CN104330152A - Buzzer sound testing circuit - Google Patents
Buzzer sound testing circuit Download PDFInfo
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- CN104330152A CN104330152A CN201410685575.1A CN201410685575A CN104330152A CN 104330152 A CN104330152 A CN 104330152A CN 201410685575 A CN201410685575 A CN 201410685575A CN 104330152 A CN104330152 A CN 104330152A
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Abstract
The invention provides a buzzer sound testing circuit. The buzzer sound testing circuit comprises a voltage transformation and rectification circuit, a sampling and amplifying circuit, a controller and a buzzer alarm circuit. A power source end is connected with a power source input end of the voltage transformation and rectification circuit; the output end of the voltage transformation and rectification circuit is connected with a power source input end of the sampling and amplifying circuit; a signal input end of the sampling and amplifying circuit is connected with a microphone; a signal output end of the sampling and amplifying circuit is connected with a sampling and amplifying signal input end of the controller; a signal output end of the controller is connected with the buzzer alarm circuit.
Description
Technical field
The present invention relates to electronic circuit field, particularly relate to a kind of hummer sound test circuit.
Background technology
In making automobile instrument process; need to carry out hummer inspection to automobile instrument; in prior art, hummer pick-up unit detection signal is unstable; sound feedback is unintelligible; unstable for existing testing circuit power voltage supply; do not have protection circuit to protect testing circuit simultaneously, need those skilled in the art badly and solve the problems of the technologies described above yet.
Summary of the invention
The present invention is intended at least solve the technical matters existed in prior art, especially innovatively proposes a kind of hummer sound test circuit.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of hummer sound test circuit, its key is, comprising: Transformer Rectifier circuit, amplifier circuit, controller, buzzer alarm circuit,
Power end connects Transformer Rectifier circuit power input end, described Transformer Rectifier circuit power output terminal connects amplifier circuit power input end, described amplifier circuit signal input connects microphone, described amplifier circuit signal output terminal connection control device amplifier signal input part, described controller signals output terminal connects buzzer alarm circuit.
The beneficial effect of technique scheme is: connect work each other by Transformer Rectifier circuit, amplifier circuit, controller, buzzer alarm circuit etc., realize the work of hummer sound test, ensure that the automobile instrument hummer produced can find corresponding hummer working condition in quality testing, tell non-defective unit and substandard products, thus remove manual testing from, efficiently facilitate.
Described hummer sound test circuit, preferably, also comprises protection filtering circuit, and described Transformer Rectifier circuit power output terminal also connects protection filtering circuit input end, described protection filtering circuit output terminal connection control device power input.
Described hummer sound test circuit, preferably, described protection filtering circuit comprises: the 25 electric capacity, the 26 electric capacity, the 27 electric capacity, the first voltage stabilizing diode, the second voltage stabilizing diode,
After described 25 electric capacity, the 26 electric capacity, the 27 Capacitance parallel connection, one end connects Transformer Rectifier circuit power output terminal, other end ground connection after described 25 electric capacity, the 26 electric capacity, the 27 Capacitance parallel connection, first voltage stabilizing diode connection control device first power input, described second voltage stabilizing diode connection control device second source input end.
The beneficial effect of technique scheme is: carry out protective effect by protection filtering circuit to hummer sound test circuit.
Described hummer sound test circuit, preferably, also comprises display circuit, and described display circuit connection control device power supply signal output terminal, described display circuit is for showing hummer sound test circuit operating voltage.
Described hummer sound test circuit, preferably, described display circuit comprises: light emitting diode, the first resistance, rectifier,
Described light emitting diode positive pole connection control device voltage signal output end, described light emitting diode negative pole connects rectifier one end and first resistance one end respectively, described first resistance other end ground connection.
The beneficial effect of technique scheme is: display circuit display operating voltage normally works, if abnormal light emitting diode can not circuit.
