External PSU for EOS

[chouet]

I've just taken delivery of a HQRP adapter for my 40D (from Amazon) - looks ok, but haven't tried it out yet.

[Psychobilly]

The LM317T is more than capable of doing it I use ally or diecast boxes for the heatsink... just remebr the tab on the 317T is connected to the output pin so make sure you use an insulating kit with it... especially if your using soemthing like a phono socket on the same box for connecting the dummy battery...

[yesyes]

Thanks Psychobilly. I did opt for a ready made PSU though. Bit too much of a risk for me. It took me quite a while to convince *her* that I need an EOS. I can't afford to break it now. I was already sweating when testing my EOSbox with the shutter cable and USB. ;-)

Hmmm, LM317 reminds me of last night. I got a massive blister on my finger now. Going from 18V to 5V at 1.5A with only a tiny heat sink doesn't seem to be within specs. The circuit didn't work and I was checking if the LM317 was getting warm... ;-)

(different project though..)

[johninderby]

If you're thinking of building an external battery pack this link may be of interest. Also a timer project.

http://www.tellurian.ca/newastro/eosbatterypg.html

John

[Psychobilly]

My fav chip use quite a few of them so the odd one goes walkies

I use external NiMH packs that give me 8-10 hours continous running ... again we buy them by the thousand and the wllwarts and chargers to recharge them so...

These use a MIC28102BT which is overkill for the Camera supply but needed for what we use them for... the volatge is adjustable using a multi turn preset for a few volts around the nominal voltage set by a couple of fixed resistors...

[chouet]

I've just taken delivery of a HQRP adapter for my 40D (from Amazon) - looks ok, but haven't tried it out yet.

Faulty unit - not well made either. Not recommended.

[Herbig]

Look for a second hand original Canon one on ebay, I picked one up for £9 works a treat.