SU741421A1 - Multivibrator - Google Patents

Description

(54) MULTI-VIBRATOR The invention relates to a pulse technique and can be applied in radio technical equipment in two-channel information processing. A multi-scraper is known, which contains the first and second transistor switches, covered by cross-connectors through time, the driving capacitors, the primary condensate, the first and second diodes rij. However, this multivibrator has insufficient noise immunity. The multivibrator can switch to the self-oscillatory mode of operation from the impact of the interference signal with certain parameters. The purpose of the invention is to increase the disturbance of the protection of the multivibrator and expand the functionality of the device. To achieve this goal, a multivibrator containing the first and second transistor switches, covered by cross-connects through time, the capacitors, the additional capacitor, the first and the second diodes, the anode of the first diode is connected to the midpoint of the time of the driving and additional capacitors, the cathode is connected to busbar, anode of the second additional diode through RC - the circuit is connected to the busbar, thirds and a transistor switch are entered into it, the first and second transistor stages with a common base will be added to the transistor op, the third diode and the second additional capacitor, and the input of the first transistor cascade with a common base is connected to the anode of the first, and the output to the cathode of the second diode, the anode of which is connected to the output of the second transistor cascade with a common base, the input of which through the third diode is connected to the bus power, and through the second additional capacitor - to the output of the third transistor switch, and parallel to the transistor of the first transistor switch an additional transistor is connected.

The drawing shows prnipshialia device diagram.

The device contains the first and second transistor switches 1 and 2, time specifying capacitors 3, 4, additional capacitor 5, diodes 6-9, third transistor switch 10, first and second transistor stages on transistors 11 and 12, additional transistor 13, second additional capacitor 14, resistors 15-27, a storage capacitor 28.

Multivibrator works as follows.

In the initial state, transistors 1, 2, and 13 are closed. Transistor 1 is closed by the voltage from the divider formed by resistor 15 and diode 9 supplied to the emitter of transistor 1, the base of which is connected to common bus through resistor 17. The base of transistor 2 through a resistor 18 is also connected to a common bus. The transistor 13 is closed by the voltage of the input circuit.

The positive signal POLA5PNOST (recording signal) opens the transistor 13 and the capacitor 5 is discharged along the collector-emitter transistor 13, the common bus, the capacitor 28, the diode 7, the collector-emitter of the transistor 11. The capacitors 5 and 28 form a capacitive voltage divider, moreover, the capacitance of the capacitor 28 is much higher than the capacitance of the capacitor 5. After the end of the input pulse, the transistor 13 shuts down, and the half-voltage overvoltage formed on the collectors of transistors 2 and 13 charges the metering capacitor 5 along power regular enrollment, resistor 19, capacitor 5, the diode 6.

With the arrival of the next input pulse, the cycle repeats. In this case, a negative relative to common bus voltage is formed on the capacitor 28, which displaces the operating point of the volt-ampere characteristic of the diode 7 in the opposite direction. This leads to a decrease in the discharge current when the capacitor 5 is recharged and, consequently, to an increase in its recharge time. On the left side of the capacitor 5, a negative relative to the common bus voltage that shifts the operating point of the current-voltage characteristic of diode 6 in the opposite direction, which leads to increasing the charge current component of the capacitor 5 through

the capacitor 3 and the resistor 17 and the reduced component of the charging current through diode 6; When a specified number of pulses arrive at the input, the component of the charging current of capacitor 5 through the capacitor 3, resistor 17, the emitter-base junction of transistor 1 will become sufficient for unlocking the transistor 1 Transistor 1 opens, capacitor 4 is discharged through the collector-emitter circuit of transistor 1, diode 9, resistor 18. A negative voltage arising on resistor 18 keeps transistor 2 closed. With the end of the discharge of the capacitor 4, the transistor 1 closes the positive differential from its collector enters the base of the transistor 2. The multivibrator goes into self-oscillating mode of operation, with the negative voltage on the storage capacitor 28 retaining its value due to the branching off of the portion of the discharge current of the capacitor 5 .

The number of pulses required to start the train; -th multivibrator, is determined by the ratio of the capacitors of the cops 5 and 28, the resistance of the discharge resistor 23, the voltage of the power supply and the threshold of the unlocking of the transistor 1.

The channel description works similarly to the recording channel. The transistor 10 in its initial state is open by the input circuit voltage and is in saturation mode, and the metering capacitor 14 is charged across the circuit., Power supply, diode 8, capacitor 14, resistor 25, collector-emitter of the transistor 10. With the arrival at the input the negative polarity pulse transistor 1O closes and starts discharging the metering capacitor 14 through the transistor 1 2, the storage capacitor 28, the common bus, the internal resistance of the source1-scale w-htagsh, resistors 26 and 25. This occurs until condensate p 14 is not recharged during the time of action of the analog pulse. Each time a pulse is written off, the process repeats. Obviously, if the process spibiBamsi prevails over the record, then the multivibrator does not go into autocollection. banty mode of operation.

Circuits similar to the multivibrator described can be used in various automation devices as contactless turnips and sensors as well as in static physics as a measure of the intensity of random flows. The proposed multivibrator, made in the form of a hybrid integrated microcircuit, can be used in two-channel signal processing circuits for jammed small-sized radio equipment. The invention of the multivibrator containing the first second transistor switches, covered by cross-connectors through time specifying capacitors, additional capacitor, first, second diodes, the anode of the first diode, the cathode of which is connected to the common bus, the second anode to the middle point the diode through an RC circuit is connected to a common bus, characterized in that, in order to increase noise immunity and enhance functionality, a third transistor key is introduced into it, the first The second and second transistor cascades with a common base, an additional transistor, a third diode and a second additional capacitor, the input of the first transistor cascade with a common base poklyuyu to the anode of the first, and the output to the cathode of the second diode, the anode of which is connected to the output of the second transistor cascade common base, the input of which through the third diode is connected to the power bus, and through the second additional capacitor to the output of the third transistor switch, and in addition to the transistor of the first transistor switch tion transistor. Sources of information taken into account during the examination 1. USSR author's certificate N 451173, cl. H 03 K 3/281, 08.09.72 (prototype).

Claims (1)

Claim A multivibrator containing the first and second transistor switches, covered by cross-connections through time-setting capacitors, an additional capacitor, first, second diodes, the anode of the first diode is connected to the midpoint of the time-setting and additional capacitor, the cathode of which is connected to the common bus, the anode of the second diode via RC - a circuit connected to a common bus, characterized in that, in order to increase noise immunity and extend functionality, a third transistor switch, the first and second transistor are introduced into it cascades with a common base, an additional transistor, 5 a third diode and a second additional capacitor, the input of the first transistor stage with a common base connected to the anode of the first, and the output to the cathode of the second diode, the anode of which is connected to the 10 output of the second transistor stage with a common base the input of which through the third diode is connected to the power bus, and through the second additional capacitor to the output of the third transistor switch, 15 a additional transistor is connected in parallel with the transistor of the first transistor switch .