>I used a 555 once in my life, to run a little charge pump to make some
>negative voltage from +12. I ran the output back to the timing cap
>through one resistor, avoiding the usual extra parts in the
>charge/discharge path to get a square wave... something that I thought
>was obvious but not on the datasheet. I still don't see that
>configuration very often.
>
>John
You've seen it many times from me. But it gives 50% ONLY with the CMOS version. ...Jim Thompson