piclist 1998\11\09\105941a >
Thread: Write voltage and MAX232
www.piclist.com/techref/power.htm?key=voltage
picon face BY : Peter L. Peres email (remove spam text)



On Mon, 9 Nov 1998, Paul B. Webster VK2BZC wrote:

>   You seem to be under a misapprehension.  The MAX232 doesn't *have* a
> +12V rail.  It contains a voltage doubler and a voltage inverter; it
> doubles 5V to 10V, then converts +10V to -10V.

That is true, HOWEVER it has got square wave on some of the external pump
caps, and nowhere does it say, that you are not to connect another small
cap to it, and 2 shottky diodes or a 4066 in active rectifier disguise to
boost another ~5V externally. This needs to be elaborated but it will
work.  The question is, why are you trying to do such impossible things
when a 3:1 ferrite transformer driven by the open drain PIC pin can do all
you want and more ? Ok, you can use a VFET to boost the power, but it may
not be necessary.

Peter

<Pine.LNX.3.95.981109090630.318E-100000@plp4.plp.home.org>

In reply to: <36466383.1DEA@midcoast.com.au>
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