Homebrew PCBs

Chuck,

I modified a cheap ($30) laminator I bought at Wal-Mart, by letting a
process controller like this one control the temperature:

http://www.omega.com/ppt/pptsc.asp?ref=CN132&Nav=temp03

I have seen similar "autotune" ones on ebay for less than $50. 

Originally, the laminator had two things in series with the heating
element: a fixed-temperature thermostat for regulating the
temperature, and an over-temp breaker for protection, which tripped at
a much higher temperature.

I ripped out all that wiring and let the process controller's relay 
control power to the heating element. I used a piece of thermocouple
cable as the temperature sensor, by twisting together the wires at one
end and clamping this end to the heated frame.

I'm fairly certain the GBC unit is similarly wired; you should open it
up and take a peek.

Marshall

--- In Homebrew_PCBs@yahoogroups.com, "Chuck Kelsey" <wb2edv@...> wrote:
>
> OK, new question related to the problem I believe I was having.
> 
> Who has modified their laminator to either produce a higher heat or
longer 
> (slower) processing time? Could you share the info?