between the board layout, data sheet, schematic and acutal board. I built 2 boards both with new parts over 2 months ago. Same problem.

I'm going to be looking for different parts and I'll be cleaning up the schematic and hopefully that will work better.
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Old 05-17-2011, 01:22 AM #295
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Jufran88 View Post
I don't know. I checked multiple times between the board layout, data sheet, schematic and acutal board. I built 2 boards both with new parts over 2 months ago. Same problem.

I'm going to be looking for different parts and I'll be cleaning up the schematic and hopefully that will work better.
The PCB is an exact copy of the Schematic... but you still have the
same error on both the Schematic and the PCB when you compare it
to jib77 schematic or MM's... (refer to post#289)

The 2nd OpAmp's output is tied to the input...and that OpAmp does
nothing.... (but pump it's output into one of the inputs)
The output should be floating... the +in should be to GND and the -in
should be tied to VCC.

I'll test that tomorrow when I'm in the shop...


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Old 05-17-2011, 01:29 AM #296
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Default Re: DIY Thermal LPM for under $50

Hmm, but if the second op amp (unused) does nothing would it matter if it was floating or tied to the input?

I used benm's advise on the second op amp.

I'll revise the board to set the second op amp floating and the 2nd inputs to ground.
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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
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
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Old 05-17-2011, 01:36 AM #297
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Default Re: DIY Thermal LPM for under $50

Yeah it matters....

If the inputs are floating that can pick up stray AC
like an antenna and amplify that signal and/or start
to oscillate drawing more current.
Since it is on the same die as the other OPAmp it can
induce errors/noise into the OpAmp being used.


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Old 05-17-2011, 02:37 AM #298
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Default Re: DIY Thermal LPM for under $50

I am enlightened.

Thanks for the explanation! I'll update my board soon to correct that error.

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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
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Old 05-17-2011, 05:02 AM #299
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Default Re: DIY Thermal LPM for under $50

Actually, all you need to do to fix this circuit is to ground your IN2+.

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Old 05-17-2011, 05:41 AM #300
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Default Re: DIY Thermal LPM for under $50

Actually, that's how mines was hooked up. The + was grounded and output connected to - on the unused op amp.

I just read through some data sheets of similar LM358s and stated that inputs should be grounded and outputs left open on unused op amps in a dual op amp package. And I also googled "unused op amps" and found a lot opposing that statement.

It's pretty confusing

But since the original design works, I'll stick with it.
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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 05-17-2011, 09:09 AM #301
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Default Re: DIY Thermal LPM for under $50

Someone use resistors, for do the connection, for avoid direct wiring and high loads in case of accidental short circuits ..... i mean, connecting the IN- to OUT through a 1K resistor, and the IN+ to GND through another 1K resistor.
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Old 05-17-2011, 04:10 PM #302
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Default Re: DIY Thermal LPM for under $50

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Originally Posted by Jufran88 View Post
Actually, that's how mines was hooked up. The + was grounded and output connected to - on the unused op amp.

I just read through some data sheets of similar LM358s and stated that inputs should be grounded and outputs left open on unused op amps in a dual op amp package. And I also googled "unused op amps" and found a lot opposing that statement.

It's pretty confusing

But since the original design works, I'll stick with it.
Another option is to just build a two stage amp using both sides. Which is what I do. One side is a course adjust and the other is a lower gain fine adjust. But this leads to a more complicated circuit though.
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Old 05-17-2011, 05:06 PM #303
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Wink Re: DIY Thermal LPM for under $50

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Originally Posted by qumefox View Post
Another option is to just build a two stage amp using both sides. Which is what I do. One side is a course adjust and the other is a lower gain fine adjust. But this leads to a more complicated circuit though.
I do the same, but using 2 separated op-amps (usually 741) ..... this way, i can use offset regulation for trim the "zero" set of the output without have to use "strange" floating voltmeter connections at the GND

Also, you can improve a bit the "noise reduction", placing a resistor in parallel to the 100nF cap at the input, and another 1uF (NON electrolitic) capacitor in parallel on the voltmeter output points.
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Old 05-17-2011, 05:39 PM #304
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Default Re: DIY Thermal LPM for under $50

Hehe. 741's.. Old school. They're kind of a pain for this application because you kind of have to jump through a few hoops to make them run single supply.
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