SU923012A1 - Multivibrator - Google Patents

Description

(54) MULTI-VIBRATOR

one

The invention relates to the field of generating electrical pulses and can be used in automation and remote control devices.

Known multivibrators built on the relay. Some of them provide galvanic isolation of control circuits, but lack the ability to control the frequency of the generated pulses (1.

The disadvantage of such multivibrators is the inability to control the frequency.

Also known is a multivibrator containing two relays with one normally closed and one normally open contact, two capacitors, a variable resistor, one winding output of each and one of the plates of each capacitor connected to a common bus, the second winding terminal of each relay is through a normally closed contact to the second plate of the corresponding capacitor, the terminals of normally open contacts of both relays are combined and connected to the power supply 2.

A disadvantage of the known multivibrator is its low functionality, i.e. the inability to control the frequency of the generated pulses, not breaking symmetry.

The aim of the invention is to expand the functionality.

The goal is achieved by the fact that in a multivibrator containing two relays with one

Claims (2)

10 normally closed and one normally open contacts, two capacitors, a variable resistor, one lead-winding of each relay and one of the plates of each capacitor are connected to the common apshe, the second end of the winding of each relay is connected through the normally closed contact to the second plate of the corresponding capacitor, terminals normally open contacts of both relays are combined and connected to gly20 non-power, two diodes are inserted, and their cathodes are combined and connected to one pin of a single resistor, the second pin is a cat It is connected to a common busbar, and the diodes' anodes are connected to the second terminals of the windings and normally closed relay contacts. The drawing shows a schematic diagram of a multivibrator. The multivibrator contains relays 1 and 2, their contacts 1 and 2), capacitors 3 and 4, variable resistor 5, KHonky start 6, isolating diodes 7 and 8, and the windings of relays 1 and 2 are connected to alternating diodes 7 and 8 resistor 5, normally closed contacts Ij and 2j are connected respectively to the windings of relays 2 and 1, normally open contacts 1, and 2i are connected to a power source, and flip contacts of both relays are connected respectively to capacitors 3 and 4. In turn, one of the contacts start button 6 is connected to a power source, and the other obmot ke relay 2. When contacts start button 6, relay 2, and its changeover contact 2i capacitor 3 is energized and charged. When the contacts of the start button 6 are opened, relay 2 de-energizes the capacitor 3 charged to the source potential of the NIN source with normally closed contacts 2j connected to the winding of relay 1, after which the normally open contact li is activated, the capacitor 4 is connected to the power source and charged. The capacitor 3 is simultaneously discharged to the winding of the relay 1 and the variable resistor 5 connected to it through the opening. the potential of the capacitor 3, the diode 7 (while the diode 8 is closed by the same potential). When the voltage on the capacitor 3 decreases to the disconnect voltage of the relay, the relay 1 switches off. The normally closed contact l.j connects the capacitor 4, which is already charged up to the potential of the power supply source, to the winding of the relay 2 which is activated and the normally open contact 2) the capacitor 3 is connected to the power supply and is charged. The capacitor 4 is simultaneously discharged to the coil of the relay 2 and the variable resistor 5, connected to it through the potential of the capacitor 4 diode 8 (the diode 7 is closed by the same potential). When the voltage of capacitor 4 is reduced to the disconnect voltage of the relay, relay 2 is turned off. When the relay is switched off, relay 2 with normally closed contact 4 2i, capacitor 3 charged to the power supply potential is connected to the winding of relay 1 and the operation cycle repeats, i.e. after starting by the start-up element, the multivibrator 6 switches to the self-oscillatory mode. The switching time of relays I and 2 is determined by the capacitance of capacitors 3 and 4, the total resistance of the winding of one of the relays and the variable resistor 5 connected in parallel through one of the open diodes 7 or. 8. By changing the resistance value on the variable resistor 5, the total resistance of the circuit on which capacitors 3 and 4 are discharged changes, thereby changing the switching frequency of relays 1 and 2, i.e. the frequency of the pulses generated by the multivibrator. At the same time, their symmetry is preserved, since the setting of variable resistor 5 equally changes the value of the master circuit of both arms of the multivibrator. Invention Multivibrator containing two relays with one normally closed and one normally open contacts, two capacitors, variable resistor, one winding lead of each relay and one of the plates of each capacitor connected to a common wire, the second winding lead of each relay through a normally closed contact connected to the second plate of the corresponding capacitor, the normally open terminals of the two contacts of both relays are combined and connected to the power bus, I differ from the fact that, in order to expand, they are functional x capabilities, two diodes are inserted into it, and their cathodes are combined and connected to one output of a variable resistor, the second output of which is connected to the common bus, and the anodes of the diodes are connected to the second terminals of the windings and normally closed relay contacts. Sources of information, taken into account in the examination 1. The author's certificate of the USSR No. 610288, cl. H 03 K 3/28, 03.02L8. 2. Radio, 1970, No. 8, p. 60 (prototype).