CN108806658A - A kind of blood analyser and its buzzer volume adjust driving circuit - Google Patents
A kind of blood analyser and its buzzer volume adjust driving circuit Download PDFInfo
- Publication number
- CN108806658A CN108806658A CN201710317230.4A CN201710317230A CN108806658A CN 108806658 A CN108806658 A CN 108806658A CN 201710317230 A CN201710317230 A CN 201710317230A CN 108806658 A CN108806658 A CN 108806658A
- Authority
- CN
- China
- Prior art keywords
- buzzer
- triode
- volume
- pwm
- driving units
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 210000004369 blood Anatomy 0.000 title claims abstract description 20
- 239000008280 blood Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 abstract description 6
- 210000000601 blood cell Anatomy 0.000 description 8
- 230000008859 change Effects 0.000 description 8
- 230000001174 ascending effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- External Artificial Organs (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of blood analysers and its buzzer volume to adjust driving circuit, it includes control unit, PWM driving units, sound volume regulation unit and buzzer, described control unit control connection PWM driving units and sound volume regulation unit, the PWM driving units and sound volume regulation unit are electrically connected buzzer；Described control unit exports two groups of control signals：One group of control signal is for controlling PWM driving units, and when it is high level or low level to control signal, PWM driving units export PWM waveform and drive buzzer call；Another group of control signal is for controlling sound volume regulation unit, and when needing to adjust the volume of buzzer, sound volume regulation unit exports the signal of different intensity, and buzzer sends out the volume of varying strength according to the signal strength that sound volume regulation unit exports.Using escapable cost of the present invention, and circuit is simple and reliable, can at any time be adjusted according to actual environment, adjusting method is simple and effective.
Description
Technical field
The present invention relates to a kind of blood analyser more particularly to a kind of blood analysers and its buzzer volume to adjust
Driving circuit.
Background technology
Accurate that product, especially medicinal is examined to examine equipment blood cell analyzer, testing result is to instrument
The dependence of state is very strong, needs to be monitored the state of instrument.Therefore it needs to increase buzzer, when instrument state occurs
When abnormal, user, the debugging of inspection apparatus state are reminded in time.Due to examining class equipment especially blood cell analyzer equal
It is to be used in hospital inspection section office, when blood cell analyzer breaks down Shi doctor not beside blood cell analyzer, needs
Want the sound of buzzer sufficiently large, to remind doctor；When blood cell analyzer breaks down Shi doctor just in blood cell point
Operating instrument beside analyzer, needs the sound of buzzer sufficiently small, can remind doctor.In addition, when hospital laboratory is set
It is standby more, when environment is noisy, need the sound of buzzer sufficiently large；When hospital laboratory environment quiet (such as on night duty), need
Want buzzer sound sufficiently small.Therefore doctor needs, according to different environment, the volume of buzzer to be adjusted, to meet not
With the use demand under environment.
More than current blood cell analysis, most of is all to use active buzzer, its main feature is that driving circuit is simple
It is single, it can work to a voltage, the disadvantage is that volume is constant, it is not possible to adjust.Want to realize that the volume of buzzer is adjustable, only
Passive buzzer can be used, its main feature is that driving circuit is complicated, the sound that pipes is adjustable.Passive buzzer on the market needs at present
The PWM wave of control device output certain frequency is driven.
The prior art：104916277 A of Chinese patent CN, a kind of adjustable sourceless electromagnetic type buzzer driving electricity of volume
Road and its method invent a kind of adjustable driving method of the volume of passive buzzer.The patent mainly relies on the ends MCU device PWM
Mouthful buzzer is driven, changes the driving current of buzzer using other IO control ports of MCU, to realize adjusting buzzing
The volume of device.
