High voltage to Logic level shifting

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Mahen K

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will this circuit work? All NPN transistor switching circuits I have seen switch higher voltages from lower voltages (at base). Here, I need to switch 3.3V with 12V. i.e When no voltage at base Vout should be high (3.3V) and when 12V at base Vout should be Low (0V).

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mahenk
 

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That circuit should work fine. Since the normal rule-of-thumb is to use a base current of at least 1/10 of the collector current to saturate the transistor, any base resistor (R75) of 330k or less will work.
 

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