ON 20091001@3:13:29 PM at page: On a web page you were interested in at: http://www.piclist.com/techref/power/dctodc.htm#40087.6343634259 James Newton[JMN-EFP-786] archive reference /techref/postbot.asp?by=time&id=piclist/2003/05/02/035317a List post "[EE]: How to build a cheap charge pump" Boost Switcher runs from PIC PWM output. Zenar regulation could be replaced with PIC A2D to vary PWM. ON 20091001@3:16:41 PM at page: On a web page you were interested in at: http://www.piclist.com/techref/power/dctodc.htm#40087.6365740741 James Newton[JMN-EFP-786] archive reference /techref/postbot.asp?by=time&id=piclist/2003/05/02/042058a List post "[EE]: How to build a cheap charge pump" 2 stage capacitor pump run from PIC PWM pin. See picture.