SU1358070A1 - Univibrator - Google Patents

Abstract

The invention can be used in external devices of an EC computer. The purpose of the invention is to increase the stability and accuracy of regulating the duration of the generated pulses. , The one-vibration 1 consists of an RS-trigger built on elements 2I-NOT 2 and 3, a matching element 2I-NO 4, a separation diode 5, elements AND-NO 9 and 10, the one-vibrator is equipped with a control bus 11, a transistor 8 and a trimmer a resistor (p) 7. In the device, the duration of the generated pulse is directly proportional to the duty cycle of the control pulse and is precisely set to the initial value of P 7. The charging current passing through the time of the driving capacitor 6 along two chains makes it possible to smoothly adjust the time constant - m specifying tse and changing the nominal value P 7 in a large extent and thus accurately set the initial value of the generated pulse duration. 1 ZoPo f-ly, 2 ill. with S cl with

Description

The invention relates to automation and computing technology and can be used in external devices of an EC computer, bench equipment and a computer built on integral elements about

The purpose of the invention is to increase the stability and accuracy of regulating the duration of the generated pulses.

Figure 1 shows the circuit diagram of the one-vibrator; FIG. 2 shows timing diagrams explaining his work.

In the diagrams (fig. 2) U, - the voltage - 15 receives a control pulse position on the start-up bus, Uijop - voltage on the control bus; U is the voltage at the time of the driving capacitor; . - voltage threshold of the operation of the matching element 2I-NOT; & bus voltage on the output bus

The one-shot contains the single-shot 1 itself, consisting of a short-circuit trigger built on elements 2I-NO 2 and 3, a matching element 2I-NOT 4, separation diode 5, the cathode of which is connected to the Q-output of the trigger, and the anode to the first output time set capacitor 6 and the first input of the matching element 2I-NOT .4, the output of which is connected to the R input of the trigger, the Trimmer resistor 7 is connected between the anode of the separation diode 5 and the emitter of the transistor 8, the base of which is connected to the output of the element AND-HE 9 whose input connected to the output element and AND-NOT 10, the last Input is connected to the INPUT of the matching element 2-NOT 4 and the bus 11 control. The first input of the element 2I-HE 2, which is the S-input of the RS flip-flop, is connected to the start bus 12, and the output of the element 2I-HE 2 is connected to the output bus 13 of the single vibrator I

The one-shot works as follows

In the initial state, when the negative polarity triggering negative polarity on the single-vibrator 1 start bus 12 is absent, its output bus 13 has a zero potential, the charging capacitor 6 is charged with current flowing through the input resistance of the matching element 2I-HE 4, separation diode 5 and the output resistance of the open element 2I-NOT 2. When on the bus 1 control of the one-shot 1 is absent

There is a positive impulse control pulse, at the output of the NANDI element 9, a zero potential acts, ensuring the closed state of the transistor 8o

An input trigger of negative polarity, which enters the launch bus 12 of the single vibrator 1, sets the input trigger to one state, in which a high potential acts on its output bus 13. At the same time, on the control bus 11 of the one-shot 1

The transistor 8 is in the open state and the current flows through the trimming resistor 7. During the action of the control pulses, the charging capacitor 6 reloads through the input and output resistance of the matching element 2I – HE 4 and connected in parallel

To the input resistance, the trimming resistor 7. When the control impulse is terminated, the transistor 8 goes into the closed state, the input and output impedance of the matching element 2IL-HE 4 are disconnected from the time of the setting capacitor 6, the potential remains on it until the next control impulse arrives. Consequently, the time setting capacitor is discharged during the supply of pulse signals and is disconnected from the circuit during the absence of these pulses.

If the amplitude of the voltage is control-,.

pulses equal to the supply voltage of the elements 2I-NOT 2 and 3, then the elements AND-NOT 9 and 10 can not be used. The single-oscillator is characterized in that the AND-HEY element 10 is an open-collector element, this provides the most preferred mode of operation for the transistor 8. Thus, the duration of the generated pulse is directly proportional to the duty cycle of the control pulse and is precisely set to the initial value of the sub; The charge current time of the drive capacitor 6 is made up of

flowing through the input impedance of the matching element 2И – НЕ 4, and the current flowing through the trimming resistor 7, the passage of the charging current

of torus 6 in two chains, it makes it possible to smoothly adjust the time constant of the time of the master circuit when changing the nominal size of the subcontrol resistor 7 within large limits and, thus, to precisely set the initial value of the duration of the generated pulse.

Claims (1)

Invention Formula 1, a one-vibration device containing an input RS-trigger built on two elements 2I-NOT, whose S input is connected to the startup bus, a separation diode connected by a cathode to the Q output of the trigger, and the anode to the first terminal of the time of the setting capacitor and the first input of the matching element 2I-NOT, the output of which connected to the second output condensate1,  30/7 Pa and R-input RS-flip-flop, which is due to the fact that, in order to increase the stability and accuracy of regulating the duration of the generated pulses, a control bus connected to the second input of the matching element 2I-HE and to the circuit of series-connected the first and second elements of the NAND, working as an inverter, a transistor and a trimming resistor, connected between the first pin of the time of the driving capacitor and the emitter of the ranzistor, the collector of which is connected to the power source and is connected via a resistor to the base Noah to the output of the second element IS-NOT, 2, The one-vibrator according to claim 1, which is based on the fact that the second element IS-NOT is an element with an open collector Jz Out Editor I. Shulla Compiled by O. Bliznyuk Tehred M. Order 6007/55 Circulation 900 Subscription VNIIPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4 Figg Proofreader M.Sharoshi