To sum up, the prior art, which has some limitations, specifically includes：
(1) volume of buzzer is realized by driving current, and the change of driving current is driven by changing
The current-limiting resistance of circuit is come what is realized, and so, the size of current-limiting resistance needs to set in advance, after setting, buzzing
The volume of device is also just preset, and due to default level of sound volume limited amount, user can not be according to actual experimental situation certainly
Oneself adjusts buzzer volume；
(2) multiple sound volume regulation units need to occupy MCU devices PWM control pins and multiple IO control pins, occupy
The interface resource of MCU is unfavorable for circuit and spreads；
(3) size of volume adjustment is that preset in advance is good, and level of sound volume is not continuous, but great-jump-forward.
Therefore, the existing technology needs to be improved and developed.
Invention content
The purpose of the present invention is to provide a kind of blood analysers and its buzzer volume to adjust driving circuit, it is intended to solve
The problem of buzzer volume of existing blood analyser will not automatically adjust suitable volume with environment.
Technical scheme is as follows：
A kind of buzzer volume adjusting driving circuit of blood analyser comprising control unit, PWM driving units, sound
Amount adjusts unit and buzzer, described control unit control connection PWM driving units and sound volume regulation unit, the PWM drivings
Unit and sound volume regulation unit are electrically connected buzzer；Described control unit exports two groups of control signals：One group of control signal is used for
PWM driving units are controlled, when it is high level or low level to control signal, PWM driving units export PWM waveform and drive buzzer
It pipes；Another group of control signal is for controlling sound volume regulation unit, when needing to adjust the volume of buzzer, sound volume regulation unit
The signal of different intensity is exported, buzzer sends out the volume of varying strength according to the signal strength that sound volume regulation unit exports.
The buzzer volume of the blood analyser adjusts driving circuit, wherein the PWM driving units are by three poles
The RC multi-resonant oscillating circuits or PWM waveform generation circuit, device or device can be generated that pipe is constituted.
The buzzer volume of the blood analyser adjusts driving circuit, wherein the adjusting buzzer volume is soft
Digital regulation resistance either level setting switches or the knob of part control.
The buzzer volume of the blood analyser adjusts driving circuit, wherein the PWM driving units circuit structure
For：Including the first triode and the second triode, the emitter-base bandgap grading of first triode connect and connects with the emitter-base bandgap grading of the second triode
Ground；The collector of first triode connects power supply by first resistor；The base stage of first triode passes through 3rd resistor
Connect power supply；The collector of second triode connects power supply by the 4th resistance；The base stage of second triode passes through
Two resistance connect power supply；It is provided with the first capacitance between the collector and the base stage of the second triode of first triode；Described
The second capacitance is provided between the collector of two triodes and the base stage of the first triode；The base stage of second triode passes through the 5th
Resistance connects control unit, the collector output connection buzzer circuit of second triode.
The buzzer volume of the blood analyser adjusts driving circuit, wherein the specific PWM driving units
Output end connects the base stage of the third transistor in buzzer circuit, and the emitter-base bandgap grading of the third transistor connects digital regulation resistance,
The collector of the third transistor connects buzzer.
A kind of blood analyser is provided with buzzer volume as described above and adjusts driving circuit.
Beneficial effects of the present invention：The present invention is by providing a kind of realization for the buzzer drive circuit that volume can be adjusted
Method and its application on blood cell analysis.Compared with prior art, the invention have it is following a little：
(1) the PWM drivings of buzzer are that an individual PWM driving unit generates, which is one by triode structure
At RC multi-resonant oscillating circuits, circuit is simple and reliable, at low cost；The PWM interfaces that control device need not be used, can discharge control
The resource of device processed；
(2) the PWM driving units of buzzer only need slightly to adjust resistance parameter different size both may be implemented
Passive buzzer, model applied widely；
(3) sound volume regulation unit is a device that can change buzzer electric current in real time, and unit may be implemented continuously
The volume of change buzzer can at any time be adjusted according to actual environment, adjusting method simply has without pre-setting
Effect.
Description of the drawings
Fig. 1 is driving circuit principle block diagram provided by the invention.
Fig. 2 is driving circuit embodiment circuit diagram provided by the invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.
