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2 Transistors as inverted switches

tocalili

Nov 14, 2011
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Nov 14, 2011
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I have a problem, I have 2 led scales, the 1st should be on when a singal (Vin) is between 0 and 5 Volts, the other should be on when Vin is between 5 and 10 V. I thought about making it with BJTs but I don't know how to do it, can someone show me a circuit?
 

Harald Kapp

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Nov 17, 2011
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Hi,
see the attachment. R1 and R2 are stand-ins for your 2 circuits. Also you'd have to do the dimensioning of the components yourself to get the desired threshold and the power requirements right.
It's probably a good idea to insert another diode into the emitter connection of Q2 to compensate for the voltage drop across D2.


Regards,

Harald
 

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