Project Presentation
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- Words: 266
- Pages: 14
12/17/2008
M. Raghib Malik M. Yasir Jamil Khan Munir Shah
B.E Electronics IV
1
12/17/2008
An Introduction to 555 Timer/Oscillator I.C Backbone Of Modern Electronics
2
12/17/2008
“A semiconductor device that controls various modes of on/off states in electrical systems or circuits. The 555 timer is one of the most widely used types of integrated circuits.” First introduced around 1971
3
12/17/2008
Energy storage, Periodic Waveforms, and One of the most useful electronic devices
4
4
12/17/2008
Pendulum Bouncing ball Vibrating string (stringed instrument) Circular motion (wheel) Cantilever beam (tuning fork) 5
5
12/17/2008
Three operating modes 1.
Monostable mode:
The 555 functions as a "one-shot".
Applications include Timers Missing pulse detection Bounce free switches Touch switches Frequency Divider Capacitance Measurement, etc.
6
12/17/2008
2.
Astable Free Running mode:
as an oscillator.
Uses include LED and lamp flashers Pulse generation Logic clocks Tone generation Security alarms, etc.
7
12/17/2008
3.
Bistable mode or Schmitt trigger: Operate as a flip-flop, If the DIS pin is not connected and no capacitor is used. Uses include Bounce free latched switches, etc.
8
12/17/2008
Inside a 555 Timer/Oscillator
9
12/17/2008
Different Packages of 555
10
12/17/2008
40 LED Bicycle Light Our Project
11
12/17/2008
Transistors:
•2N2219A (high speed switches) The 2N2219A and 2N2222A are silicon planar Epitaxial NPN transistors. They are designed for high speed Switching application at collector current up to 500ma
12
12/17/2008
•2N2907A (General Purpose Amplifiers and switches):
The 2N2905A and 2N2907A are silicon planar epitaxial PNP transistors designed for high speed saturated switching and general purpose applications
13
12/17/2008
14
M. Raghib Malik M. Yasir Jamil Khan Munir Shah
B.E Electronics IV
1
12/17/2008
An Introduction to 555 Timer/Oscillator I.C Backbone Of Modern Electronics
2
12/17/2008
“A semiconductor device that controls various modes of on/off states in electrical systems or circuits. The 555 timer is one of the most widely used types of integrated circuits.” First introduced around 1971
3
12/17/2008
Energy storage, Periodic Waveforms, and One of the most useful electronic devices
4
4
12/17/2008
Pendulum Bouncing ball Vibrating string (stringed instrument) Circular motion (wheel) Cantilever beam (tuning fork) 5
5
12/17/2008
Three operating modes 1.
Monostable mode:
The 555 functions as a "one-shot".
Applications include Timers Missing pulse detection Bounce free switches Touch switches Frequency Divider Capacitance Measurement, etc.
6
12/17/2008
2.
Astable Free Running mode:
as an oscillator.
Uses include LED and lamp flashers Pulse generation Logic clocks Tone generation Security alarms, etc.
7
12/17/2008
3.
Bistable mode or Schmitt trigger: Operate as a flip-flop, If the DIS pin is not connected and no capacitor is used. Uses include Bounce free latched switches, etc.
8
12/17/2008
Inside a 555 Timer/Oscillator
9
12/17/2008
Different Packages of 555
10
12/17/2008
40 LED Bicycle Light Our Project
11
12/17/2008
Transistors:
•2N2219A (high speed switches) The 2N2219A and 2N2222A are silicon planar Epitaxial NPN transistors. They are designed for high speed Switching application at collector current up to 500ma
12
12/17/2008
•2N2907A (General Purpose Amplifiers and switches):
The 2N2905A and 2N2907A are silicon planar epitaxial PNP transistors designed for high speed saturated switching and general purpose applications
13
12/17/2008
14
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