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The practical application of the 555 timer

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Uploaded on Aug 24, 2011

The practical application of the 555 timer The timer SE555/NE555, developed by the company "Signetics Corporation" 30 years ago, also called "The integral timer", currently refers to the most popular integral circuits. After it appearerd on the market, the microcircuit has gained high popularity both among amateur of electronics and professionals. The microcircuit functions in a broad range of voltages - from 5 to 15 V. The device is typically released in a plastic DIP-frame, although it was occasionally released in a round metal frame. The timer basically works in two regimens. The first regimen is that of a stable multivibrator and impulse generator, that is, the microcircuit produces a sequence of rectangular impulses. If you look at the structural scheme of the timer, you will see that the volumetric insides contain quite a number of separate elements: over 20 transistors, almost 15 resistors and even two diodes. Now let us briefly enumerate the functions of the microcircuit outlets. 1 - the earth, that is clearly, mass. 2 - the comparator inlet No 2. As the low-level impulse is supplied to the inlet the timer is started and a high voltage is established on the outlet. 3 - the outlet. The outlet voltage changes along with the supply voltage. 4 - the reset. As the low voltage is supplied onto this outlet, the reset of the outlet into the low level state takes place regardless of the current timer regimen. 5 - the control. This outlet provides access to the supporting voltage of the comparator No 1. Using this outlet helps broaden the timer control capacities significantly. 6 -the stop. Is used for stopping the timer and bringing the outlet to a low-level state. 7 - the discharge. The outlet may be applied as auxiliary outlet. The loading capacity is is comparable to that of the common timer outlet. 8 - the supply. This is the positive supply inlet. Let us look how the timer works. The working capacity of this component may be checked by means of a simple circuit tester. Let us supply 90 V onto the circuit. The perfect working state of the microcircuit is indicated by the twinkling of the two light-emitting diodes, included into the tester circuit. Any alteration of the working regimen, that is deviation from the given regimen, means complete malfunction of the ...

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