SU488322A1 - Multivibrator - Google Patents

Description

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The invention relates to a pulse technique. The multivibrator can be used in geierator. X nr-angle pulses.

The known multivibrator, which contains a transistor differential amplifier with a current source in the emitters of transistors, two times the driving capacitor, cross-connected between the collectors and the bases of the transistors of the differential amplifier, and the power source with a midpoint, has a short pulse duration.

The purpose of the invention is to increase the duration of the generated pulses. This is achieved by the fact that the bases of the transistors of the differential amplifier are connected to the midpoint of the power source through diodes connected by cathodes to the bases of the respective transistors.

The drawing shows the described multivibrator.

The multivibrator is made according to the cnN MeTpH4 scheme based on a differential amplifier with a stabilized ampertated current, the source of which is a cascade on a transistor 1. The magnitude of the collector current of this transistor is determined by the voltages; power supply 2 and resistors 3, 4 and 5. The differential amplifier is assembled on transistors 6, 7, the time of setting capacitors 8, 9, the voltage source 10, dyod 11, 12 and resistors 13, 14 The multivibrator operates as follows.

When the transistor 7 is open, the capacitor 8 is charged by the base current of this transistor through the trap 1, the power sources 2, 10 and the resistor 13. As the voltage increases, the voltage on the capacitor 8 rises linearly, and on the base of the transistor 7, linearly i. At the same time, the collector potential of the transistor 6 does not change, since a constant current flows through the resistor 13. At this time, the transistor 6 and the diode 11 are closed, and the diode 12 is open, and the previously charged capacitor 9 is discharged through the transistors 7 and 1, the source of voltage 2 and the bottom 12.

The discharge process of the capacitor 9 corresponds to the leading edge of the output pulses, spy from the resistor 14. After the end of the discharge and the potential of the collector of transistor 7 does not change. Since the time of the capacitors is charged with small (base) currents, and discharged by large (collector) currents, the discharge processes take place significantly faster than the charge processes, which leads to an increase in the duration of i-output pulses.

The amplitude and durability of the output pulses of the multi-pulse generator depend on the voltage of the power source 2 and do not depend on the voltage of the source 10.

Subject invention

Multivibrator containing a transistor differential amplifier with a current source at the price of the emitters of the transistors, two times the driving capacitor included

not reasonably different collectors and bases of the transistors of the differential amplifier, and a midpoint nitron source, characterized in that, in order to increase the duration of the generated pulses, the bases of the differential amplifier transistors are connected to the midpoint of the nitride source through diodes connected by cathodes; databases of the corresponding transistors.

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 GSH

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