555 Timer

The 555 timer IC is an amazingly simple yet respective(a) device. It has been around now for many years and has been reworked into a deed of different technologies. The two primary versions today are the passe-partout bipolar design and the more recent CMOS equivalent. These differences primarily fix the amount of power they require and their maximum frequency of consummation; they are pin-compatible and useablely interchangeable.
This page contains only a translation of the 555 timer IC itself. Functional circuits and a few of the precise wide range of its possible applications will be cover in additional pages in this category.
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The figure to the right shows the functional block diagram of the 555 timer IC. The IC is available in any an 8-pin round TO3-style can or an 8-pin mini-DIP package. In either case, the pin connections are as follows:
1. Ground. 
2. Trigger remark. 
3. Output. 
4. Reset stimulant drug. 
5. ascendancy emf. 
6. Threshhold input. 
7. Discharge. 
8. +VCC. +5 to +15 volts in normal use.



 
The operation of the 555 timer revolves around the three resistors that form a voltage rail-splitter across the power supply, and the two comparators connected to this voltage divider. The IC is quiescent so long as the trigger input (pin 2) remains at +VCC and the threshhold input (pin 6) is at ground. Assume the fix input (pin 4) is also at +VCC and therefore inactive, and that the control voltage input (pin 5) is unconnected. Under these conditions, the output (pin 3) is at ground and the release transistor (pin 7) is turned on, thus grounding whatever is connected to this pin.
The three resistors in the voltage divider all eat up the same value (5K in the bipolar version of this IC), so the comparator reference voltages are 1/3 and 2/3 of the supply voltage, whatever that may be. The control voltage input at pin 5 can directly simulate this...If you want to get a full essay, order it on our website: Orderessay



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