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HELP!! : transistor switching circuit

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desmond

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harlow there, if i have a voltage range from 0.6 volts to 1.4 volts, can i use transistor to switch on a typical LED which has the forward voltage at round 2 volts?

If cannot, how can i do that?

Thanks in advance :wink:

Desmond.
 
the supply i used actually is 5 volt, but due to a circuit there, the output i have is 0.6volt to 1.4volt (the range) ...

then i would like to prove that the voltage there is not 0 so i am thinking to use LED as the indicator.

so do you think 0.6volt (we take the minimum) can switch on a LED by using transistor? maybe bjt or mosfet? or what should i do?

Thanks.

Desmond
 
The problem is that 0.6V is just a little lower than the Vbe for most BJTs. I'll think about it a bit more and get back to you :D.
 
yeah .. i am thinking the same way too :)

i will try it out with LM751 first lar ..

thanks man ~ :wink:
 
The LM331 is a component I have enjoyed lately. Maybe it would be handy for you. It comes in a convenient SOT-5 package.

j.
 
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