→A little on how it works
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Each input is configured to detect a voltage over approx. 2 volts. When this voltage is reached, a logic HIGH is presented to the corresponding gate input. The output will react to what is present at the inputs, and the result, depending on the gate chip used, is buffered by the emitter follower, and used to drive the LED and output jack.
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▲|+ Truth tables for the different logic gates that can be used in this circuit
!colspan="3" align=center|4001!!colspan="3" align=center|4011, 4093!!colspan="3" align=center|4071!!colspan="3" align=center|4081!!colspan="3" align=center|4030, 4070
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