Hello all,

I am very new to electronics and need to build a simple 12V dc
circuit, which will keep a heater mat at a fixed temperature... ie
switch it on and off depending on tempterature. I guess I need a
device that measures the temperature and opens a switch when that
temperature is reached. Is there an electronic device that will do
that?

Thanks
Alex

"confused2" <aesbrown@hotmail.com> wrote in message
news:1188330307.901264.195410@w3g2000hsg.googlegroups.com...
> Hello all,
>
> I am very new to electronics and need to build a simple 12V dc
> circuit, which will keep a heater mat at a fixed temperature... ie
> switch it on and off depending on tempterature. I guess I need a
> device that measures the temperature and opens a switch when that
> temperature is reached. Is there an electronic device that will do
> that?
>
> Thanks
> Alex
>

The simplest way may be to get a heating pad and use its electronics to
control your mat. As long as the heating pad uses a simple on/off series
switch to control the temperature then it should work.

Bob

On Tue, 28 Aug 2007 12:45:07 -0700, confused2 <aesbrown@hotmail.com>
wrote:

>Hello all,
>
>I am very new to electronics and need to build a simple 12V dc
>circuit, which will keep a heater mat at a fixed temperature... ie
>switch it on and off depending on tempterature. I guess I need a
>device that measures the temperature and opens a switch when that
>temperature is reached. Is there an electronic device that will do
>that?
>
>Thanks
>Alex

http://www.gibsonteched.com/ck112.html

On Aug 29, 2:45 am, confused2 <aesbr...@hotmail.com> wrote:
> Hello all,
>
> I am very new to electronics and need to build a simple 12V dc
> circuit, which will keep a heater mat at a fixed temperature... ie
> switch it on and off depending on tempterature. I guess I need a
> device that measures the temperature and opens a switch when that
> temperature is reached. Is there an electronic device that will do
> that?
>
> Thanks
> Alex

Hello Alex
I am Phuong
I can answer your question with my idea:
If you need a device that measures the temp and opens a switch when
that
temperature is reached.I think the simple you should use the
microcontroller with AD converter as AVR,PIC or 8051 +AD0804.It so
easy to programming that you need.If you interested in this ,pls
email for me : phuongphamcteck@gmail.com

"confused2" <aesbrown@hotmail.com> wrote in message
news:1188330307.901264.195410@w3g2000hsg.googlegroups.com...
> Hello all,
>
> I am very new to electronics and need to build a simple 12V dc
> circuit, which will keep a heater mat at a fixed temperature... ie
> switch it on and off depending on tempterature. I guess I need a
> device that measures the temperature and opens a switch when that
> temperature is reached. Is there an electronic device that will do
> that?
>
> Thanks
> Alex
>

I have friend who makes a temperature-regulated silicone heater mat. It
used a simple IC and a power MOSFET. It was the LM56 low power thermostat.
You can contact him at http://www.patcoinc.com.

A good primer on temp control is:
http://www.wici.com/technical_info/arti ... prmch1.htm

Also National's Temperature Sensor Handbook (which describes the LM56):
http://www.national.com/appinfo/tempsen ... temphb.pdf

Some other sensors are LM34, LM75, LM86 and LM134, or you can look at some
chips from Maxim:
http://www.maxim-ic.com/products/sensor ... itches.cfm

Paul