SU1619426A1 - Device for determining polarity of speaker terminals - Google Patents

Abstract

The invention relates to electroacoustic measurements. The purpose of the invention is to increase the speed and reliability of determining the polarity of the loudspeaker terminals. When a current pulse is applied to the loudspeaker 2, the conductive membrane 3 closes one of the contacts 4 or 5j, depending on the phasing of the loudspeaker. 1 il.

Description

The invention relates to electro-acoustic measurements. The purpose of the invention is to increase the speed and reliability of determining the polarity of the conclusions of the speakers. When a current pulse is applied to the loudspeaker 2, a flexible conductive membrane 3 closes one of the contacts 4 or 5ι depending on the phasing of the loudspeaker. 1 ill.

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The invention relates to electrical engineering, more specifically to electro-acoustic measurements, is intended to determine the polarity of the conclusions of the speakers. and can be used in mass production, for example, in the radio industry.

The purpose of the invention is to increase the speed and reliability of determining the polarity of the conclusions.

The drawing shows a functional block diagram of a device for determining the polarity of the conclusions of the speaker. units

The device contains a direct current source 1, the general output of which is connected to one terminal of the loudspeaker 2 and a conductive elastic membrane 3 installed in front of the thunder-speaker 2, the first 4 and second 5 contacts form normally open contacts with the membrane 3, and the second output of the loudspeaker 2 through shaper 6 single pulse. 25 is connected to the positive terminal of the DC source 1 and the first terminals of the first 7 and second 8 resistors, the second terminals of which are connected to the first inputs of the first 9 and second 10 OR elements and, respectively, to the first 4 and second 5 contacts via conductive buses 11 and 12, outputs the first 9 and second 10 elements of the ILD are connected to 8 inputs of the first 13 and second 14 triggers, respectively, the p-outputs of which are connected respectively to the first 15 and second 16 display elements, the second input of the first element OR 9 is connected. is dined with the (^ -output of the second trigger 14, and the second input of the second OR element 10. connected to the 0-output of the first trigger 13, the output of the unit 17 is connected to the K-inputs of the first 13 and second 14 triggers.

The screws of contacts 4 and 5 are adjusted so that they have a minimum distance on both sides of the membrane 3 and do not touch it in a static state. Contacts 4 and 5 are installed on the conductive tires 11 and 12 ,. which must be narrow enough to ,, sound pressure pulse from the loudspeaker cone was given ¹ 2 transferred on the elastic membrane 3. The monostable multivibrator may be used or any other device as a single pulse generator 6,

forming one current pulse at the terminals of loudspeaker 2, in its simplest form it can be a button without fixing. All electronic units and elements are powered by a direct current source 1, these power circuits. blocks and elements are not shown in the diagram.

The device operates as follows.

At the time of supply of the supply voltage, the installation unit 17 generates a pulse that transfers the triggers 13 and 14 to the initial state, while the LEDs (not shown) of the elements 15 and 16 are off and the whole device is ready for operation. At the p-outputs of triggers 13 and 14 and, respectively, at the second inputs of the OR elements 9 and 10 there is a logical "0", and at the first inputs and outputs of these elements there is a logical "1". At the moment a pulse arrives at the conclusions of loudspeaker 2 from block 6, the diffuser creates sound pressure in the form of a pulse and deflects the membrane 3 in one or the other direction, depending on the polarity of the conclusions of loudspeaker 2. Suppose that the membrane 3 is closed with the screw of contact 4, while on the first output OR 9 element displays a logical “O”, which coincides with a logical “0” at the second input, as a result of the output of an OR 9 element a logical “0” appears, which overturns trigger 13 to another stable state. On the C) output of the trigger thirteen a logical "0" appears, which turns on the LED of the element '

15 of the indication, and at the (^ -output - logical ”1”, which closes the OR element 10 at the second input. At the same time, the logic “0” goes through to the output of the OR element 10. And the second trigger 14 is turned over, even if the membrane 3 closes with contact 5 when the diffuser returns to its original state after the end of the current pulse at the output of a single pulse shaper 6. The time for the prohibition on the second element OR 10 is always equal to the time) switching trigger 13 for TTL ^! This time does not exceed 50 ns of microcircuits, which ensures high noise immunity and reliability of the device. in operation even at the highest frequency of the highest frequency loud5

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unit 2 when determining the polarity of the conclusions.

The single-pulse generator 6 generates a unipolar pulse, the duration of which is approximately equal to the half-period of the resonance frequency of the tested speaker 2, which reduces the current consumption of the speaker 2 from source 1 to a minimum, eliminates the current overload of the speaker and ensures high reliability of the device. So, at a resonance frequency of 100 Hz, the pulse duration 15 at the output of the shaper 6 can be equal to 5 ms, which determines the speed of the device.

Information on the polarity of the terminals of loudspeaker 2 is stored for an unlimited time and is reset using the “Reset” button (not shown) located in the unit 17 of the installation.

The second half of the device circuit works in a similar way for 25 cases of a different polarity of the conclusions of the loudspeaker 2 and the closure of the membrane 3 with pin 5.

Claims (1)

Claim thirty A device for determining the polarity of the loudspeaker pins, containing a ring of dielectric material in which the conductive membrane is fixed, a DC source, the common terminal of which ^ 5 is connected to one terminal for connecting the loudspeaker and conductive membrane, the second terminal for connecting the loudspeaker and the first contact that is different the fact that, in order to increase the speed and reliability of determining the polarity of the conclusions, the installation unit, the first and second elements OR, the first and second tons Iggers, first and second display elements, first and second resistors, a single pulse shaper and a second contact, the first and second contacts forming normally open contacts with a membrane, the second terminal for connecting a loudspeaker through a single pulse shaper and , the first pins of the first and second resistors, the second pins of which are connected to the first inputs of the first and second elements of OR and correspondingly with the first and second contacts mi, the outputs of the first and second elements OR are connected to the δ inputs of the first and second triggers, respectively, the 0 outputs of which are connected respectively to the first and second elements of the display, the second input of the first OR element is connected to the 0 input of the second trigger OR is connected to the 0-output of the first trigger, the output of the installation unit is connected to the K-inputs of the first and second triggers. ι