last updated: 15/01/19
Song of this chapter: Darren Korb > Transistor: Original Soundtrack of the game
Electricity’s one-way street
Symbol of a diode, a light emitting diode (LED) and a Zener diode (Z-diode):
In the last decades electronics moved dramatically from analogue to digital. Two elementary digital circuits are the
AND gate. We will use the positive logic, so the two digital states
false will be represented with
+5 V or
+3.3 V) and
0 V) (we will use the Arduino notation) Two inputs of the gate gives 2² = 4 possibilities or cases (3 inputs would give 2³ = 8 cases).
OR is only
false if none of the conditions are fulfilled. If I drink water
OR lemonade I won't be thirsty any more. It's not an exclusive OR because I can also drink both drinks, even mixed :).
AND is only
true if both conditions are fulfilled. If I have money
AND my girlfriend has time we will go to the cinema.
ORgate and an
ANDgate. The output will be visualized with a light emitting diode. Build the first circuit and document all 4 states by drawing the 4 circuits with their corresponding potentials an currents. Explain how the circuit is working.