SU615592A1 - Pulse generator - Google Patents

Description

one

The invention relates to a pulse technique. The generator can be used to receive one-time commands normalized by time.

A pulse generator is known that contains a timing circuit, the capacitor of which is connected to the power supply bus with one plate, and the other through parallel connected circuits consisting of each resistor and diode, with a reference capacitor, and with a single input of the differential amplifier. The other input of the latter is connected to a voltage divider on the resistors, and the output is connected to a voltage divider consisting of a resistor and a diode, and with the base of the first transistor of the switching cascade. The collector of this transistor is connected through a resistor to the power supply bus and through another resistor to the base of the second transistor of the opposite type of conductivity of the switching cascade, the emitter of which is connected to one power supply bus, and the collector is connected to another source bus

power supply 1. However, this generator does not allow to obtain single stable pulses of different fixed duration.

For the purpose of obtaining single stable pulses of various fixed durations into a pulse generator, which contains a time driving circuit, the capacitor of which is connected to the power supply bus and the other to one of the inputs of the differential amplifier, the other input is connected to the voltage divider resistors, and the output - with a voltage divider consisting of a resistor and a diode, and with the base of the first transistor of the switching cascade, the collector of which is connected to the source bus, power supply and through another p A resistor with a base of the second transistor of the opposite conductivity type of the switching cascade, the emitter of which is connected to the single power supply bus, and the collector through a resistor - to a different power supply bus and through parallel connected chains, each consisting of a resistor and a diode, with a time specifying capacitor, resistor, key, resistors and transistor are entered. The collector of the latter is connected to the emitter of the first transistor of the switching cascade, the emitter is connected to the power supply bus through a resistor, and the base is connected to the other power supply bus through a resistor and switch and to the collector of the second transistor of the switching cassette through another resistor.

The drawing shows a diagram of the generator.

The pulse generator contains a differential amplifier with transistors 1 and 2, a time setting capacitor 3, parallel-connected circuits on diodes 4, 5 and resistors 6, 7, a voltage divider on resistors 8 and 9, a voltage divider on diode 10 and a resistor 11, switching a cascade on transistors 12 and 13, a transistor 14, a switch 15, resistors 16-20, and power supply wiring 21, 22. The capacitor 3 is connected between the thickness 22 and the base of the transistor 1 connected to the combined cathode of diode 4 and the anode of diode 5, the other electrodes of which are connected respectively via resistors 6 and 7 to the collector

a transistor 13 connected via a resistor 19 to the base of transistor 2 is connected via resistors 8 and 9, respectively, to wounds 21 and 22. The buses are connected through a diode 10 and a resistor 11 to the outputs of the differential amplifier and the base of transistor 12, the emitter of which is connected to the collector of the transistor 14. The emitter of the latter through a resistor 17 is connected with a length of 21, and the base through a resistor 16 is connected to a collector of a transistor 13 and through a resistor 18 with a single contact of a switch 15, the other contact of which is connected to a thickness of 22.

The generator works as follows.

When the supply voltage is applied, capacitor 3 begins to charge through resistors 20, 6 and diode 4. At the moment of charging the capacitor, when the voltage across it is lower than the potential at the emitters of transistors 1 and 2, transistor 1 is closed and accordingly transistors 12, 13 and 14. When the voltage across the capacitor exceeds the potential at the emitters of transistors 1 and 2, transistor 1 opens, transistors 12, 13 and 14 will remain in the initial state, because the feedback circuit is interrupted due to the presence of transistor 12 in the emitter circuit. closed transistor 14, and a generator The device goes into suspend mode.

When the electronic or mechanical switch 15 is short-circuited (for a time shorter than the duration of the generated pulse), the transistor 14 opens, the feedback circuit closes and the transistors 12, 13 and 14 go into saturation mode. In this case, a pulse is generated at the generator output, the duration of which is determined by the parameters of the master circuit time.

The capacitor 3 is discharged through a resistor 7, a diode 5 and a transistor 13 until the voltage on the capacitor drops below the voltage at the base of the transistor 2. After that, an avalanche process develops, returning the circuit to a state where the transistors 1 , 12, 13

and 14 are closed.

After charging the capacitor 3, the transistor 1 opens, and transistors 12, 13, and 14 remain in the closed state and the generator circuit goes into standby mode. When the key 15 is permanently closed, the generator switches to the self-oscillation mode.

Claims (1)

1. USSR author's certificate No. 325691, cl. H 03 K 1/12, 1972. ®S ft 22