Volume adjustment buzzer drive circuit in the present invention consists of two parts, and a part is PWM driving units, another
Part is sound volume regulation unit.Wherein the PWM driving units of passive buzzer can be electric by the RC multi-harmonic-oscillations that triode is constituted
Road provides, and the circuit design is simple, and stability at low cost is good.The realization of sound volume regulation unit includes two ways, and one is soft
Part adjusts the volume of buzzer with hardware cooperation, and another kind is the volume of independent hardware adjustments buzzer.
As shown in Figure 1, it includes control unit 101 that buzzer volume provided by the invention, which adjusts driving circuit, PWM drivings are single
Member 201, sound volume regulation unit 301 and buzzer 401.Described control unit control connection PWM driving units 201 and volume adjustment
Unit 301, the PWM driving units 201 and sound volume regulation unit 301 are electrically connected buzzer 401.
Described control unit 101 exports two groups of control signals, wherein one group of control signal is for controlling PWM driving units
201, when it is high level or low level to control signal, PWM driving units 201 export PWM waveform, for driving buzzer 401
It pipes；Another group of control signal is for controlling sound volume regulation unit 301, when needing to adjust the volume of buzzer, volume adjustment
Unit 301 exports the signal of different intensity, the signal strength that buzzer 401 is exported according to sound volume regulation unit 301, to send out
The volume of varying strength, to realize the volume control of buzzer 401.
Described control unit 101 is a control device, and the control device with I/O interface such as MCU is selected in the present invention,
One of its function is to control signal by output, realizes the break-make control of PWM driving units 201；Function second is that receiving software
Setting signal, and corresponding signal is passed into sound volume regulation unit 301, adjusts the output signal of sound volume regulation unit 301
Power realizes the volume adjustment of buzzer 401.
The PWM driving units 201 are the PWM waves for the RC multi-resonant oscillating circuits either other forms being made of triode
Circuit, device or device occur for shape.
The sound volume regulation unit 301 is the digital regulation resistance being configured by MCU or other control devices, simulates
Switch, slide rheostat either play the device or device of other change resistance of slide rheostat.
The mode for adjusting buzzer volume is software setting either level setting switches or knob or other tune
Section mode.
Referring to Fig. 2, the present invention provides a kind of specific embodiment, wherein the PWM driving units 201 are one by three poles
The RC multi-resonant oscillating circuits that pipe is constituted.The principle of PWM driving unit circuit starting of oscillations is mainly the charge and discharge by resistance and capacitance
Make triode alternate conduction.
201 circuit structure of PWM driving units is：Including the first triode Q1 and the second triode Q2, described first
The emitter-base bandgap grading of triode Q1 connect and is grounded with the emitter-base bandgap grading of the second triode Q2；The collector of the first triode Q1 passes through the first electricity
Hinder R1 connection power supplys VCC；The base stage of the first triode Q1 passes through 3rd resistor R3 connection power supplys VCC；Two or three pole
The collector of pipe Q2 passes through the 4th resistance R4 connection power supplys VCC；The base stage of the second triode Q2 is connected by second resistance R2
Power supply VCC；It is provided with the first capacitance C1 between the collector and the base stage of the second triode of first triode；Two or three pole
The second capacitance C2 is provided between the collector of pipe and the base stage of the first triode；The base stage of second triode passes through the 5th resistance
The output end of R connection control units, collector, that is, PWM driving units of second triode connects buzzer circuit, tool
Body is the base stage for connecting the third transistor Q in buzzer circuit, the digital current potential of emitter-base bandgap grading connection of the third transistor Q
The collector of device, the third transistor Q connects buzzer.
