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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
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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