Linear slew rate limiter

[tsmith35]

I got a nice little hot air board heater (Tenma 21-10135) to preheat the bottom of my small circuit boards. It does a nice job, but it heats up very fast. Rather than do a manual ramp by turning the knob, waiting, turning again, waiting and so on, I did some searching and came up with a circuit from edaboard that should provide a nice, linear ramp rate. I know the min and max temps that the temperature control knob will allow, but I'd like to set the ramp up to about 2°C/sec.

The only problem is, I'm green when it comes to designing circuits. The poster provided an image of the planned circuit, but I don't know which parts to use or how to calculate the resistor and cap values to provide what I need. Can anyone help, or just point me in the right direction? Thanks.

[Chrisalat]

What about using LTsice to simulate it?
http://www.linear.com/designtools/software/

[tsmith35]

What about using LTsice to simulate it?
http://www.linear.com/designtools/software/

Thanks! I kept hoping I'd learn a bit about op-amps and circuit design, but maybe I can hack together some workable values with LTspice.