Friends,
I am in need for a heat source for my PCB which is enclosed in a metal case. The heat source needs to be controlled using an ON-OFF control using a MOSFET. I was looking at adding a large power resistor, then it stuck me that I could use a filament bulb as well. The objective is to heat the air inside the enclosure, in order to maintain a constant temperature which is higher than the ambient.
Does anyone has experience using a filament bulb for this purpose? Any drawbacks using this idea?
I plan to use a 12V bulb powered by a 5V source, so that the bulbs life time is extended.
thanks