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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.
You thus noted that L1 can be ordered independently of the buffer which, not validated, does not intervene. Indeed, when SW0 is in position 1the passage of the signal in the direction of A8 with B8 is authorized. Of course, it is not a question to hope the clock pulses up to to check the table: L0 and L1 flicker then at the rate of 10 Hz.
In this first phase, you will check the operation of the i of the eight bidirectional buffers of the integrated circuit. The meter can go from 0 to 2 12 positions.
As you can note it, the frequencies spread out of 5 Hz with 0, Hzi. High of page Preceding page Following page.
You have just checked the two directions of transmission of the signal between A8 and B8 of the one of the eight ways of the integrated circuit. Form of the perso pages. Rock then SW1 on position 0 to validate the circuit again.
It is about the CDbinary asynchronous meter with 12 bitswhose synoptic diagram is represented figure Forms maths Geometry Physics 1. Static page of welcome.
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 18, 17, 16, 15, 14, 13, 12 and 11 of B1 with B8. Will finally know that the circuit 74LS is a circuit of technology T. The entry RESET gives the meter to zero, it is asynchronous ; as soon as a iic H is applied to him, the meter passes 7424 0.
IC 74LS/ DIP20 (end 7/4/ PM)
Click here for the following lesson or in the synopsis envisaged to this end. To carry out the experiments envisaged in this practice, it will be necessary for you to use the following material: The figure b represents the diagram of the electric circuit carried out.
On the twelve exits of Q1 with Q12one finds a number binary of twelve bits active of: Return to the synopsis. To contact the author. Electronic forum and Poem. L and that, for this reason, it must be fed with a stable tension of 5 V.
This is symbolized by a bubble placed on the entry f1 in figure The electric diagram of the circuit carried out is jc figure b, while the figure c represents its synoptic diagram. 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.
To carry out the following experiments, it will be necessary to use a meter.
IC 74LS245/74245 DIP20
Indeed, L0 still flickers, ordered by the oc coming from CP1 ; on the other hand L1 does not flicker any more. Now reverse the direction of transmission by 7425 the rectangular signal provided by CP1 to the B8 entry. 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.
Carry out then the connections necessary. The table of figure 23 indicates 7425 frequency and the period of the signals of the various stages of the meter and summarizes the test results. It must be in position OFF at the time of its connection on the sector. You can notice the sign represented inside each buffer ; it indicates that the buffers used comprise a circuit of re-arrangement of the trigger type of Schmitt. Observe what occurs on A8.
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Operational test of a Meter on 12 floors. After the sixteenth clock pulse, the 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 meter is incremented 7425 time the entry f1 passes from the high level on the bottom grade, i.
A higher tension could damage it.