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Old 11-19-2013, 02:52 PM #449
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Default Re: DIY Thermal LPM for under $50

4.7k will work as a replacement for the 5k resistor. You may want to get a multi-turn pot for that 10k pot.


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Old 11-19-2013, 04:00 PM #450
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Default Re: DIY Thermal LPM for under $50

THX!

I have LM358N
I have to connect 6 and 7 pins in GND or not, because here is
not connected:



And here is connected:





Quote:
Originally Posted by ARG View Post
4.7k will work as a replacement for the 5k resistor. You may want to get a multi-turn pot for that 10k pot.
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Old 11-19-2013, 10:34 PM #451
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Default Re: DIY Thermal LPM for under $50

You could leave it unconnected. Pins 5 and 6 are the inputs of the second opamp. You could also ground them to ensure nothing comes out the other end.
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Old 11-19-2013, 10:51 PM #452
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Default Re: DIY Thermal LPM for under $50

Please someone check!
Its right connection ?

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Old 11-19-2013, 11:06 PM #453
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Default Re: DIY Thermal LPM for under $50

but I dont need second opamp , right !?


Quote:
Originally Posted by Zeebit View Post
You could leave it unconnected. Pins 5 and 6 are the inputs of the second opamp. You could also ground them to ensure nothing comes out the other end.
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Old 11-20-2013, 02:24 AM #454
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Default Re: DIY Thermal LPM for under $50

Tie the inverting to the negative supply, and the non inverting to the positive to supply to reduce noise, or tie non-inverting to common an tie inverting to the output.

Last edited by ARG; 02-02-2014 at 04:59 PM. Reason: corrected
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Old 11-20-2013, 11:35 AM #455
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Zeebit View Post
You could leave it unconnected. Pins 5 and 6 are the inputs of the second opamp. You could also ground them to ensure nothing comes out the other end.
Leaving the secound opAmp unconnected or grounding it will cause noise under both circumstates. There is a proper way to terminate unused OpAmps.


Last edited by honeyx; 11-20-2013 at 11:37 AM.
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Old 11-20-2013, 11:51 AM #456
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Default Re: DIY Thermal LPM for under $50

I dont understand this....

this will be good ? :




Quote:
Originally Posted by honeyx View Post
Leaving the secound opAmp unconnected or grounding it will cause noise under both circumstates. There is a proper way to terminate unused OpAmps.

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Old 11-20-2013, 01:28 PM #457
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Default Re: DIY Thermal LPM for under $50

Where is the problem? The first OpAmp should be conneced like in the pic you quoted but the secound terminated like on the pic I attached.
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Old 11-20-2013, 01:59 PM #458
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Default Re: DIY Thermal LPM for under $50

In this picture please write me OpAmp (ic2 lm358)
Used pins... because here is dont writed :




Quote:
Originally Posted by honeyx View Post
Where is the problem? The first OpAmp should be conneced like in the pic you quoted but the secound terminated like on the pic I attached.

Last edited by Kalmito; 11-20-2013 at 02:09 PM.
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Old 11-20-2013, 02:57 PM #459
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by honeyx View Post
Leaving the secound opAmp unconnected or grounding it will cause noise under both circumstates. There is a proper way to terminate unused OpAmps.

That is the best option, but it's not entirely necessary for this.
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Old 11-20-2013, 03:04 PM #460
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Default Re: DIY Thermal LPM for under $50

Everyone else says, now what I do? Please have someone draw a shematik that is functional... I'm clueless...

Last edited by Kalmito; 11-20-2013 at 03:06 PM.
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Old 11-20-2013, 03:21 PM #461
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Default Re: DIY Thermal LPM for under $50

Just wire it as a buffer and connect it to the output.
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Old 11-20-2013, 03:56 PM #462
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Kalmito View Post
Everyone else says, now what I do? Please have someone draw a shematik that is functional... I'm clueless...
Connect the unused OPAmp like honeyx says, only a couple extra resistors.
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Old 11-20-2013, 07:32 PM #463
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Default Re: DIY Thermal LPM for under $50



5,6 pins connected to GND witk 1K ,1K resistor... ( green ) , 7pin not used!
Will be good ?
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Old 11-20-2013, 08:52 PM #464
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Default Re: DIY Thermal LPM for under $50





this is not better ?
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