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The door of entry NAND is followed of a trigger of Schmitt who is used to improve quality of the signal, then come two reversers which control the chain of dividers. By basing you on the results obtained, you can build the table of operation of the bidirectional buffer indicated figure 17 which can be summarized schematically by figure To carry out the following experiments, it will be necessary to use a meter. Static page of welcome. In the preceding practices, you tried out various types of meters ; that that you will examine now is not different from the others as for its design, but it has the great advantage of containing 12 stages in a single integrated circuit.
Electronic forum and Infos. Operational test of a Meter on 12 floors. Indeed, when SW0 is in position 1the passage of the signal in the direction of A8 with B8 is authorized.
IC 74LS245/74245 DIP20
To contact the author. Electronic forum and Poem. L1 ignites with its full intensity.
Now reverse the direction of transmission by applying the rectangular signal provided by CP1 to the B8 entry. This is due to the fact that the exit of door 2 of 74254 15 is at the high level whereas that of door 1 is on the bottom grade thus prohibiting the B8 direction towards A8.
Datasheet(PDF) – Fairchild Semiconductor
In this first phase, you will check the operation of the one of the eight bidirectional buffers of the integrated circuit. Observe what occurs on A8. You can notice the sign represented inside each buffer ; it indicates that the buffers used 742455 a circuit of re-arrangement of the trigger type of Schmitt.
You thus noted that L1 can be ordered independently of the buffer which, not validated, does not intervene. After the sixteenth clock pulse, 744245 incrementing of the indication of the bill-posters starts, this one being in hexadecimal code, of 00 to finish to FF at the end of counting. The figure b represents the diagram of the electric circuit carried out.
The meter can go from 0 to 2 12 positions. On the twelve exits of Q1 with Q12one finds a number binary of ix bits active of: A higher tension could damage it. By commenting on the experiment, one can say that each stage of the meter carries out a division by two of the frequency of the signal applied to its entry 742455 if one injects the signal with 10 Hzcoming from contact CP1at the entry f 1 of the meter, the various exits, one obtains signals whose frequency is each time reduced by half.
Will finally know that the circuit 74LS 742455 a circuit of technology T. It presents a luminosity weaker than the normal. The meter is incremented each time the entry f1 passes from the high level on the bottom grade, i. Carry out then the connections necessary. Indeed, Uc still flickers, ordered by the signal coming from CP1 ; on the other hand L1 does not flicker any more.
ci At boundaries 2, 3, 4, 5, 6, 7, 8 and 9 can be connected eight lines of A1 to A8and eight others can be connected to pins lc, 17, 16, 15, 14, 13, 12 and 11 of B1 with B8. It is thus enough to a little attention to observe the phenomenon and if there would remain some points obscure, do not hesitate to start again several times the experiment. As you can note it, the frequencies spread out of 5 Hz with 0, Hzi.
SN , Tube SN; Röhre SN ID, IC – Integra
The most significant bit M. Return to the synopsis. How to make a site? To carry out the experiments envisaged in this practice, it will be necessary for you to use the following material: The entry RESET gives the meter to zero, it is asynchronous ; as soon as a level H is applied to him, the meter passes to 0.
Form of the perso pages.