SU395972A1 - SINGLE VIBRATOR - Google Patents

Description

one

The invention relates to a pulse technique and can be used as a generator of rectangular pulses.

Known one-shot auth. St. N ° 315276 "low noise immunity.

The purpose of the invention is to increase the robustness of the one-shot.

For this, an anode of an additional Zener diode is connected to the base of the additional transistor, the cathode of which is connected to the resistive-capacitor voltage divider.

In the drawing, an electrical circuit of the proposed one-shot is presented.

The single-oscillator contains two normally-closed transistors / and 2, a capacitor 3 and a start-up resistor 4, a start-up delay transistor 5, an on-diode diode (zener diode) 6 and a voltage divider consisting of resistors 7 and 8 shunted by a storage capacitor 9. Resistor Yu is the output impedance of the pulse generator.

The single vibrator works as follows.

When the supply voltage is turned on, the start-up capacitor 3 is charged through resistor 10 (generator output voltage / V) and start-up resistor 4. At the initial moment of charge of the capacitor 3, the notion base of the trap2

the resistor 1 is equal to the source potential. If the emitter of the transistor / were connected to the source, then transistor 1 would be shifted in the forward direction, a positive feedback would occur between transistors 1 and 2, and one selector would cause a false response. Thanks to the wiring of the emistor transistor / to the collector of transistor 5 of this

0 does not occur.

The conductivity of Tpaii3HCTopa 5 in a transient mode depends on the potential of the storage capacitor 9 and the potential barrier of the reference diode 6, and in setting 5 it depends on the size of the resistors 7 and 8. When the pitapp-Eh source is turned on, the package capacitor 9 is charged through the resistor 7. Initially the charge of the tip capacitor 9 of the notscaps of the base of the transistor 5 is equal to the potential of the source -Ek, and the transistor 5 does not conduct. The emitter circuit of the transistor / is disconnected from the source -EI ,. As the capacitor 9 charges through the resistor 7

5, a pot-level operation is increasing at the base of the reference 6. The transistor 5 of the start-up cascade remains locked.

As soon as the potential on the capacitor plate 9 reaches the potential barrier

0 reference dna 6, the last is na

A positive potential appears at the base of transistor 5, and the emitter junction of transistor 5 becomes conductive.

The introduction of the reference diode 6 by the base day of the transistor 5 increases the thermal potential of the charge of the capacitor 9, which increases the charge time of this capacitor and, consequently, the switching-on of the delay stage.

With but paralleling the input of the one-shot start impulse in the total value of the transistors / and 5, a collector current appears equal to the base current of the transistor 2. A positive

The feedback between the collector of the transistor 2 and the base of the transistor 1, and the Oscillator, generates an impulse of a given power.

Subject and d on and e and

Odnovibrator on aut. St. No. 315276, characterized in that, in order to improve the noise immunity, to the base of the additional transistor, the auxiliary switch of the auxiliary laser diode, whose cathode is connected to the resistive-capacitor voltage divider.