Described hummer sound test circuit, preferably, described Transformer Rectifier circuit comprises: the first voltage stabilizer, the second voltage stabilizer, the 3rd voltage stabilizer, the first diode, the second diode, the 3rd diode, the 4th diode, the second resistance, the 3rd resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity
First diode cathode connects the 3rd diode cathode and the first power input respectively, second diode cathode connects the 4th diode cathode and second source input end respectively, be connected with second resistance one end after described first diode cathode is connected with the second diode cathode, described second resistance one end also connects the first voltage stabilizer power input, described 3rd electric capacity is connected the first voltage stabilizer power input with one end after the 4th Capacitance parallel connection, other end ground connection after described 3rd electric capacity and the 4th Capacitance parallel connection, described 5th electric capacity is connected the first voltage stabilizer power output end with one end after the 6th Capacitance parallel connection, other end ground connection after described 5th electric capacity and the 6th Capacitance parallel connection,
The described second resistance other end connects one end after the 7th electric capacity and the 8th Capacitance parallel connection, described 7th electric capacity is also connected the second voltage stabilizer power input with one end after the 8th Capacitance parallel connection, other end ground connection after described 7th electric capacity and the 8th Capacitance parallel connection, described 9th electric capacity is connected the second voltage stabilizer power output end with one end after the tenth Capacitance parallel connection, other end ground connection after described 9th electric capacity and the tenth Capacitance parallel connection;
Be connected with the 3rd resistance one end after described 3rd diode cathode is connected with the 4th diode cathode, the described 3rd resistance other end connects one end after the 12 electric capacity and the 13 Capacitance parallel connection, described 12 electric capacity is also connected the 3rd voltage stabilizer power input with one end after the 13 Capacitance parallel connection, other end ground connection after described 12 electric capacity and the 13 Capacitance parallel connection, described 14 electric capacity is connected the 3rd voltage stabilizer power output end with one end after the 15 Capacitance parallel connection, other end ground connection after described 14 electric capacity and the 15 Capacitance parallel connection.
The beneficial effect of technique scheme is: carry out Transformer Rectifier by the voltage of Transformer Rectifier circuit to the power circuit of input, make the voltage of output more stable, ensure the normal work of sound test circuit, extend the serviceable life of sound test circuit.
Described hummer sound test circuit, preferably, described amplifier circuit comprises: the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 16 resistance, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity, the 20 electric capacity, first amplifier, the second amplifier
Microphone output terminal connects the 6th resistance one end and the 11 resistance one end, the described 6th resistance other end connects Transformer Rectifier circuit power output terminal, described 11 resistance other end ground connection, described 16 electric capacity one end connects the 6th resistance one end, the described 16 electric capacity other end connects the 8th resistance one end, the described 8th resistance other end connects the first amplifier negative input, described first amplifier anode input end connects the 13 resistance one end, described 13 resistance other end ground connection, described first amplifier negative input also connects the 4th resistance one end, the described 4th resistance other end connects the first amplifier out, described first amplifier out also connects the 17 electric capacity one end,
The described 17 electric capacity other end connects the 7th resistance one end and the 12 resistance one end, the described 7th resistance other end connects Transformer Rectifier circuit power output terminal, described 12 resistance other end ground connection, described 18 electric capacity one end connects the 7th resistance one end, the described 18 electric capacity other end connects the tenth resistance one end, the described tenth resistance other end connects the second amplifier negative input, described second amplifier anode input end connects the 16 resistance one end, described 16 resistance other end ground connection, described 5th resistance one end connects the second amplifier negative input, the described 5th resistance other end connects the second amplifier out, described second amplifier out also connects the 20 electric capacity one end, described 20 electric capacity other end connection control device signal input part, the described 20 electric capacity other end also connects the 9th resistance one end and the 14 resistance one end respectively, the described 9th resistance other end connects Transformer Rectifier circuit power output terminal, described 14 resistance other end ground connection.
The beneficial effect of technique scheme is: carry out better sound test by amplifier circuit to hummer sound test circuit, ensures the stability of operating circuit.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
Work is connected each other by Transformer Rectifier circuit, amplifier circuit, controller, buzzer alarm circuit etc., realize the work of hummer sound test, ensure that the automobile instrument hummer produced can find corresponding hummer working condition in quality testing, tell non-defective unit and substandard products, thus remove manual testing from, efficiently facilitate.
By protection filtering circuit, protective effect is carried out to hummer sound test circuit.
Display circuit display operating voltage normally works, if abnormal light emitting diode can not circuit.
Carry out Transformer Rectifier by the voltage of Transformer Rectifier circuit to the power circuit of input, make the voltage of output more stable, ensure the normal work of sound test circuit, extend the serviceable life of sound test circuit.
By amplifier circuit, better sound test is carried out to hummer sound test circuit, ensure the stability of operating circuit.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is hummer sound test circuit connection diagram of the present invention;
Fig. 2 is hummer sound test circuit Transformer Rectifier circuit diagram of the present invention;
Fig. 3 is hummer sound test circuit hummer operating circuit schematic diagram of the present invention;
Fig. 4 is hummer sound test circuit Transistor-Transistor Logic level change-over circuit schematic diagram of the present invention;
Fig. 5 is hummer sound test circuit amplifier circuit diagram of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
As shown in Figure 1,3, the invention provides a kind of hummer sound test circuit, its key is, comprising: Transformer Rectifier circuit, amplifier circuit, controller, buzzer alarm circuit,
Power end connects Transformer Rectifier circuit power input end, described Transformer Rectifier circuit power output terminal connects amplifier circuit power input end, described amplifier circuit signal input connects microphone, described amplifier circuit signal output terminal connection control device amplifier signal input part, described controller signals output terminal connects buzzer alarm circuit.
