Hi Byron,
        you have not mentioned how you are getting your 12v and 5v?  I used
inductive switching for the + rails and overwound an extra coil to get my
-ve by stealth :)  In general I have found that inductance is not very
critical (at least when using lm2576's :)

have a look at http://members.xoom.com/andrewmuck/PSU.htm

        cya,    Andrew...

> -----Original Message-----
> From: Byron A Jeff [SMTP:byron@CC.GATECH.EDU]
> Sent: Thursday, 30 December 1999 7:15
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Need another set of eyes for MOSFET capacitive switcher
> design
>
> In the process of building a DC-DC converter for my car MP3 player I've
> come across the need for  -5 and -12 volt power. While I am aware of that
> there are a number of single chip solutions, especially from Maxim, I'm
> attempting to attack a capacitive switcher for reasons of
> understandability
> and parts availablity. In short I have no idea where to get parts for or
> how to wind flyback transformers. Also I wanted to practice/learn some
> discrete design skills.
>
        <snip>