Dc to dc

[groom1109]

Looking for a circuit__12 vdc to 475 to 500 vdc at about 400 mils, any body have one? To be used for photoflash(cap charging).

[smason]

Re: Dc to dc

If you want to learn how to design it, have a look here:

[redwire]

Re: Dc to dc

That's almost 200W... for charging up the cap.
One possibility is to use a car inverter (12-120VAC, or better 240VAC) for parts or entirely. They'll have a 170VDC (340VDC) bus.
The latest flash circuits use Linear Tech chips like LT3751, some with IGBT flash duration control.
Coilcraft offers HV transformers to go with the chip. Hope this gives you some ideas.

There's a lot of (older) strobe information here: http://donklipstein.com/samflash.html

[mariushm]

Re: Dc to dc

This tutorial is excellent, explains how camera flash circuits work in detail and how you can modify them for other things like powering nixie tubes:

part 1 http://www.youtube.com/watch?v=8YuDlhMMIaw
part 2 http://www.youtube.com/watch?v=4qNt3RlscZg
part 3 http://www.youtube.com/watch?v=RziYdY1ovsM

[ben7]

Re: Dc to dc

400mils? you mean 400mA?

Cameras that I have taken apart have a tiny step up transformer, usually about 1cm x 1cm x 1cm in size