ELECTRONICS Digital Processes Flashcards
Draw a NPN transistor
Collector
Base
Emitter (arrow here)
What is a transistor?
An electronic switch
At what voltage value is the transistor switch on?
0.7v
GO AND LOOK AT CIRCUIT SHEETS
NOOOOOOOOW
What does a not gate look like?
Triangle
What is a NOT gates process?
Opposite of input eg input 1 output 0. NOT the same as input
What does an AND gate look like and what is its process?
A D, both inputs must be 1. 1 AND 1
What does the OR gate look like and what is its process?
Space ship, if either has an input of 1. Either OR
What is a truth table used for?
To show all possibilities
How is a 1 input produced and how is a 0 input produced?
1:high voltage, 0: low voltage.
What produces clock pulses?
Digital systems
How are clock pulses counted?
By a counting circuit
Give an example of a device containing a clock circuit
Calculators
What type of number is priced by a counter circuit?
A decimal display
What can be done to out puts of counter circuits?
Made into a decimal display
What are clock pulses?
Pulses of voltage that occur regularly.
How can the rate of the pulse be changed?
Changing the capita de of the capacitor or resistance of a resistor.
Give an example where a clock pulse generator could be used
Trafficmlights
The values of the ______ and the ______ control the frequency of the clock pulse circuit.
The values of the CAPACITOR and the RESISTOR control the frequency of the clock pulse circuit.
What is a counter circuit?
A circuit that can count the electrical pulses given by a clock pulse generator.
How can the output of a counter (binary) be changed to a decimal number?
Using a binary to decimal circut
What is an oscillator?
A machine that produces clock pulses by charging and recharging a capacitor.
