Hi, if you look at the datasheet you will see why it doesn't work. Why you would even consider simulating such a circiut is beyond me.
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19 years ago
zener trouble
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19 years ago
Some people just don't bother with the sims, and do just the experiments. ;-)
Move the 10k resistors from the cathodes to the anodes of the zeners.
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19 years ago
And some people just do the math, lay out boards, and go into production.
John
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19 years ago
The circuit will work if you add a resistor from base to emitter of all of the bipolars to allow the zener to reach its test current. usually the test current is 5-10ma. This is also needs consideration when making the divider. LM317 and LM339's are popular because of these drawbacks.
Ray