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Questions tagged [not-gate]

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5
votes
2answers
64k views

Making a logic circuit with only NAND GATES?

I am trying to create a logic circuit using only NAND Gates for this expression: (NOT Q AND P) OR R This question has really gotten me stuck! Can somebody please help?
8
votes
3answers
11k views

Using CMOS Schmitt trigger inverters in quartz crystal oscillator circuit

In all sources I've seen about quartz crystal oscillators using CMOS inverters there's a note like this: But why Schmitt inverter is needed? Won't classic 74HC04 work?
2
votes
2answers
496 views

What is the use of transistor in the input side in TTL logic family?

Second transistor will turn ON and OFF if input voltage is directly connected to its base terminal. Then why a coupling transistor is used at the input side of a TTL logic gate?
2
votes
1answer
98 views

An inverter gate reduces the peak-to-peak of the signal!

Using a HCF4049 to invert a signal, I simply fed the input to one of its not-gates and got its output. Here is the result: The highlighted red lines is the output of the not-gate. (Yep! my analogue ...