SU783876A1 - Device for multi-digit push-button change-over switch - Google Patents

Description

(54) DEVICE FOR VARIABLE BUTTON SWITCHING

I. .

The invention relates to devices dp of a multi-digit push-button intercept with an electronic fixation of the Tobima bit of the pressed button and the general states of the bits of the rest of the button.

A device is known for many; it is a horn of a large cross section of 17K5cheny, jiHonKH, which stores epemenNty with separate; inputs (remote switches) and power supply

that

A disadvantage of this device is that it has large dimensions, complex construction and low reliability due to the large number of diodes in the matrix (7 n, where P is the number of switch bits), especially with a large number of bits.

Of the known devices, the closest to the invention in terms of technical means and the attainable | result is a device for multi-digit button switching, containing

BUTTONS, memorizing elements with separate inputs (remote switches) and a power source, the negative adhesive of which is connected to the primary contacts of the buttons, and the second contacts connected to the installation inputs of the corresponding MSSTOB 2.

The disadvantage of this device is that it, due to the presence of distance switches as storage elements, has low reliability and large dimensions, and also requires the use of 1 & switching buttons and power supply,

15 designed for impulse loading.

The aim of the invention is to reduce the size and simplify the contact system of the buttons used.

The goal is achieved by

20 that a sophisticated device for multi-digit push-button switching. Equipped with AND-NOT elements, delay units, NOT-OR elements and ballast

some resistors, connected by some leads to the source power supply, and others to the second contacts of the buttons and the inputs of the NOT-OR element, as well as through the delay links to the first inputs of the corresponding IT-elements AND-NOT, the second inputs of the terminals with and NB-OR element, and the outputs - with the reset inputs of e-memo-charging elements, the outputs of which are connected to the output terminals of the device, moreover, the auxiliary interfaces are made on triggers.

The drawing is a diagram of the device.

The device consists of short-circuit buttons 1, storage elements 2 with separate inputs (flip-flops), 3 AND-NO elements, 4 delay links (for example, each of two consecutively connected rwvertors), element 5 NOT-OR and ballast resistors b . .

The device works as follows.

When one of the buttons 1 is pressed, its contacts are closed and the low voltage level from the negative terminal of the power source is applied to the input of the trigger 2 installation of the corresponding device bit, including it, and also through the delay 4 link to the input of the element 3 of the corresponding bit , impeding the passage of the signal zero.

Since the remaining buttons 1 are not pressed at this moment, a high voltage level is applied to the first inputs of the 3 AND-NAND elements of the remaining device bits through the ballast resistors 6 and the delay level 4, allowing the zero signal to flow.

In addition, the low voltage level from the contact of the pressed button 1 is fed to the corresponding input of element 5 HB-OR by forming at its input a zero signal in the form of a high voltage level, which is fed to the other inputs by element 3 AND-NOT.

Since the inputs of the elements 3 AND-NOT of all the bits of the device, except for the discharge with the button pressed, are given permitting signals, the zero signal

elements 3 AND-NOT passes and resets the previous states of triggers 2 in these bits.

When releasing the pressed button 1, the zeroing signal does not output the corresponding trigger 2 is absent and it remains in the on state because, due to link 4 of the delay, the inhibit signal in the form of a low voltage level from the output of element 5 NOR arrives at the input of element 3 AND-NOT earlier than its other input receives a resolution signal in the form of a high voltage level.

Claims (2)

1. A device for multi-bit button switching, comprising buttons, memory elements with separate inputs and a power source, the negative terminal of which is connected with the first contacts of the buttons, and the second contacts are connected to the installation inputs of the corresponding storage elements, characterized in that it is equipped with AND-NOT elements, delay links, NOT-OR elements, and a circuit for reducing the size and simplification of the contact system of the buttons used. by ballast resistors connected by one pins to the positive terminal of the power source, and others to the second contacts of the buttons and inputs of the NOT-OR element, as well as through the delay links to the first inputs of the corresponding NAND elements, the second input which is connected to the output of the NOR, and outputs - to the inputs of the reset storage elements, the outputs of which are connected to output terminals Arrange Twa. 2. The device according to claim 1, stating that the memory elements are made on triggers. Sources of information, taken into account during the examination 1.Authorial USSR No. 349038, cl. H 01 H 13/76, 1972. 2. USSR author's certificate number 455387, cl. H O1 H 13/74, 1974 (prototype).