http://www.sunrise-ev.com/projects.htm#tree This is a gift I've given in years past. It's a simple kit to solder up, and it's a satisfying result. Unlike other "blinky LED" products, this is one you could have built in 1975; so it's vintage. It operates CMOS logic inverters as capacitor/resistor monostables (timers). And, the earliest versions I have from Lee Hart are on PC boards he made in his basement, by *drawing* the circuits with a resist pen. My card dates from 1987, it was his Christmas card for that year. Wow, 32 years ago! and we still fight! That's friendship. ;) Regards and good holidays, Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net preserve, recover, restore 1970's computing email: hjohnson AT retrotechnology DOT com or try later herbjohnson AT retrotechnology DOT info