555 Timer

The 555 timer IC is an amazingly simple yet respective(a) device. It has been well-nigh now for many years and has been reworked into a deed of assorted technologies. The two primary versions today argon the passe-partout bipolar design and the more recent CMOS equivalent. These differences primarily fix the meter 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 hustle of its possible applications will be cover in supernumerary pages in this category. [pic] [pic] The figure to the right shows the functional block plat of the 555 timer IC. The IC is available in any an 8-pin wheel 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. Ou tput.  4. Reset stimulant drug.  5. ascendancy emf.  6. Threshhold stimulus.  7. Discharge.  8. +VCC. +5 to +15 volts in normal use.  The operation of the 555 timer revolves roughly the 3 resistors that form a voltage rail-splitter crosswise the power supply, and the two comparators connected to this voltage divider. The IC is inactive so long as the trigger excitant (pin 2) body at +VCC and the threshhold excitant (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 t! hat may be. The control voltage input at pin 5 can directly re-create this...If you want to get a full essay, order it on our website: OrderEssay.net

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