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Symbolic representation of ideal devices implementing boolean functions

0 votes
0 answers
34 views

One BJT NOR gate resistor values [duplicate]

What is the purpose of this RD resistor and how do I calculate all the values in this one bjt NOR circuit to have something reliable. And how do I measure fanout of this gate?
wolflu's user avatar
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1 vote
0 answers
181 views

Chaining NAND gates does not work and results in wrong simulation with LTspice

I started building basic logic gates. I wanted to start basic and understandable so I started building some NAND gates just using two transistors. On its own hooked up to a switch and a LED they work …
wolflu's user avatar
  • 33
2 votes
2 answers
328 views

NAND gate with two vs. one BJT transistor(s)

Why is everybody discourage from this paired NAND BJT Transistor "design"? I already saw a few posts where somebody asked something about the paired BJT NAND "design" and the answers only say: don't d …
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  • 33