Re: Auto polarity changer

On Tue, 11 Sep 2007 16:26:48 +0000, D from BC wrote:
On Tue, 11 Sep 2007 06:29:52 GMT, "Bill" <nospam@xxxxxxx> wrote:

I need a circuit to automatically change output from a high to low, every
time I remove power. How about like a 555 chip or some type of flip/flop
that gives you a high output when triggered when you first apply power?
After you shut the system off and turn it back on the output is low. Next
time power off then when back on, the output of the chip is high.
IOW alternate highs & lows each time the system is turn on. I hope my
explanation is OK.

Posted so far I think was:
uC with mem (ex: flash mem)
logic + battery

Here's my short term idea...CMOS logic + Supercap!

I thought we had a new rule here: No "use a PIC" posts without a
full schematic, code, and link to the development system. ;-)

Thanks!
Rich

.

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