The beneficial effect of technique scheme is: connect work each other by Transformer Rectifier circuit, amplifier circuit, controller, buzzer alarm circuit etc., realize the work of hummer sound test, ensure that the automobile instrument hummer produced can find corresponding hummer working condition in quality testing, tell non-defective unit and substandard products, thus remove manual testing from, efficiently facilitate.
Described hummer sound test circuit, preferably, also comprises protection filtering circuit, and described Transformer Rectifier circuit power output terminal also connects protection filtering circuit input end, described protection filtering circuit output terminal connection control device power input.
Described hummer sound test circuit, preferably, described protection filtering circuit comprises: the 25 electric capacity, the 26 electric capacity, the 27 electric capacity, the first voltage stabilizing diode (DZ1), the second voltage stabilizing diode (DZ2),
After described 25 electric capacity, the 26 electric capacity, the 27 Capacitance parallel connection, one end connects Transformer Rectifier circuit power output terminal, other end ground connection after described 25 electric capacity, the 26 electric capacity, the 27 Capacitance parallel connection, first voltage stabilizing diode connection control device first power input, described second voltage stabilizing diode connection control device second source input end.
The beneficial effect of technique scheme is: carry out protective effect by protection filtering circuit to hummer sound test circuit.
Described hummer sound test circuit, preferably, also comprises display circuit, and described display circuit connection control device power supply signal output terminal, described display circuit is for showing hummer sound test circuit operating voltage.
Described hummer sound test circuit, preferably, described display circuit comprises: light emitting diode, the first resistance, rectifier,
Described light emitting diode positive pole connection control device voltage signal output end, described light emitting diode negative pole connects rectifier one end and first resistance one end respectively, described first resistance other end ground connection.
The beneficial effect of technique scheme is: display circuit display operating voltage normally works, if abnormal light emitting diode can not circuit.
As shown in Figure 2, described hummer sound test circuit, preferably, described Transformer Rectifier circuit comprises: the first voltage stabilizer, the second voltage stabilizer, the 3rd voltage stabilizer, the first diode, the second diode, the 3rd diode, the 4th diode, the second resistance, the 3rd resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity
First diode cathode connects the 3rd diode cathode and the first power input respectively, second diode cathode connects the 4th diode cathode and second source input end respectively, be connected with second resistance one end after described first diode cathode is connected with the second diode cathode, described second resistance one end also connects the first voltage stabilizer power input, described 3rd electric capacity is connected the first voltage stabilizer power input with one end after the 4th Capacitance parallel connection, other end ground connection after described 3rd electric capacity and the 4th Capacitance parallel connection, described 5th electric capacity is connected the first voltage stabilizer power output end with one end after the 6th Capacitance parallel connection, other end ground connection after described 5th electric capacity and the 6th Capacitance parallel connection,
The described second resistance other end connects one end after the 7th electric capacity and the 8th Capacitance parallel connection, described 7th electric capacity is also connected the second voltage stabilizer power input with one end after the 8th Capacitance parallel connection, other end ground connection after described 7th electric capacity and the 8th Capacitance parallel connection, described 9th electric capacity is connected the second voltage stabilizer power output end with one end after the tenth Capacitance parallel connection, other end ground connection after described 9th electric capacity and the tenth Capacitance parallel connection;
Be connected with the 3rd resistance one end after described 3rd diode cathode is connected with the 4th diode cathode, the described 3rd resistance other end connects one end after the 12 electric capacity and the 13 Capacitance parallel connection, described 12 electric capacity is also connected the 3rd voltage stabilizer power input with one end after the 13 Capacitance parallel connection, other end ground connection after described 12 electric capacity and the 13 Capacitance parallel connection, described 14 electric capacity is connected the 3rd voltage stabilizer power output end with one end after the 15 Capacitance parallel connection, other end ground connection after described 14 electric capacity and the 15 Capacitance parallel connection.
The beneficial effect of technique scheme is: carry out Transformer Rectifier by the voltage of Transformer Rectifier circuit to the power circuit of input, make the voltage of output more stable, ensure the normal work of sound test circuit, extend the serviceable life of sound test circuit.
