Shaper of a given number of pulses. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Digital technology

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The device, the schematic diagram of which is shown in fig. 1, generates any given number of pulses in the range from 1 to 10. It can be used in devices for monitoring the operation of digital nodes, in code or command encoders, in switches, etc.

The shaper differs from the known devices of this purpose in its simplicity of construction, a small number of integrated circuits, and also a low (no more than 4,5 mW) power consumption, which makes it possible to use it in self-powered devices. The pulse repetition rate at the output of the shaper is from 0,1 Hz to 1 MHz (with the ratings of the elements R7, C3 indicated on the diagram, it is approximately equal to 10 Hz), the duty cycle is 2.

Fig.1 (click to enlarge)

The device contains a controlled multivibrator (DD3.2, DD3.3, DD4.1), a counter (DD2), a matching element (DD3.1) and a blocking unit (DD1, DD4.2, VD13).

The number of pulses in the package is determined by the number entered into the counter (using a binary encoder) that complements it up to 10. To get a series of ten pulses, the number 10 is entered into the counter (how the impulse packages are formed in this case will be described later ). The last pulse of the message sets the counter to the zero state (0000), and a voltage appears at the output of the coincidence element, which prohibits the operation of the multivibrator. Binary code signals corresponding to a given number of pulses can be obtained using a diode encoder, the circuit of which is shown in Fig. 2.

Ris.2

At the moment of power-on, a positive pulse arising on the resistor R6 (see Fig. 1) when charging the capacitor C2 sets the counter DD2 to the zero state (0000). At the same time, a high logic level appears at the output of the match element DD3.1, which prohibits the inclusion of the multivibrator and allows parallel recording of binary code signals into the counter (at inputs S1, S2, S4, S8) through the elements of the DD1 chip of the blocking unit. When these signals are received (one of the buttons SB1-SB 10 is pressed), the counter is set to the appropriate state. A low level appears at the output of the DD3.1 element, which creates conditions for starting the multivibrator, and a high level appears at the output of the inverter DD4.2, which quickly charges the capacitor C1 through the VD13 diode and prohibits recording signals through the DD1 chip.

The multivibrator generates pulses with a repetition rate determined by the R7C3 circuit. They go to the input of the counter DD2 and switch it. Since the A2 / 10 input is connected to a common wire, the K176IE2 counter operates as a decade, in which, after state 9 (1001), the first and fourth triggers (and, consequently, the entire counter) are set to zero. At the same time, a high logic level reappears at the output of the DD3.1 element, the multivibrator turns off, and the capacitor C1 is discharged through the resistor R5 and the DD4.2 element. After some time, determined by the chain R5C1. the voltage at the inputs of the elements of the chip DD1 is reduced. to level 0 and the next recording of binary code signals into the counter becomes possible. In other words, this circuit creates pauses between series of impulses; without it, the multivibrator would work continuously all the time while the encoder button is pressed.

A few words about the formation of a series of ten impulses. In this case, the binary number 1010 is entered into the counter, corresponding to the decimal number 10. The first pulse of the multivibrator switches the counter to the state described by the decimal number 11 (binary - 1011). By the next (second) pulse, the first and fourth triggers of the counter are set to zero, while the second one remains at one, which corresponds to the number 2 (0010). Further, the shaper works in the same way as in other cases.

In addition to those indicated in the diagram, any low-power germanium (for example, D9 series) or silicon (D219, KD522A, KD522B, etc.) diodes and K164 series microcircuits can be used in the device. When installing, remember to protect the chips from static electricity.

Establishing the shaper comes down only to setting (selecting resistor R7) the desired pulse repetition rate.

Author: Y. Erivansky, Moscow; Publication: N. Bolshakov, rf.atnn.ru

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