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#10
August 3rd 05, 03:22 PM
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RST Engineering wrote:
wrote in message ups.com... Trouble was, the thing was oscillating when at mid brightness positions. Too much capacitance on the output. A known problem with emitter followers. Horsefeathers. Emitter followers have less than unity voltage gain and are stable as rocks. And how does a resistive LED load become capacitive? Difficult to imagine. True for a real emitter follower, however if you have an N-stage darlington with N=3, it can oscillate. This was the subject of an IEEE Transactions article in the early 80's and a source of great embarrassment for an engineer I worked with that didn't read the article until after putting the design in production. snip -- Jim Pennino Remove .spam.sux to reply. 
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