well, unfortunately I don't really have a schematic. I kinda built it ad hoc, without a circuit design other than what I put together in my head. It uses the standard 555 timer PWM circuit with the exception that one of the capacitors is tied to a double pole, double throw switch. The double pole switch allows me to toggle between different capacitors and at the same time toggle the output of the 555 circuit.
For example: When the switch is in position A, I use a cap appropriate for stir fan control and the other leg is tied to the output of the 555 circuit powers the fan. When the switch is in position B, I use a cap appropriate for heat stick control and the other leg is tied to a SSR controling the 15A 110V line out the back.
I also built my own bridge rectifier powersupply to power everything. Totally not worth it considering you can pick up wallworts pretty easy and for much much cheaper than what it cost me to piece it together.
If you are still interested I can try and put together a schematic of the design.