In car power supply

[DRAINVILLE, Michel]

Hi everyone. This is my first post to this list. I'm building a
dynamometer and performance analyser for my car, using a Atmel 8952.
I'm now in the power supply section and faced to the heat dissipation
problem. I'm not using a DC-DC converter because of the price.
I tried to use a 7809 and 7805 together and also a 7805 with a bypass
transistor but both setups generate a lot of heat. (7 to 8 watts).
My circuit draws about 800ma including LCD and backlight.

I was curious to know what do you use to power your EFI management
systems or how you handle heat.

thanks.
Michel Drainville
drainville at paprican.ca

PS: please answer privately because I'm not a member of the list.
    (my project is not related to EFI)