As shown in Figure 5, described hummer sound test circuit, preferably, described amplifier circuit comprises: the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 16 resistance, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity, the 20 electric capacity, first amplifier, the second amplifier
Microphone output terminal connects the 6th resistance one end and the 11 resistance one end, the described 6th resistance other end connects Transformer Rectifier circuit power output terminal, described 11 resistance other end ground connection, described 16 electric capacity one end connects the 6th resistance one end, the described 16 electric capacity other end connects the 8th resistance one end, the described 8th resistance other end connects the first amplifier negative input, described first amplifier anode input end connects the 13 resistance one end, described 13 resistance other end ground connection, described first amplifier negative input also connects the 4th resistance one end, the described 4th resistance other end connects the first amplifier out, described first amplifier out also connects the 17 electric capacity one end,
The described 17 electric capacity other end connects the 7th resistance one end and the 12 resistance one end, the described 7th resistance other end connects Transformer Rectifier circuit power output terminal, described 12 resistance other end ground connection, described 18 electric capacity one end connects the 7th resistance one end, the described 18 electric capacity other end connects the tenth resistance one end, the described tenth resistance other end connects the second amplifier negative input, described second amplifier anode input end connects the 16 resistance one end, described 16 resistance other end ground connection, described 5th resistance one end connects the second amplifier negative input, the described 5th resistance other end connects the second amplifier out, described second amplifier out also connects the 20 electric capacity one end, described 20 electric capacity other end connection control device signal input part, the described 20 electric capacity other end also connects the 9th resistance one end and the 14 resistance one end respectively, the described 9th resistance other end connects Transformer Rectifier circuit power output terminal, described 14 resistance other end ground connection.
The beneficial effect of technique scheme is: carry out better sound test by amplifier circuit to hummer sound test circuit, ensures the stability of operating circuit.
Described first amplifier and the second amplifier are LM358;
As shown in Figure 4, Transistor-Transistor Logic level change-over circuit one end connects Transformer Rectifier circuit, and the shown Transistor-Transistor Logic level change-over circuit other end connects connection control device input end, and controller is connected by serial ports with Transistor-Transistor Logic level change-over circuit, and described Transistor-Transistor Logic level change-over circuit is 74HC14D.
The first voltage stabilizer in described Transformer Rectifier circuit is the 7812, second voltage stabilizer be the 7805, three voltage stabilizer is 7905.
Described controller is preferably NUC120.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (7)
1. a hummer sound test circuit, is characterized in that, comprising: Transformer Rectifier circuit, amplifier circuit, controller, buzzer alarm circuit,
Power end connects Transformer Rectifier circuit power input end, described Transformer Rectifier circuit power output terminal connects amplifier circuit power input end, described amplifier circuit signal input connects microphone, described amplifier circuit signal output terminal connection control device amplifier signal input part, described controller signals output terminal connects buzzer alarm circuit.
2. hummer sound test circuit according to claim 1; it is characterized in that; also comprise protection filtering circuit, described Transformer Rectifier circuit power output terminal also connects protection filtering circuit input end, described protection filtering circuit output terminal connection control device power input.
3. hummer sound test circuit according to claim 1; it is characterized in that; described protection filtering circuit comprises: the 25 electric capacity, the 26 electric capacity, the 27 electric capacity, the first voltage stabilizing diode (DZ1), the second voltage stabilizing diode (DZ2)
After described 25 electric capacity, the 26 electric capacity, the 27 Capacitance parallel connection, one end connects Transformer Rectifier circuit power output terminal, other end ground connection after described 25 electric capacity, the 26 electric capacity, the 27 Capacitance parallel connection, first voltage stabilizing diode connection control device first power input, described second voltage stabilizing diode connection control device second source input end.
4. hummer sound test circuit according to claim 1, is characterized in that, also comprise display circuit, and described display circuit connection control device power supply signal output terminal, described display circuit is for showing hummer sound test circuit operating voltage.
5. hummer sound test circuit according to claim 1, it is characterized in that, described display circuit comprises: light emitting diode, the first resistance, rectifier,
Described light emitting diode positive pole connection control device voltage signal output end, described light emitting diode negative pole connects rectifier one end and first resistance one end respectively, described first resistance other end ground connection.
