Hi, Once again demonstrating my vast quantities of ignorance... I need a diode which completely blocks current in one direction and presents as little resistance in the other direction as possible. I bought a fist full of little glass ones at Radio Shack for 50 cents. On my Ohm meter, they show no conductance in one direction and 1400KOhm the other way. What do I need to get? RS (which is the only resource I have available, I need them like _NOW_) has many different kinds of diodes, ranging up to two dollars per pair. Thanks, Bill Sudbrink