Circuit diagrams:
http://www.taunus-biker.de/~mdvp/Lambda/Lambda.html
http://www.fabrio.it/puntogt/tecnica/lambda.htm
They are not in English, but supposedly the diagrams should be easily understood.
LM3914's datasheet:
http://cache.national.com/ds/LM/LM3914.pdf
About the LED current, haha, I fried some chips. I like them bright :twisted: Right now I attach a heatsink on it. Hope it helps...