This is kind of a dumb question, but I'm not sure how to phrase it better.
:-(  I've built up a little circuit, using stripboard, which has quite a few
point-to-point wires soldered on it.  There is a 9-volt power input, which
goes to a 7805 which has a .3 uf capacitor from input to ground and a .1 uf
capacitor from output to ground, as recommended by the spec sheet.  I wired
in an 18-pin socket, checked Vdd and Vss with a multimeter, and it has about
5.12 volts.  There is a single LED on the board, with a 1K resistor from one
of the output pins to the LED (and then to ground).

I wrote a little "blink an LED" program and programmed the 16F628 with the
Wisp628.  So far, so good.  It runs, and the LED blinks like a champ.
Except . . . every now and then, the light of the LED will just begin to
quiver, rather than blinking on and off, as if someone mashed down the
accelerator hard!  When that happens, the PIC gets very hot.

I've checked the wiring carefully, and don't see anything wrong.  Don't see
any solder problems.  When it runs, it runs fine, until it goes into
overdrive.  Could this be the PIC going into oscillation?  I don't really
know what that term means when applied to a PIC, but cannot figure out what
else could be causing this.

Thanks for any advice.

Bill
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