Section 3 Flashcards
(19 cards)
What is a relay
A switch that works via electricity
What can a transistor be used for?
Used like an electronic switch (relay), or amplification
What is a BJT
Bipolar Junction Transistor
Two types:
NPN
PNP
What is an NPN transistor?
Three connections
Base connection on the left
Collector (+) connection top right
Emitter (-) Bottom right
No voltage in base then collector and emitter get no power (so no connection like a switch)
Voltage applied to base then collector is connected to emitter
If small amount of current travels from base to emmiter and 0.6 v to base then we get more current from collector to emitter
Left Emitter(-) Base Collector(+)
What is an oscillating circuit?
Auto switches on and off, like a blinking light
What is a relay oscillator?
It uses a relay to oscillate
Create a relay oscillator
Do this and learn relays better
What are integrated circuits(IC)
Small circuit
DIP - dual inline packaging - good for breadboard
Surface mount packaging - For production
What is the triple 5 (555) timer IC?
8 pins
Pins are numbered from upper left pin counter clockwise.
Upper left will have a circuit by it or indentation at the top.
Looks like this:
1 8
2 7
3 6
4 5
ALL IC’s are different!!! Look at data sheet for this info
1 - ground
2 - trigger
3 - output
4 - reset
5 - control voltage
6 - Threshold
7 - Discharge
8 - Vcc
What does Vcc refer to?
Voltage at the Common Collector
Positive terminal
What are the 3 modes available to a triple 5 timer IC?
Astable mode
output pin will be in constant cycle. Oscilation happens out output
Monostable
trigger will cause output to go on and off for a certain amount of time.
Bistable
Do the 555 timer project
https://www.youtube.com/watch?v=IbGrNgx6-lg&list=PLah6faXAgguOeMUIxS22ZU4w5nDvCl5gs&index=24
What is a NOT digital logic gate?
There are several
NOT GATE - takes one or more inputs and gives you one or more output values.
low(0) = high(1)
high(1) = low(0)
These can be seen on a TRUTH TABLE.
What is an OR digital logic gate?
Two inputs
0 and 0 = 0
0 and 1 = 1
1 and 0 = 1
1 and 1 = 1
What is an AND Gate
Two inputs
0 and 0 = 0
0 and 1 = 0
1 and 0 = 0
1 and 1 = 1
opposite of OR
What is an XOR (exclusive OR)
Two inputs
one or the other but not both
0 and 0 = 0
0 and 1 = 1
1 and 0 = 1
1 and 1 = 0
It’s exclusively for ors, no ands at all.
What is a NAND gate?
Two inputs
0 and 0 = 1
0 and 1 = 1
1 and 0 = 1
1 and 1 = 0
Not AND - it’s an inverse of and
What is a NOR gate?
Two inputs
0 and 0 = 1
0 and 1 = 0
1 and 0 = 0
1 and 1 = 1
