SU434574A1 - PULSE SERIES GENERATOR - Google Patents

Description

one

The invention relates to radio engineering and can be used in computing devices of an automation system.

A known generator of a series | Pulso) c, containing a Schmitt trigger with a number of input trasistors equal to the maximum number of pulses in the generated series of pulses, which has a bias diode, differentiating chains, diode assembly, resistance of which is connected to the power source .

The disadvantage of this generator is that it cannot form a series of pulses.

The purpose of the invention is the shape of a series of pulses.

For this, the collectors of the input transistors are connected to the outputs of the diode assembly and cascade with the bases of the subsequent input transistors through differentiating chains, and the common point of the diodes of the diode assembly is connected to the base of the output transistor.

The drawing shows the principal electrical circuit of the proposed generator.

The generator contains a Schmitt trigger, transistors 1, 2, 3, 4. Transistors 1, 2 and 3 are input. Their number depends on the maximum number of pulses per series. In this case, their number is three. Transistor 4 is output. In the emitter of transistor 4, a bias diode 5 is turned on. The collectors of transistors 1, 2, 3 are connected to the outputs of a diode assembly 6. The common point of the diode assembly 6 is connected

with the base of the output transistor 4. Transistors 1, 2, 3 are interconnected in cascade through differentiating chains formed by resistors 7 and 8 and capacitors 9 and 10. In the circuit there are also resistors

1.1-17 and capacitors 18, 19, 20.

The generator works as follows. A signal of a predetermined number of negative polarity pulses is supplied by iHa, the corresponding generator command input 21, 22 or 23, the corresponding transistor is opened. In this case, the half-shelf component of the signal is fed to the corresponding input of the assembly 6 and through it to the base of the output transistor 4, causing it to be forced

closing Transition of the output transistor to the open state occurs at the end of the signal and when the magnitude of the negative bias applied to the base of transistor 4 is restored through resistor 14.

Further, all the processes in the circuit are repeated.

Subject invention

A pulse train generator containing a Schmitt trigger with a number of input transistors equal to the maximum number of pulses in the generated imgulsosch series has a bias diode connected to the output transistor, differing in the emitter of the output transistor. so that, in order to form a series of pulses, the collectors of the input transistors are connected to the inputs of the diode assembly and cascade with the bases of the subsequent input transistors through differentiating chains, and The common point of the diode diode assembly is connected to the base of the output transistor.