SU983987A1 - One-shot multivibrator - Google Patents

Description

(54) SINGLE VIBRATOR

one

The invention relates to computing technology and can be used in various automation devices, remote control and computing technology as, for example, a pulse shaper, delay element, time relay, etc.

Oanobibrators are known that are implemented on semiconductor elements using the time of the R 3 C circuit fl 3 to

.and C23.

The disadvantage of such one-shot is low efficiency, due to the small amplitude of the output pulses, which is part of the voltage of the power supply source 15.

The closest to the proposed chg technical solution is a single-shot, with an overwhelming time setting RC circuit and two transistors of different types of pro-EO emissivity N J.

A disadvantage of the known device is low efficiency, due to the low ratio of the output pulse voltage to the supply voltage value.

The purpose of the invention is to increase efficiency.

The goal is achieved due to the fact that, in a one-shot, which is connected between the power bus and the common bus M, a master RC circuit and two transistors of different conductivity connected according to the equivalent of a two-base diode, the emitter of pnp transistors being connected to the RC- the circuit, and the collector of the transistor connected to the common bus, connected to the output of the device and through the resistor to the power supply bus, as a pnp transistor used a two-emitter transistor connected to the power supply by the second emitter and, rum that introduced a zener diode anode connected to the collector p-n-p transistor, and the cathode - to the output of circuit S.-R,

Claims (3)

The drawing shows a circuit diagram of a single vibrator. One ovibusator is a sdc rk ih pnp transiotor 1, the base and collector of which is connected to the collector and the base of the pnp transistor 2, respectively. The emitter of transistor 1 is connected to a common bus, the first emitter of transistor 2, through a capacitor 3 1 C-circuit is connected to the common bus and through the resistor 4 RC-circuit is connected to the bus 5 power. The collector connection point of the transistor 1 with the base of the transistor 2 is connected to the output 6 of the device and through the load resistor 7 to the power supply bus 5. The anode of the Zener diode 8 is connected to the connection point of the first emitter of the transistor 2 with the capacitor 3 and the resistor 4, the second emitter of the transistor 2 is connected to the start input 9 and through the resistor Yu is connected to the power bus 5. The single-oscillator works as follows. After the power supply is connected, the capacitor is discharged and the transistors 1 and 2 are in the closed state. The capacitor 3 is charged through the resistor 4 from the power supply bus 5. When the voltage on the condenser 3 exceeds the stabilization voltage of the zener diode 8, the latter will open. The current of Zener 8 passes through the base-emitter transition of transistor 1, which leads to the occurrence of collector current of transistor 1, which will shift the base-to-second emitter transition of transistor 2 in the direction and lead to the collector current of transistor 2 and to a larger opening of transistor 1, As a result, an avalanche-like process of opening and ending both transistors will occur. Condensator 3 is discharged across the first emitter of transistor 2 and through the transistors 1 and 2. This process will lead to the initial state of the newly-oscillator, in which both transistors are open and held in a saturated state by the current through the resistor 10, and output 6 is kept low. When a negative pulse is applied to input 9 (or shorting input 9 to a common bus), the current of the second emitter of transistor 2 decreases to zero, and the current flowing through resistor 4 and the first emitter of transistor 2 is not enough to keep transistors 1 in 2 in a saturated state (for this, the large size of the resistor 4 must be sufficiently large), the transistors will close and high potential will be generated at the output 6. Capacitor 3 will begin to charge & through the resistor 4 from the power supply bus 5, after some time, determined by the value of resistor 4 and capacitor 3, the voltage on the capacitor 3 will exceed the stabilization voltage of the zener diode 8, and the current generated through the stabilizer will lead to avalanche-like the switching process of transistors 1 and 2, as a result of which a high potential disappears at output 6, the output pulse is completed, the Zener diode determines the switching threshold of the equivalent of a two-base diode, makes it independent of direct voltage supply device, and due to the absence of the resistor divider for specifying threshold increase is achieved before the output pulse amplitude of the supply voltage and increases efficiency of the device. Claims of the invention: A single-oscillator containing a time setting Rc-Mienb connected between the power bus and the common bus and two transistors: p of different conductivity connected according to the equivalent of a two-base diode, the emitter of a pnp transistor connected to the output of an RC circuit, and the collector of the pnp transistor connected to the common bus by the emitter is connected to the output of the device E through a resistor to the power bus, characterized in that, to increase efficiency, a two-emitter pHbrif transistor is used, connected second emitter . Through a resistor to the power bus and, in addition, introduced a zener diode, an anode connected to the collector of the transistor, and the cathode - to the output RC-. chains. Sources of information taken into account in the examination 1. US patent number 39612О7, cl. N OZ K 3/284, published. 1967, 2. USSR author's certificate number 832710, p. H 03 K 3/284, 1979. 3. USSR author's testimony of lyu 739715, class, and 03 K 3/017. 1976 (prototype). BUT izfs x