Amplifier LM311P Use Problem

Coeylin

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Joined
Mar 20, 2021
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Location
Hongkong, China
Hi, folks
For this little project, I'm using a LM311P. It is has a collector/emitter output. Because my circuit didn't function the way it should, I started debugging.
With the collector unconnected the emitter (pin 1) still sinks (11 mA) and sources (20 mA) current, when applying a square wave input. I measured mean dc amperage to either rail, so the max is higher. I cannot explain this behavior.
Doing the current measurement on the collector (pin 7) with an unconnected emitter I get 14 mA when sinking, and none when sourcing. But not following the input signal.

Is there anyone have suggestions what could cause this? Thanks a lot! :)
 

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