70C is quite high. So I guess you'd need a fairly good heater. If it were me I'd set up a test with a powerful air heater (hair dryer?) and put a thermal sensor just in front of the heatsink. Then just do a feedback loop to regulate the temperature to 70C. Digital thermometer/thermostats like the DS1621 is perfect for this. The DS1621 is typically used in air conditioning equipment. In thermostat mode it doesn't even need a microcontroller to operate.
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18 years ago