I have used this as a gate drive supply for IGBT's the +/- are pretty much
symmetrical and have their own bypass caps as part of the max. I uses 10uf
tants in addition to the 100n specified just hold a bit of energy.

Steve

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
wzab
Sent: 11 October 2009 14:29
To: piclist@mit.edu
Subject: [EE] Use of MAX232 as power supply for operational amplifier in
5Vpowered system?

Hi,

I need to add simple amplifier to my digital system which is powered 
from a single 5V battery.
To achieve proper operation of the operational amplifier I need at least
+8V and -8V voltages.
I can build a simple voltage multiplier and inverter like shown here:
http://upload.wikimedia.org/wikipedia/en/thumb/b/ba/Stacked_Villard_cascade.
svg/400px-Stacked_Villard_cascade.svg.png
using the 6-CMOS inverter chip as an oscillator and a source of alternating
voltage.

However antoher idea is to use something cheap and standard like MAX232.
Has anybody tried to use this chip just as a voltage converter?
Unfortunately I can't find the output characteristics for V+ and V- pins.
Maybe I'll need also additional voltage regulator to improve the quality of
this power supply voltage (or maybe simple RC filter will be sufficient...).

Has anybody tried to do it?
-- 
TIA & Regards,
WZab

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