First, it when circuit powers on, is charged respectively by R1 couples of the first capacitance C1 of first resistor, passes through the 4th resistance
R4 couples of the second capacitance C2 charges.It, can be false since the parameter of the first triode Q1 and the second triode Q2 are not quite identical
If the first triode Q1 saturation conductions first, since the voltage at capacitance both ends cannot be mutated, the base stage of the second triode Q2 is at this time
Become negative pressure, the second triode Q2 cut-offs, the PWM drive circuit exports high level；First capacitance C1 passes through second resistance R2
It charges, when the current potential of the second capacitance C2 makes the poles BE forward bias, the second triode Q2 conductings, the PWM drive circuit
Export low level；Similarly the second capacitance C2 both end voltages cannot be mutated, and the base voltage of the first triode Q1 becomes negative pressure, at this time
First triode Q1 cut-offs.It moving in circles in this way, the PWM drive circuit will export the square-wave signal of certain frequency, to
Realize the driving that pipes of passive buzzer 401.The output signal frequency of the PWM drive circuit is by second resistance R2 and first
The control of capacitance C1,3rd resistor R3 and the second capacitance C2 charge/discharge rates.Using the collector of the second triode Q2 as signal
Output, the charging time T1 of second resistance R2 and the first capacitance C1 determine output signal high level time, and 3rd resistor R3
Determine that signal exports low level time with the charging time T2 of the second capacitance C2.And the frequency of signal is：F=1/ (T1+T2).
As for the value of first resistor R1 and the 4th resistance R4, the rising edge and failing edge of pwm signal are only influenced whether, for resistance value
Selection is not strict with.
The sound volume regulation unit 301 is a digital regulation resistance or slide rheostat, and buzzing is adjusted when software inputs
When the parameter of 401 volume of device, control unit 101 will change the control signal of digital regulation resistance, and digital regulation resistance will export
Different parameter, to the sound that pipes of buzzer 401.
The software that embodiment one provides in the present invention and hardware adjustments buzzer volume need to only provide a software operation circle
Bread is contained in the operation interface of cellanalyzer, and user can both be adjusted the size of volume demand according to oneself,
Buzzer volume can change at once after having adjusted, and volume can descending or ascending continuous change
Change.
Embodiment in the present invention and another volume adjusting method that provides is the sound that buzzer is adjusted by hardware mode
Amount needs user to adjust buzzer volume control switch, may be implemented that volume is descending or ascending consecutive variations.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect range.
Claims (6)
1. a kind of buzzer volume of blood analyser adjusts driving circuit, which is characterized in that including control unit, PWM drivings
Unit, sound volume regulation unit and buzzer, described control unit control connection PWM driving units and sound volume regulation unit, it is described
PWM driving units and sound volume regulation unit are electrically connected buzzer；Described control unit exports two groups of control signals：One group of control letter
Number for controlling PWM driving units, when it is high level or low level to control signal, PWM driving units export PWM waveform driving
Buzzer call；Another group of control signal is for controlling sound volume regulation unit, when needing to adjust the volume of buzzer, volume tune
Section unit exports the signal of different intensity, and buzzer sends out varying strength according to the signal strength that sound volume regulation unit exports
Volume.
2. the buzzer volume of blood analyser according to claim 1 adjusts driving circuit, which is characterized in that described
PWM driving units are the RC multi-resonant oscillating circuits being made of triode or can generate PWM waveform circuit, device or device occurs.
3. the buzzer volume of blood analyser according to claim 2 adjusts driving circuit, which is characterized in that the tune
Section buzzer volume is digital regulation resistance either level setting switches or the knob of software control.
4. the buzzer volume of blood analyser according to claim 3 adjusts driving circuit, which is characterized in that described
PWM driving unit circuit structures are：Including the first triode and the second triode, the emitter-base bandgap grading and the two or three of first triode
The emitter-base bandgap grading of pole pipe is connected and is grounded；The collector of first triode connects power supply by first resistor；First triode
Base stage power supply is connected by 3rd resistor；The collector of second triode connects power supply by the 4th resistance；Described second
The base stage of triode connects power supply by second resistance；It is arranged between the collector and the base stage of the second triode of first triode
There is the first capacitance；It is provided with the second capacitance between the collector and the base stage of the first triode of second triode；Described 2nd 3
The base stage of pole pipe connects control unit, the collector output connection buzzer circuit of second triode by the 5th resistance.
