Hi Olin,

In your schematic what does Q3 do? Since it is pnp transistor and
The base is connected to positive voltage (it is off all the time) I do
not see how is it turning On? 
The schematic looks interesting. You built boost converter and thru p0
(PWM) Pin you are controlling q2 transistor to stabilize the output.

 Thanks

Andre 



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Olin Lathrop
Sent: Friday, September 19, 2008 10:52 AM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] 10F gadgets suggestions

Marcel Duchamp wrote:
> Olins switcher could be an entertaining project for students advanced
> enough to want more advancement.

I don't know what you mean by my switcher.  I have used 10Fs quite a few
times to control switching power supplies, sometimes several on the same
PC
board.

My KnurdLight example PIC project (http://www.embedinc.com/pic/knli)
uses a
10F204 to directly control the switching element of a power supply that
drives a string of LEDs.


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