Another peltier project

Discussion in 'The Projects Forum' started by trent, Jan 11, 2008.

  1. trent

    Thread Starter New Member

    Jan 11, 2008
    1
    0
    I am also starting to create a circuit using the exact peltiers. We are trying to develop a way for people to commuicate with heat. I also have very limited electronics but I do have the peltiers in my hand and I am eager to get them working. I thought it was as simple as hooking up a battery but I read in this post about PWM circuit using a 555 timer and a power MOSFET and I am a little hesitant to just hook them up now. Any information for a beginner would be appreciated. I will continue to look back at this post and share any good info I find...trent
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Tacking your post onto an existing one is hijacking, a practice we discourage. Please always start a new post, even is the topic is the same as one under discussion.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    A Peltier device would not be a good choice for communications. They are relatively slow to respond to changes in voltage levels, and require a relatively large amount of current when compared to an ordinary incandescent bulb.

    Peltier devices are best used for heating/cooling; keeping temperatures constant. Never quickly reverse the flow of current through a Peltier device, as the stress will soon destroy it.

    Subjecting just about anything to rapid thermal cycles will cause failure due to metal fatigue, much like bending the tab on a soda can back and fourth too many times. The metal crystallizes, becomes weak, and separates.

    You might investigate methods of exposing/covering a source of heat, such as a dimly lit lamp by using a translucent LCD panel or the like.

    Infrared (IR) LED's fall into the heat spectrum; they have the advantages of being inexpensive, reliable, and readily available from many suppliers. However, it seems that you intend on using actual radiant heat.
     
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