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 Laser Pointer Forums - Discuss Laser Pointers [Pic Heavy] My DIY LPM by Kalmito

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02-12-2014, 06:10 AM #17
 Class 1 Laser Join Date: Jan 2012 Location: Slovakia Posts: 69 Rep Power: 23
Kalmito
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Re: [Pic Heavy] My DIY LPM by Kalmito

I need to connect 10x10 Ohm SMD resistor to series or Parallel Connection ? How thick is the plate ?

Which the S pin ?

Last edited by Kalmito; 02-12-2014 at 06:33 AM.

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02-12-2014, 07:23 AM #18
 Class 2 Laser Join Date: Jun 2011 Location: Cologne, Germany Posts: 386 Rep Power: 32
honeyx
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Re: [Pic Heavy] My DIY LPM by Kalmito

Quote:
 Originally Posted by Kalmito I need to connect 10x10 Ohm SMD resistor to series or Parallel Connection ? How thick is the plate ? Which the S pin ?
You solder the 10 resistors in series so they look like an "S". There you get an 100Ohm resistor in form of an "S". This one you are going to glue on the aluminum plate. The plate should be about 1-2mm thick.

So 100Ohm*0,050A= 5V and 5V*0,050A=0,250W or 250mW.

at 100mA you get this:

100Ohm*0,100A=10V and 10V*0,100A=1W.

You can of course use an constant voltage source for this too but a constant current source is better and more accurate.

02-12-2014, 02:22 PM #19
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honeyx
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Re: [Pic Heavy] My DIY LPM by Kalmito

This is about what I mean. But rather than glueing the resistors directly on the TEC like a ring in form of an "U" I did it on a aluminum plate in form of a "S".

Last edited by honeyx; 02-12-2014 at 02:22 PM.

02-12-2014, 02:42 PM #20
 Class 1 Laser Join Date: Jan 2012 Location: Slovakia Posts: 69 Rep Power: 23
Kalmito
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Re: [Pic Heavy] My DIY LPM by Kalmito

Quote:
 This is about what I mean. But rather than glueing the resistors directly on the TEC like a ring in form of an "U" I did it on a aluminum plate in form of a "S".

Yes Yes! I understand!
Thanks Brother!Its very good!
I need to buy DC PowerSupply to set the voltage and milliamps.

02-15-2014, 07:55 PM #21
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i73770k
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Re: [Pic Heavy] My DIY LPM by Kalmito

What is the max power this LPM will read?
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02-15-2014, 11:09 PM #22
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Kalmito
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Re: [Pic Heavy] My DIY LPM by Kalmito

Quote:
 Originally Posted by i73770k What is the max power this LPM will read?
3W, maximum 4W, but for the TEC is not good!

07-12-2014, 11:41 AM #23
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hamzajaved780
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Re: [Pic Heavy] My DIY LPM by Kalmito

Cannot see pictures on your first post

Can you post the circuit that you etched on copper board???

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