SU1495980A1 - Controlled one-shot multivibrator - Google Patents

Abstract

The invention can be used in devices for forming pulses and delays. The purpose of the invention is the expansion of the field of use due to the automatic discrete setting of the duration of the generated pulse. This quality is achieved by equipping the standby multivibrator (elements 1-1 ÷ 1-10) with parallel circuits connected to an interconnecting capacitor 1-1, and each parallel circuit contains a series connection of a two-terminal 3 with a Zener diode and key element 4, an input control is connected to the corresponding input bus, and the input buses through the input element OR are connected to the start input of the standby multivibrator. The above set provides a discrete reference to p voltage capacitor for a time predetermined at the time of exposure of the input start pulse, which allows to vary the duration of the output pulse, depending on which of the start pulse is input. 2 Il.

Description

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The invention relates to a pulse technique and can be used in pulse shapers, in delay devices.

A: The purpose of the invention is to expand the use of the waiting multi- to 1-brat by providing an automatic discrete setting of the duration of the generated pulse at the moment n: 5 of the starting pulse start.

 FIG. 1 shows a functional diagram of a controlled standby multivibrator; on. 2 - voltage plots on the first U ,, second U.ji n and, NM 1) 4 N inputs of the controlled waiting multivibrator, the output of the N-input element 1 U U, time specifying K |) sensor Uc and output V, controlled standby multivibrator in the process of its operation ...

The controllable standby multivibrator comprises a standby multivibrator 1 including a time specifying a capacitor 111 ,. the first plate of which is connected to the collector of the first bipolar transistor 1.2 and through a resistor to the power supply bus, and the secondary {to the base of the second bipolar transistor 1.4 and through the 1.5 to the power supply bus the power supply of the first bipolar transistor 1i2. is connected through a capacitor 1.6 with the signal input of the waiting multi- Biii6paTopa 1 and through a resistor 1.7 with W111NY of the power supply, and through re- 3i | iCTOp 1.8 - with a common bus; the second bipolar transistor 1. Combined and through a resistor 1.9 are connected with a common busbar, and the Btoporo collector of the 1.4 bipolar transistor, which is the output of the standby multivib ™ raTor 1, draws a 1.10 resistor connected to the H (feH with the power supply bus, N-BXO dual element 1shi 2, N bipolar 3.N) with current-voltage characteristics corresponding to the current-voltage characteristics of the zener diodes and N keys 4.1-4.N, and the signal input of the waiting multivibrator 1 is connected to the output of the N-input element OR 2, N of the control inputs of the keys 4.1-4.N are combined with the corresponding inputs of the N-input element- T, ft OR 2 and are the N-th inputs - ravl emogo monostable multivibrator, the first poles of two-terminal 3.1-3.N

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are connected to the outputs of the corresponding keys 4., 1-4.N, the signal inputs of the keys 4.1-4.N are interconnected and - connected to the first facing of the time - driving capacitor 1.1, and -connected second poles of the two-terminal 3.1-3.N connected to the second plate is the time of the setting capacitor 1.1.

The controlled standby multivibrator operates as follows.

In the steady state, the voltage on the time of the driving capacitor 1.1 Uc is equal to E. At the moment when the start pulse arrives at one of the inputs, for example, the key 4.p opens and, since U (; n, the time of the driving capacitor 1.1 along the circuit; the first plate is the time of the setting capacitor 1.1-- the signal input of the key 4.P - the output of the key 4.p - the first pole of the two-port Z.p - the second pole of the two-terminal Z.p - the second plate of the capacitor 1.1 until Uc becomes equal Ucr.... The value of the time constant r, the fast discharge circuit capacitor 1.1 is chosen small so that the discharge takes place before the start of the start pulse. At the same time, the waiting for multivibrator 1 starts with the start pulse from the output of the N-input element OR 2. The transistor 1.2 opens and the transistor 1.4 closes. The output of the waiting multivibrator begins to form the output a pulse whose duration is determined by a constant time, a discharge circuit, a time of the driving capacitor, a voltage, the driving time of the driving capacitor, and a voltage Uj) to which the time of the driving capacitor is discharged Op. When the voltage is reached, the transistor 1.4 opens and the transistor 1.2 closes. The waiting multivibrator is set to its original initial position.

FIG. Figure 2 shows the voltage plots for the case of trigger signals arriving at other input buses (1.N) of the expected standby multivibrator, while the operation cycle of the controlled standby multivibrator is similar. However, in each specific case, the time specifying the capacitor c. Is charged to voltage values from U. DP cta. 2 depending on which input bus (1.N) a trigger signal arrived.

Therefore, at the moment, the duration of the output pulse corresponds to the number of the input bus to which the input trigger signal is applied (Fig. 2, the output signal of the controlled waiting Uibir multivibrator) I

Thus, a controlled standby multivibrator in comparison with the known ones provides automatic control of the duration of the output pulses depending on which input the trigger pulse arrives.

Claims (1)

Invention Formula A controllable standby multivibrator containing a standby multivibrator, including a time setting capacitor, the first plate of which is connected to the collector of the first bipolar transistor and through the first resistor to the power supply bus, and the second plate is connected to the base of the second bipolar transistor and through the second resistor INNOVATOR of the power source, the base of the first bipolar transistor is connected via a capacitor to the signal input of the waiting multivibrator, through the third resistor to the source bus power supply and through the fourth resistor with a common bus, the emitters of the first and second bipolar transistors are combined and connected through the fifth resistor to the common bus, and the collector of the second bipolar transistor, which is the output of the waiting multivibrator, through the sixth resistor is connected to the power supply bus, t in order to expand the scope of use by providing an automatic discrete setting of the duration of the generated pulse at the moment of arrival of the trigger pulse, an N-input the OR element and N connected in parallel time to the electrical circuit of the driver of the condenser, each of which contains a bipolar circuit connected in series, the volt-ampere characteristic of which corresponds to the Zener diode's volt-ampere characteristic, and the control inputs of each of the N key element are combined with the corresponding inputs The N-input element OR are the N inputs of the controlled standby multivibrator, the output of the N-input element Itrni is connected to the signal input of the standby cartoon vibrator