Homebrew PCBs

Yes, i have several meters with thermocouple probes, so that was no problem.
For $50 you can probably get one of the chinese digital controllers on
ebay and a semiconductor relay.
(But then, programming does not cause you as much horrible pain as it
does for me......)

ST

On Fri, Mar 27, 2009 at 2:41 PM, DJ Delorie <dj@...> wrote:
>
> Stefan Trethan <stefan_trethan@...> writes:
>> If you are interested in the more economical version, this is it:
>> <http://s5.tinypic.com/9ghpxj.jpg>
>
> I thought about doing something like that.  The problem was, I needed
> a specific temperature (the film says 240F), and had no way of
> measuring the actual temperature in the laminator.  The advantage of
> using a thermocouple with the MAX chip is that it tells me *actual*
> temperature, in degrees.  No need to calibrate the dial - just turn it
> until the right number shows up, and the chip keeps the laminator at
> *that* temperature.
>
> I had tried just hacking the temp sensor in the laminator by putting
> things between it and the roller to make the rollers run hotter, but I
> had no way of knowing if it was working or not.
>
> Of course, my way cost me about $50 in parts :-P
>