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Author Topic: PNP Transistor not 'shutting off' when increasing voltage.  (Read 595 times)
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dhenry
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« Reply #15 on: October 14, 2012, 05:56:08 pm »
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My initial setup was:
...
What i understood you meant was:

They will never work.
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Inevitableavoidance
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« Reply #16 on: October 14, 2012, 05:57:44 pm »
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Quote from: dhenry on October 14, 2012, 05:56:08 pm
Quote
My initial setup was:
...
What i understood you meant was:

They will never work.


Could you explain what you mean by that..?
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Grumpy_Mike
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« Reply #17 on: October 15, 2012, 03:01:34 am »
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What i understood you meant was:
Yes I thought you were not getting it.
Try the attached diagram.

As for dhenery, sorry about him but he has poped up recently and is giving a lot of bad advice.
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dhenry
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« Reply #18 on: October 15, 2012, 05:58:08 am »
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To switch off a bjt, you have to bring its base to within 0.6v of its emitter. That means your pnp's base has to be least 11.4v or more.
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