Homebrew PCBs

sounds gret for the temperature regulation !

For the epoxy wall be aware that you need to be very precise to achieve a proper work of alignment of the rollers.
A CNC would do a better job ...

JP

--- In Homebrew_PCBs@yahoogroups.com, "sailingto" <sailingtoo@...> wrote:
>
> Sorry it took so long to respond to your msg JB, but been pretty busy last couple of days.
> 
> The temperature controller is not published - wasn't sure if anyone had much interest.  It's pretty simple and not sophisticated at all. I have looked at using a PID, but am currently at a simpler approach.  I have the program set to heat on HIGH until 20ºF before setpoint, then the PWM output starts slowing in a steady 255 steps until at setpoint the output is zero.  As the temperature falls 1ºF below setpoint the PWM starts slowly ramping up to keep temp from heating too much.  
> 
> This provides a ±3ºF spread - maybe 4ºF but works pretty good.
> 
> I like the idea of epoxy for the walls - I have a couple of PCBs that are almost 1/4" that would work a treat for that. I could use the old plastic (before melting:) as a pattern, and a scroll saw to cut the pattern.  
> 
> Good luck and having fun!!
> 
> Ken H>
>