RU1798895C - Multivibrator - Google Patents

Abstract

Usage: in the field of pulsed technology, in computing and digital-analog measuring equipment. SUMMARY OF THE INVENTION: in a multivibrator containing an RC circuit 8, two electronic switches 9, 10, by introducing inverters 1. 2, a capacitor 3 and resistors 4, 5 into the feedback circuit, the stability of the temporal characteristics of the generated pulses is improved and the field of application is expanded multivibrator by providing the possibility of obtaining two sequences of output pulses, shifted in time, as well as separate adjustment of the pulse duration and the duration of the pause. 2 ill.

Description

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The invention relates to the field of pulsed technology and can be used in computing and digital-analog measuring equipment

The aim of the invention is to increase the stability of the temporal characteristics of the generated pulses and to expand the scope. .,:

Figure 1 presents a schematic diagram of a multivibrator.

The multivibrator contains logic elements 1 and 2, a capacitor 3, two resistors 4 and 5, a common bus and a power supply terminal, respectively 6 and 7; RC circuit 8, two electronic switches 9. and 10, resistor and capacitor of the RC circuit, respectively 1.1 and 12 .;

The output of logic element 1 is connected to the input of logic element 2 and the input of the electronic switch, 9, and the output of logic element 2 through / capacitor 3 is connected to a common connection point of the terminals of resistors 4 and 5. Between common bus 6 and terminal 7 of the source: an RC circuit 8 is connected to the power supply, the output of which is connected to a common connection point of the first output of the electronic switch 9 and the input of the electronic switch 10, the first output of which is connected to the common connection point of the first output of the resistor 4 and the input of logic element 1.;

The common connection point of the second outputs of the electronic switches 9 and 10 is connected to a common power supply bus, terminal 7 of which is connected to a common connection point of the terminals of the resistor 5 and the resistor 11 of the RC circuit 8,. ; :; -:; The device operates as follows, at the time of switching off the supply voltage, the voltage value on the plates of the capacitor 12 of the RC circuit 8 and at the input of the electron switch 10 is zero (see Fig. 2a), the outputs of which are open and, therefore, at the input of the logic element NOT 1. (see Fig. 2c) and at the output of the logic element NOT 2 there will be a high level of voltage, and at the input of the electronic switch 9 there will be a low voltage level, the outputs of which will be open, therefore the capacitor 12 of the RC circuit 8 will charge. press through the resistor 11. At time ti when the voltage across the capacitor 12 of the RC circuit 8 reaches a threshold value at the input of the electronic switch 10, the outputs of which are closed at the input of the logical element NOT 1 (see, Fig.2c) and at the output of the logical the voltage will be low, and at the input of the electronic switch 9 (see Fig. 2d) there will be a high voltage level at which the outputs of the electronic switch 9 are closed and the capacitor 12 is discharged (see Fig. 2a) RC- circuit 8. On

the input of the electronic switch 10, there will be a low voltage level, its outputs will be open and the capacitor 3 (see Fig. 2b) will start charging through the resistor 5 and the open output of the logic element NOT 2,

At time t2, when the capacitor 3 (see FIG. 2b) reaches a voltage equal to the threshold value of the logic element NOT 1 at its output, and, as a result, at the input of the logical element NOT 2 and

at the input of the electronic switch 9 (see Fig. 2d), the voltage will be low, while its outputs will open and the capacitor 12 will begin to charge through the resistor 11 of the RC circuit 8 (see Fig. 2a). Process

will be repeated with a pulse of duration tu and a pause of duration tn.

The proposed multivibrator provides an increase in the stability of the pulse duration and the pause of the generated pulses, as well as the possibility of obtaining two sequences of output pulses, shifted in time, and separate adjustment of the pulse duration and pause duration,

and, therefore, the duty cycle of the pulses, which expands the scope of the multivibrator.

Claims (1)

SUMMARY OF THE INVENTION A multivibrator comprising an RC circuit, the output of which is connected to the input of the first and with the first output of the second electronic switches, the RC resistor is connected with a power supply bus, and a capacitor with a common bus and a second output of the second electronic switch circuit reverse. communication enabled between the first output the first and the input of the second electronic switches, characterized in that, with in order to increase the stability of the temporal characteristics of the generated pulses and expand the scope, the feedback circuit contains two series-connected inverters, the input of the first of which, through two series-connected resistors, is connected to the power supply bus, the connection point of the resistors through a capacitor is connected to the output of the second inverter, while the input the first inverter is the input of the feedback circuit, and the connection point of the inverters is its output, the second output of the first electronic switch is connected to a common bus. Z wccl U then   . - -. xt- r. "3f I to 0 hell / c - g hell tt t2 Figure 2