Hello All,
There was an excellent article in Nuts & Volts magazine
(July 2004) entitled Microcontrollers are great But Don't
Pass Up Conventional Electronics by Dustin Christopherson
page 64.
The below circuit was featured. I modified the circuit
so that the Flashing LED's can be controlled from a pin of
a 80C51 IC.
I laid out a printed circuit board which is shown at.
http://members.aol.com/cpu8052/7400ffpcbs.gif
Schematic can all be seen at this address.
http://members.aol.com/cpu8052/7400ff.gif
I found the circuit useful for some model railroad work I do on the side.
Regards,
Charles Bannister