Timers

Question 1

Timer 555

Answer 1

An integrated circuit used in a variety of timer, pulse generation and oscillator applications
Uses both analogue and digital

Question 2

555 Structure

Answer 2

Comparator is a opamp that is optimised for outputing a HIGH or LOW signal depending on whether the + input is higher or lower than the - input
A flip flop is a circuit that has two stable states and can be used to store state information

Question 3

Flip Flops

Answer 3

Have two stable states
Can state state information
Can be built with 2 NOR gates or 2 NAND gates

Question 4

Monostable

Answer 4

An external trigger causes the timer to output a single pulse of adjustable duration. Automatically turns off.

Question 5

Astable

Answer 5

Continually switches between high and low without intervention from user

Question 6

Bistable

Answer 6

Two inputs for on and off

Question 7

PWM

Answer 7

Encode a message into a pulsing signal. Main use is to allow the control of the power supplied to electrical devices.