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Old 11-05-2013, 02:56 PM #433
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Zeebit View Post
Will this module be okay to use?
Module Thermoelectric Tecnologic Power Generator Tec 6 6mm x 8 3mm Laird Compay | eBay

I can't find the spec sheet for this particular tec module. I found on the manufacturer's website similar sized modules and this should have a Qmax of around 3W.
Can you find the Vmax? That's what really matters. The smaller TEC's usually have a low voltage which is unusable for a LPM sensor.


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Old 11-05-2013, 10:06 PM #434
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Default Re: DIY Thermal LPM for under $50

Honestly it's not a huge deal, most TECs don't require any kind of unreasonable gain from the opamp so noise and such is usually pretty low especially with the capacitance on the input of the amp.
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Old 11-05-2013, 10:35 PM #435
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Default Re: DIY Thermal LPM for under $50

Vmax is 2.7V. So it this usable for an LPM?
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Old 11-05-2013, 11:00 PM #436
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Default Re: DIY Thermal LPM for under $50

Yes it should work
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Old 11-05-2013, 11:46 PM #437
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by MarioMaster View Post
Honestly it's not a huge deal, most TECs don't require any kind of unreasonable gain from the opamp so noise and such is usually pretty low especially with the capacitance on the input of the amp.
True, but with ones that small the voltage is pretty low, the 0.7V TEC's are a nightmare to work with.
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Old 11-07-2013, 04:38 AM #438
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Zeebit View Post
Will this module be okay to use?
Module Thermoelectric Tecnologic Power Generator Tec 6 6mm x 8 3mm Laird Compay | eBay

I can't find the spec sheet for this particular tec module. I found on the manufacturer's website similar sized modules and this should have a Qmax of around 3W.
This TEC should be fine. It has 6x6 junctions as far I can see. I used a TEC with 6x6 junctions for my first DIY LPM and the TEC has a more linear ouptut compared to one with more junctions I used for another LPM.
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Old 11-17-2013, 06:19 PM #439
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Default Re: DIY Thermal LPM for under $50

Please HELP!





Be good a drawing?

________

This circuit are compatible with this voltmeter?
DC 50V 0 49 9V RED LED Digital Volt Voltmeter Panel Meter Power Supply 5V | eBay


please help me choose TEC from ebay:
Thermoelectric Module | eBay

THX boys!
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Old 11-17-2013, 06:22 PM #440
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Default Re: DIY Thermal LPM for under $50

You may want to choose a smaller peltier, with those large ones you'll be waiting a few minutes before you get the reading.
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Old 11-17-2013, 09:54 PM #441
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Default Re: DIY Thermal LPM for under $50

I posted a link to a TEC I found on eBay. It's pretty small. That voltmeter is okay to se but you will need to power it from a separate supply/battery. If you have a multimeter you could use it as well.
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Old 11-17-2013, 10:28 PM #442
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Default Re: DIY Thermal LPM for under $50

This TEC is compatible with this circuit ?

Module Thermoelectric Tecnologic Power Generator Tec 6 6mm x 8 3mm Laird Compay | eBay

I wannt to use voltmeter with power supply (battery) , because i wannt to make box for this LPM.

0-1.999 V DC voltmeter is not good, because if I wannt test 3W laser, he write for me maximum 1.999 v . I think...

because i wannt use this:
DC 5V 0 4 9V RED LED Digital Volt Voltmeter Panel Meter Power Supply 5V | eBay

or this

3˝ DC 0 20V Blue LCD Digital Volt Panel Meter Voltmeter | eBay

but I dont know which is the best for me!?

Quote:
Originally Posted by Zeebit View Post
I posted a link to a TEC I found on eBay. It's pretty small. That voltmeter is okay to se but you will need to power it from a separate supply/battery. If you have a multimeter you could use it as well.
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Old 11-17-2013, 10:38 PM #443
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Default Re: DIY Thermal LPM for under $50

The max power that module can take is around 3w based on the datasheet. Just find a voltmeter that can display at least a 0-5v range.
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Old 11-17-2013, 10:52 PM #444
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Default Re: DIY Thermal LPM for under $50

OK THX!

but this ebay TEC is good ? You use it ? Which pin is positive and negative ?



Module Thermoelectric Tecnologic Power Generator Tec 6 6mm x 8 3mm Laird Compay | eBay

Quote:
Originally Posted by Zeebit View Post
The max power that module can take is around 3w based on the datasheet. Just find a voltmeter that can display at least a 0-5v range.
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Old 11-17-2013, 10:59 PM #445
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Default Re: DIY Thermal LPM for under $50

To test it, attach both leads to a power supply or a battery for a few seconds. One side will get hot and one will get cold. The cold side is where you attach the heatsink.

If you reverse the polarity it will switch the hot and cold sides. You can use it in any polarity

I have not used it yet but I will be when I will be building the LPM. Since you are using it near it's limits, I suggest you look for TECs that can handle more power to ensure accurate readings.

Last edited by Zeebit; 11-17-2013 at 11:03 PM.
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Old 11-18-2013, 08:35 AM #446
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Default Re: DIY Thermal LPM for under $50

This link is not work!please upload this file again!thx!

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http://dl.dropbox.com/u/1181169/easylpm.brd

you can download the board layout file here
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Old 11-18-2013, 12:42 PM #447
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Default Re: DIY Thermal LPM for under $50

Thx bro !

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To test it, attach both leads to a power supply or a battery for a few seconds. One side will get hot and one will ...
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Old 11-19-2013, 02:44 PM #448
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Default Re: DIY Thermal LPM for under $50

Hi Boys!



I dont have 5K resistor, because we in Europe have only 4K7 and 5K6 !
Which would be better to replace the 5K ?
THX!
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