SU415783A1 - - Google Patents

Description

The invention can be used in the field of pulsed technology.

Known waiting multivibrator containing the input and output transistors, to the base of the latter through one capacitor connected in parallel with a diode and connected to one plate is the time of the driving capacitor.

A disadvantage of the known multivibrator consists in a considerable recovery time.

In order to reduce the recovery time in the proposed multivibrator, the base and one of the electrodes of the additionally inserted transistor and diode, respectively, are connected to the input transistor collector, the emitter and the other electrode of which are connected and connected to the second plate of the time of the driving capacitor; an additional transistor collector is connected directly to the power rail.

The drawing is a schematic diagram of the proposed standby multivibrator.

The multivibrator contains input and output transistors 1 and 2, respectively, connected according to a common emitter circuit, the collectors of which are connected via a resistor 3 and 4 to a power bus, time sets the capacitor 5, the chain sets the offset at the output transistor and consists of diode 7 and a resistor 8, a parallel-connected resistor 9 and a capacitor 10, forming a feedback circuit through which the collector of the output transistor is connected to the base of the input transistor, the donator inputted by the diode 11 and the trans a resistor 12, a diode 13 through which the base of the input transistor is connected to a source of zapzskayuschih pulses, and a capacitor 14.

One plate of the time of the driving capacitor 5 is through a diode 7 and a capacitor 14 connected in parallel to the base of the output transistor 2; The secondary transistor 12 collector is connected directly to the power bar.

In the initial state, transistors 1 and 12 are locked, and transistor 2 is open. When a negative-polarity trigger pulse arrives at the base of the transistor 1, the input transistor 1 opens, and the time of the set-point capacitor 5 begins to discharge through resistor 6, diode I and open transistor 1.

The output transistor 2 at the time of the discharge time of the driving capacitor 5 is in the ground state. After the capacitor 5 is discharged, the multivibrator returns to its initial state: transistor 2 opens, and transistor 1 closes. The timing of the driving capacitor 5 is charged, and its charging current is turned off by the transistor 12. Subsequently, the charge is restored to the capacitor 5 through the open transistor 12, which significantly reduces the recovery time of the original multivibrator.

During the working cycle, the pending multivibrator is insensitive to incoming signals; if the recovery time is short compared with the follow-up period of the input signals, then the multivibrator can be used as a stable frequency divider of periodic signals.

Subject invention

L (blowing multivibrator containing an output transistor, the collector of which is connected through a resistor and connected in parallel between a resistor and a capacitor with a power bus and the base of the input transistor, respectively, and to the base of the output transistor through

the capacitor and the diode are connected to one of the time plates; the driving co-capacitor, characterized in that, in order to reduce the recovery time, a base is connected to the collector of the input transistor

electrodes of an additionally inserted transistor and a diode, the emitter and another electrode of which are connected to the second plate of the time of the driving capacitor, the collector of the additional transistor being connected directly to the power bus.