XNOR CIRCUIT

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sxy

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Hi
In the file attached why in case of the lower input is high and the higher input is low: we have current in the Base of T4;
so why the led L1 is not glowing from the current of the Emitter of T4?
Thanks
 

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Hi,

Why are the two input transistor bases (T3, T4) connected via the base of T1 resistors (R3, R4)? Must be a lot of maths to ensure the voltages through the sum(s) of the base resistors don't accidentally turn on the wrong BJT. Missing symbol at end of LED is ground, I suppose.

To guess your question, maybe it's to do with summing voltages that depend on the states of T1, T3 + T4.
 

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