Thermocouple Applications to generate current to run a very small led ?

  • #1
Can I use a thermocouple which has a temperature difference of 1 degree to generate current to run a very small led.
 

Answers and Replies

  • #2
35,259
11,510
If you find some way to have a huge heat flow and if you can increase the voltage by orders of magnitude: maybe. In practice, probably not. LEDs need a minimal voltage (depending on the color, but at least ~2V) to work.
 
  • #3
dlgoff
Science Advisor
Gold Member
3,912
1,863
Here's a graph showing the Millivolts produced at various temperatures for several common Thermocouple types. Not much change in voltage per ºC change in temperature.

480px-Intermediate_temperature_thermocouples_reference_functions.svg.png
 
  • #4
702
34
When I was a kid, there was a project in an encyclopedia that used a series of thermocouples to power a small radio. By
wiring thermocouples in series, you get what's termed a thermopile.
The design I read about used a lamp socket and candle along with a bunch of thermocouples.
Later I learned that Russians often used a similar arrangement to power radios.
 
  • Like
Likes Averagesupernova and dlgoff
  • #6
702
34
Yes, LOL, you'll need a zillion thermocouples to make it from 1 degree C or F.
Piltier devices (used for 12 volt coolers) offer a simple means of getting voltage from a temperature difference.
I've applied 12 volts to one, allowed it to settle, and then used it to power a small 6v bulb for a short time. Fun!
 

Related Threads on Thermocouple Applications to generate current to run a very small led ?

Replies
16
Views
1K
  • Last Post
Replies
12
Views
10K
  • Last Post
Replies
4
Views
2K
Replies
4
Views
1K
Replies
15
Views
16K
  • Last Post
Replies
2
Views
2K
Replies
2
Views
2K
Replies
19
Views
20K
Replies
29
Views
1K
Replies
16
Views
1K
Top