6. hummer sound test circuit according to claim 1, it is characterized in that, described Transformer Rectifier circuit comprises: the first voltage stabilizer, the second voltage stabilizer, the 3rd voltage stabilizer, the first diode, the second diode, the 3rd diode, the 4th diode, the second resistance, the 3rd resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity
First diode cathode connects the 3rd diode cathode and the first power input respectively, second diode cathode connects the 4th diode cathode and second source input end respectively, be connected with second resistance one end after described first diode cathode is connected with the second diode cathode, described second resistance one end also connects the first voltage stabilizer power input, described 3rd electric capacity is connected the first voltage stabilizer power input with one end after the 4th Capacitance parallel connection, other end ground connection after described 3rd electric capacity and the 4th Capacitance parallel connection, described 5th electric capacity is connected the first voltage stabilizer power output end with one end after the 6th Capacitance parallel connection, other end ground connection after described 5th electric capacity and the 6th Capacitance parallel connection,
The described second resistance other end connects one end after the 7th electric capacity and the 8th Capacitance parallel connection, described 7th electric capacity is also connected the second voltage stabilizer power input with one end after the 8th Capacitance parallel connection, other end ground connection after described 7th electric capacity and the 8th Capacitance parallel connection, described 9th electric capacity is connected the second voltage stabilizer power output end with one end after the tenth Capacitance parallel connection, other end ground connection after described 9th electric capacity and the tenth Capacitance parallel connection;
Be connected with the 3rd resistance one end after described 3rd diode cathode is connected with the 4th diode cathode, the described 3rd resistance other end connects one end after the 12 electric capacity and the 13 Capacitance parallel connection, described 12 electric capacity is also connected the 3rd voltage stabilizer power input with one end after the 13 Capacitance parallel connection, other end ground connection after described 12 electric capacity and the 13 Capacitance parallel connection, described 14 electric capacity is connected the 3rd voltage stabilizer power output end with one end after the 15 Capacitance parallel connection, other end ground connection after described 14 electric capacity and the 15 Capacitance parallel connection.
7. hummer sound test circuit according to claim 1, it is characterized in that, described amplifier circuit comprises: the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 16 resistance, the 16 electric capacity, the 17 electric capacity, the 18 electric capacity, the 20 electric capacity, first amplifier, the second amplifier
Microphone output terminal connects the 6th resistance one end and the 11 resistance one end, the described 6th resistance other end connects Transformer Rectifier circuit power output terminal, described 11 resistance other end ground connection, described 16 electric capacity one end connects the 6th resistance one end, the described 16 electric capacity other end connects the 8th resistance one end, the described 8th resistance other end connects the first amplifier negative input, described first amplifier anode input end connects the 13 resistance one end, described 13 resistance other end ground connection, described first amplifier negative input also connects the 4th resistance one end, the described 4th resistance other end connects the first amplifier out, described first amplifier out also connects the 17 electric capacity one end,
The described 17 electric capacity other end connects the 7th resistance one end and the 12 resistance one end, the described 7th resistance other end connects Transformer Rectifier circuit power output terminal, described 12 resistance other end ground connection, described 18 electric capacity one end connects the 7th resistance one end, the described 18 electric capacity other end connects the tenth resistance one end, the described tenth resistance other end connects the second amplifier negative input, described second amplifier anode input end connects the 16 resistance one end, described 16 resistance other end ground connection, described 5th resistance one end connects the second amplifier negative input, the described 5th resistance other end connects the second amplifier out, described second amplifier out also connects the 20 electric capacity one end, described 20 electric capacity other end connection control device signal input part, the described 20 electric capacity other end also connects the 9th resistance one end and the 14 resistance one end respectively, the described 9th resistance other end connects Transformer Rectifier circuit power output terminal, described 14 resistance other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410685575.1A CN104330152A (en) | 2014-11-25 | 2014-11-25 | Buzzer sound testing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410685575.1A CN104330152A (en) | 2014-11-25 | 2014-11-25 | Buzzer sound testing circuit |
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| CN104330152A true CN104330152A (en) | 2015-02-04 |
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| CN201410685575.1A Pending CN104330152A (en) | 2014-11-25 | 2014-11-25 | Buzzer sound testing circuit |
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| CN108931293A (en) * | 2018-10-08 | 2018-12-04 | 伟创力电子技术(苏州)有限公司 | A kind of method and sensor of on-line testing buzzer |
| CN109061373A (en) * | 2018-09-28 | 2018-12-21 | 中国船舶重工集团公司第七0七研究所九江分部 | A kind of short-circuit automatic detection circuit device of four terminal potential device signals broken string |
| CN110636430A (en) * | 2019-08-10 | 2019-12-31 | 中山华帝电子科技有限公司 | Anti-interference buzzer test system |
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| CN110636430A (en) * | 2019-08-10 | 2019-12-31 | 中山华帝电子科技有限公司 | Anti-interference buzzer test system |
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Application publication date: 20150204 |