Buzzer testing circuit
A technology for testing circuits and buzzers, which is applied to instruments, measuring vibrations, and measuring devices. It can solve problems such as mishearing, wrong test results, and inaudible sound quality by inspectors, and achieve the effect of improving the quality of testing.
Inactive Publication Date: 2014-01-15
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
[0002] There are usually built-in or external sound-generating devices such as speakers and buzzers on the motherboard. In the process of sound testing the sound-generating devices of the motherboard, the existing method is to rely on the testing personnel to test by listening. It is easy to cause human error, such as the tester misheard, could not hear clearly, could not hear the sound quality, etc., resulting in wrong test results
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[0019] Please refer to figure 1 , the buzzer test circuit of the present invention is used for testing whether a buzzer 20 is qualified, and the preferred embodiment of this buzzer test circuit comprises a microphone 10, an amplifying circuit 30, a gain circuit 40, a microprocessor circuit 50 , an interface circuit 90 and a display circuit 100 .
[0020] Please refer to figure 2 , the microphone 10 is used to receive the sound wave signal emitted by playing a specific file through the buzzer 20, and output a corresponding analog signal, wherein the negative pole of the microphone 10 is grounded, and the positive pole outputs an analog signal.
[0021] The amplifying circuit 30 is used for amplifying the analog signal output by the microphone 10 . The amplifying circuit 30 includes two amplifiers U1 and U2, ten resistors R1-R9 and R20, and five capacitors C1-C5. The inverting input terminal of the amplifier U1 is connected to a power supply VDD through the resistor R3, and ...
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A buzzer testing circuit comprises a microphone, an amplifying circuit, a microprocessor circuit and a display circuit. The microphone is used for receiving an acoustic signal sent out by a buzzer and generating a corresponding analog signal; the amplifying circuit is used for outputting an amplified signal corresponding to the analog signal; the microprocessor circuit comprises a microprocessor which is used for carrying out analog-to-digital conversion on the amplified signal output by the amplifying circuit to obtain a loudness corresponding to the amplified signal and used for sampling the amplified signal output by the amplifying circuit to obtain a frequency corresponding to the amplified signal; and the display circuit is used for displaying information such as the loudness and the frequency. The buzzer testing circuit of the invention can automatically test an acoustic signal sent out by the buzzer so as to avoid human errors, reduce the probability of error test in production line test and improve the quality of testing.
Description
technical field [0001] The invention relates to a test circuit, in particular to a buzzer test circuit. Background technique [0002] There are usually built-in or external sound-generating devices such as speakers and buzzers on the motherboard. In the process of sound testing the sound-generating devices of the motherboard, the existing method is to rely on the testing personnel to test by listening. It is easy to produce human errors, such as the testing personnel misheard, could not hear clearly, could not hear the sound quality and other problems, resulting in wrong test results. Therefore, there is a need for a test circuit that can avoid human error in the sound test of the host, reduce the probability of false detection in the production line test, and improve the quality of the test. Contents of the invention [0003] In view of the above, it is necessary to provide a buzzer test circuit that can improve the accuracy of the motherboard sound test. [0004] A buz...
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IPC IPC(8): G01H17/00
CPCG01H3/06G01H3/12H04R29/008
Inventor 肖贵富尹晓钢张万宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD