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FrozenGate by Avery

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.
 
MarioMaster said:
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.
Click to expand...

True, but with ones that small the voltage is pretty low, the 0.7V TEC's are a nightmare to work with.
 
Zeebit said:
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.
Click to expand...

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.
 
Please HELP!

easylpm.PNG


Lwcn6.jpg


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!
 
You may want to choose a smaller peltier, with those large ones you'll be waiting a few minutes before you get the reading.
 
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.
 
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

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

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

Zeebit said:
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.
Click to expand...
 
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.
 
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:
Hi Boys!

5bXbtR.jpg


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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