I am reluctant to do full build documentation for this one, as it involves 240vac. However there are many tutorials on YouTube, and if anyone wants a complete write up on my build, I certainly can do one...........
!WARNING! PC POWER SUPPLIES CAN STILL GIVE YOU A NASTY SHOCK, EVEN WHEN TURNED OFF AND DISCONNECTED FROM THE POWER POINT!
This MOD was done completely from parts I found in my shed, so cost = $0.00. The only things I had to buy were the Magnetic Stirring Bars and some Glass Beakers.
1 x old pc power supply with fan - found in shed
1 x old PC fan speed controller - found in shed
1 x miscellaneous LEDs and Resistors - found in shed
1 x piece of perspex - found in shed
Later I added a $6 12V motorcycle hand grip heater from ebay