« previous next »
Pages: [1]   Go Down

Author Topic: Glow-in-the-dark pot?  (Read 1620 times)

0 Members and 1 Guest are viewing this topic.

Online calzapTopic starter

  • Frequent Contributor
  • **
  • Posts: 493
  • Country: us
Glow-in-the-dark pot?
« on: May 12, 2013, 02:27:30 pm »
So, I'm looking for a 3-5 W, 15 K pot, and stumble across a listing on Amazon for a 500 W, 2.2 K wire-wound pot.  URL = http://www.amazon.com/Amico-Resistance-Electrical-Wirewound-Potentiometer/dp/B0087YJ3IQ.  I think it has to be as big as a toaster. Nope, 4.3 cm diameter, 4 cm height, and 1/2 the height is shaft.  If my calculations are correct, the "can" has a surface area of 56 sq cm, so that's 9 watts per sq cm.  Should get a little hot in most environments.  Maybe the spec is off by a couple of decimal places?

Mike in California
Logged
 

Offline Dave

  • Super Contributor
  • ***
  • Posts: 1355
  • Country: si
  • I like to measure things.
Re: Glow-in-the-dark pot?
« Reply #1 on: May 12, 2013, 02:45:50 pm »
I found this.

3W at 55°C, zero at 100°C  :)
The person that wrote that Amazon ad obviously screwed up.
Logged
<fellbuendel> it's arduino, you're not supposed to know anything about what you're doing
<fellbuendel> if you knew, you wouldn't be using it
 

Offline c4757p

  • Super Contributor
  • ***
  • Posts: 7799
  • Country: us
  • adieu
Re: Glow-in-the-dark pot?
« Reply #2 on: May 12, 2013, 02:52:04 pm »
Yep. And 500W into 2k2 is 1kV! Even at 10% of the range you'd need 330V. You will know when you're looking at a pot that can stand off 1kV...
Logged
No longer active here - try the IRC channel if you just can't be without me :)
 

Offline KD0CAC John

  • Frequent Contributor
  • **
  • Posts: 710
  • Country: us
Re: Glow-in-the-dark pot?
« Reply #3 on: May 12, 2013, 03:06:12 pm »
I thought I remembered glowing in the dark after pot .
Oh sorry , wrong prospective :)
Logged
 
Pages: [1]   Go Up
« previous next »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 


EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee