555 Timer
The 555 monolithic timing circuit is a highly stable device, that can act either as a time delay generator (Monostable/one-shot), a Pulse-Width-Modulator (PWM), a RC Oscillator, or a Voltage
Controlled Oscillator (VCO).
In the time delay mode of operation, the time is precisely controlled by one external resistor and one external capacitor.
For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one external capacitor.
The circuit may be triggered and reset on falling waveforms (trigger, Reset), and the output can source or sink up to 200mA.
APPLICATIONS
Precision Timing
Pulse Generation
Sequential Timing
Time delay Generation
Pulse Width Modulation
FEATURES
Turn-off time less than 2ms
Max. operating frequency greater than 500kHz
Timing from microseconds to hours
Operates in both astable and monostable modes
High output current
Adjustable duty cycle
TTL compatible
Temperature stability of 0.005% per °C
you can Visit the link for more details
http://courses.ncsu.edu:8020/ece480/common/htdocs/480_555.htm#description
http://courses.ncsu.edu:8020/ece480/common/htdocs/pdf/555AN.pdf
Friday, June 19, 2009
Tuesday, June 9, 2009
What makes u an Effectual Lecturer?
Please Read it Carefully!!!
1. Doesn't spoon-feed the students, even when they beg and beg and beg. Never hand out full text notes, or make them available.
2.Stimulates futher thinking and reading rather than provides thedefinitive answer for all time. But doesn't shy from conclusions either.
3.Gives you an account of the views of others, but is unafraid to givetheir own opinion - with passion if necessary. Prejudice is a wonderfulpedagogical tool!
4. Gives a brief but quality reading list.
5.Is disciplined about questions, and is even quite harsh with ramblingor hectoring questioners if necessary. Perhaps he or she makes clearhow questions are going to run before the lecture. If there is no time,then tough.
6. Is disciplined about discussions or other in class activities.
7. Does check to see if he or she is being listened to, and asks for clarification questions.
8. NEVER belittles other students for a laugh. In fact, is secure enough not to have to be funny all the time.
9. Makes time for female students to ask questions, speak, talk, interact etc.
10. Starts on time/finishes on time.
11. Never or rarely runs out of time: but each lecture is presented whole.
12. Makes an effort to communicate with colour and variety.
13. Isn't obsessed with powerpoint.
14. Provides a simple outline. One A4 sheet is sufficient.
15. Appears to be enjoying him/herself.
16. Gives clear and simple information about assessment. Doesn't spend too long fussing about it.
17. Is accessible outside the class room.
18. Knows what he or she is actually talking about.
19. Is not defensive when questioned, but firm.
Good Day!
1. Doesn't spoon-feed the students, even when they beg and beg and beg. Never hand out full text notes, or make them available.
2.Stimulates futher thinking and reading rather than provides thedefinitive answer for all time. But doesn't shy from conclusions either.
3.Gives you an account of the views of others, but is unafraid to givetheir own opinion - with passion if necessary. Prejudice is a wonderfulpedagogical tool!
4. Gives a brief but quality reading list.
5.Is disciplined about questions, and is even quite harsh with ramblingor hectoring questioners if necessary. Perhaps he or she makes clearhow questions are going to run before the lecture. If there is no time,then tough.
6. Is disciplined about discussions or other in class activities.
7. Does check to see if he or she is being listened to, and asks for clarification questions.
8. NEVER belittles other students for a laugh. In fact, is secure enough not to have to be funny all the time.
9. Makes time for female students to ask questions, speak, talk, interact etc.
10. Starts on time/finishes on time.
11. Never or rarely runs out of time: but each lecture is presented whole.
12. Makes an effort to communicate with colour and variety.
13. Isn't obsessed with powerpoint.
14. Provides a simple outline. One A4 sheet is sufficient.
15. Appears to be enjoying him/herself.
16. Gives clear and simple information about assessment. Doesn't spend too long fussing about it.
17. Is accessible outside the class room.
18. Knows what he or she is actually talking about.
19. Is not defensive when questioned, but firm.
Good Day!
Friday, May 22, 2009
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