> -----Original Message-----
> From: David Harris [SMTP:dpharris@TELUS.NET]
> Sent: Monday, May 05, 2003 12:15 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]:[EE]: How to build a cheap charge pump
>
> Hi-
> Yes, you need to avoid turning both on at once -- a resistor/capacitor
> circuit to delay the turn-on, with a diode across teh resitor to let it
> turn off quck might do the trick.  If you are bulding a H-bridge, or
> half of one, there are lots of resources on the web.
> David
>
If the transistors are wired as emitter followers there is no need for this,
the transistors will not switch on together.

+ve
-----------+-----
           |b
      __b|/    NPN
     |   |\v e
PIC  |     |_____To charge pump
_____|     |
     |___|v/ e
        b|\    PNP
           |c
-----------+-----
0v


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