Hi ! On my N-scale layout there's a locomotive repair shop. I'd love to have a blue led blink randomly to simluate arc welding .. but I can't find on the Internet any circuits I could build (must have complete circuit, I can follow a plan but can't understand them). I've seen some for sale but are quite costly ... I've also seen this next one but uses programmable chip, but I'd have to pay to have the chip programmed : http://www.kleefeld.freeserve.co.uk/model/barry/pic01/rc_odds.htm#Weld01 Anybody has a simpler circuit with common components, something a dummy like me could build ? P.S.: I don't need sound. Thanks !