The simulator reports 13.5 mA at the LED and 430 ?A at the base for an hFE of 32.
QuoteThe simulator reports 13.5 mA at the LED and 430 ?A at the base for an hFE of 32.No, no. hFE is a characteristic of the transistor, not the overall circuit. You're looking at the current gain of the circuit.A major point of designing a transistor circuit is that you minimize the effects of variations in the characteristics of the transistors, since they can vary quite a bit. So Rbase is chosen to limit the current in the base/emitter circuit, and Rled is chosen to limit the current in the LED through the Collector/Emitter circuit, and everything will work just swell as long as hFE is "much larger" than Ic/Ib
I already did XDThis is from an upstairs window - can't really tell, but the undrifted snow is 20" deep, and the pile from the city plows at the end of the drive is 4 feet and 8-10' wide.