1. Bob Pease used an LM334 current source to servo the current from a PNP transistor through an LED diode. The LM334 will draw current into its V+ pin until the voltage on the R pin reaches 0.068 V.

I want to drive power led from a Li-ion cell. I have a few specific requirements. One is that the driver must tolerate a second current source feeding the led, and only supply current when the other ...

The present reference is a special application of current source IC Type LM334. It has a tiny temperature coefficient and draws only a minute current: at room temperature, only 10 µA, which increases ...