# Using a MOSFET with Peltier **URL:** \ **Category:** General Electronics\ **Created:** [September 21, 2013, 1:38am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443 "2013-09-21T01:38:33Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![jgporteous](https://avatars.discourse-cdn.com/v4/letter/j/ecae2f/32.png) [@jgporteous](https://forum.arduino.cc/u/jgporteous)\ **Post date:** [September 21, 2013, 1:38am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443/1 "2013-09-21T01:38:33Z")
Hi everyone, I'd like some feedback on the attached design. The purpose is to power a peltier chip, via the n-Channel MOSFET, but I want to make sure I don't mess up the wiring and damage my Arduino board. Am I missing any components, maybe a diode between the + and - on the peltier chip incase it generates a current while the system is off? Here are a few points: - I have a 14.8V input - IC2 is a 6V regulator, which powers the Arduino board - The peltier chip must receive 14.8 V @ 2A - 7A (or there about) Thanks, Justin ![Peltier Sketch_schem.png](https://europe1.discourse-cdn.com/arduino/original/4X/7/3/6/7367c41f7841fd431010c05c15f47c50fbf2bf16.png) ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [September 21, 2013, 1:45am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443/2 "2013-09-21T01:45:46Z")
There's no resistor to the gate of the fet or pull down. I'm more experienced with bjt, but current flowing out of the peltier should be blocked by thr fet? ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [September 21, 2013, 3:40am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443/3 "2013-09-21T03:40:41Z")
How often are you turning on and off the Peltier device? The Peltier device will not produce enough voltage to do any harm the the MOSFET. If your only turning the device on an off once in a while (to maintain a temperature) your diagram looks fine. Just make sure the Peltier device is thermally connected properly. They can not withstand high internal temperatures. ---
**Author:** ![LarryD](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/larryd/32/215550_2.png) [@LarryD](https://forum.arduino.cc/u/LarryD)\ **Post date:** [September 21, 2013, 5:27am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443/4 "2013-09-21T05:27:02Z")
> •IC2 is a 6V regulator Add a 100nF input capacitor to the regulator. I would use a lm317 adjustable regulator set for 9Volts. > **[Department of Electrical Engineering](https://engineering.buffalo.edu/ee.html)** > > At UB EE, students have the boundless opportunities of a research university, with the advantages of a small school. Our graduates develop innovative new solutions for improving human health, health care, safety, and quality of life for people across... ---
**Author:** ![jgporteous](https://avatars.discourse-cdn.com/v4/letter/j/ecae2f/32.png) [@jgporteous](https://forum.arduino.cc/u/jgporteous)\ **Post date:** [September 21, 2013, 11:55am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443/5 "2013-09-21T11:55:15Z")
> LarryD: > > > •IC2 is a 6V regulator > > Add a 100nF input capacitor to the regulator. > > I would use a lm317 adjustable regulator set for 9Volts. > [Department of Electrical Engineering - University at Buffalo](http://www.ee.buffalo.edu/courses/elab/LM117.pdf) Thank you for everyone for your replies, I'm making a camping fridge and have a heat sink on it. The software will turn it on and off based on the temperature - so not often (or in short time). I forgot about the resistor _blush_. I already have a regulator for the arduino board that works @ 6v. Will try replace my relay with the mosfet and let you know the out come. Hope you can see the pics, here they are [https://www.facebook.com/JGPorteous/media\_set?set=a.10151595122916625.1073741827.587021624&type=3](https://www.facebook.com/JGPorteous/media_set?set=a.10151595122916625.1073741827.587021624&type=3) thanks again, Justin ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 6, 2021, 1:25am UTC](https://forum.arduino.cc/t/using-a-mosfet-with-peltier/184443/6 "2021-05-06T01:25:20Z")
Closed on May 6, 2021, 1:25am UTC