5. the buzzer volume of blood analyser according to claim 4 adjusts driving circuit, which is characterized in that specific
The base stage of third transistor in the output end connection buzzer circuit of the PWM driving units, the third transistor are penetrated
Pole connects digital regulation resistance, and the collector of the third transistor connects buzzer.
6. a kind of blood analyser, which is characterized in that be arranged in the blood analyser any one just like in claim 1 to 5
Buzzer volume described in adjusts driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317230.4A CN108806658B (en) | 2017-05-03 | 2017-05-03 | Blood analyzer and buzzer volume adjustment driving circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317230.4A CN108806658B (en) | 2017-05-03 | 2017-05-03 | Blood analyzer and buzzer volume adjustment driving circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108806658A true CN108806658A (en) | 2018-11-13 |
| CN108806658B CN108806658B (en) | 2024-04-16 |
Family
ID=64094444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710317230.4A Active CN108806658B (en) | 2017-05-03 | 2017-05-03 | Blood analyzer and buzzer volume adjustment driving circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108806658B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545178A (en) * | 2019-01-30 | 2019-03-29 | 中科芯集成电路股份有限公司 | A kind of double control buzzer drive circuit |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2314522Y (en) * | 1997-10-17 | 1999-04-14 | 万贤臣 | Optically controlled regulator for telephone ring |
| JP2000278060A (en) * | 1999-03-25 | 2000-10-06 | Matsushita Graphic Communication Systems Inc | Method for tone volume adjustment and tone source drive circuit |
| KR20060016194A (en) * | 2004-08-17 | 2006-02-22 | 엘지전자 주식회사 | Apparatus for controlling volume level of buzzer |
| CN102419970A (en) * | 2011-11-30 | 2012-04-18 | 兴化市华兴机电有限公司 | Alarm buzzer |
| CN203645636U (en) * | 2013-11-12 | 2014-06-11 | 青岛歌尔声学科技有限公司 | Volume adjusting device and electronic apparatus |
| CN104467830A (en) * | 2014-11-19 | 2015-03-25 | 成都创图科技有限公司 | High-stability voltage-controlled oscillator |
| CN104916277A (en) * | 2015-06-11 | 2015-09-16 | 福建新大陆支付技术有限公司 | Volume-adjustable passive magnetoelectric buzzer drive circuit and method |
| CN105045186A (en) * | 2015-08-14 | 2015-11-11 | 佛山市顺德区美的电热电器制造有限公司 | Buzzer volume control apparatus and method for controlling buzzer volume by using the same, and household appliance |
| CN105045185A (en) * | 2015-08-14 | 2015-11-11 | 佛山市顺德区美的电热电器制造有限公司 | Buzzer volume control apparatus and method for controlling buzzer volume by using the same, and household appliance |
| CN204791944U (en) * | 2015-06-11 | 2015-11-18 | 福建新大陆支付技术有限公司 | Passive magneto -electric buzzer drive circuit of volume adjustable |
| CN207529652U (en) * | 2017-05-03 | 2018-06-22 | 深圳市帝迈生物技术有限公司 | A kind of blood analyser and its buzzer volume adjustment driving circuit |
-
2017
- 2017-05-03 CN CN201710317230.4A patent/CN108806658B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2314522Y (en) * | 1997-10-17 | 1999-04-14 | 万贤臣 | Optically controlled regulator for telephone ring |
| JP2000278060A (en) * | 1999-03-25 | 2000-10-06 | Matsushita Graphic Communication Systems Inc | Method for tone volume adjustment and tone source drive circuit |
| KR20060016194A (en) * | 2004-08-17 | 2006-02-22 | 엘지전자 주식회사 | Apparatus for controlling volume level of buzzer |
| CN102419970A (en) * | 2011-11-30 | 2012-04-18 | 兴化市华兴机电有限公司 | Alarm buzzer |
| CN203645636U (en) * | 2013-11-12 | 2014-06-11 | 青岛歌尔声学科技有限公司 | Volume adjusting device and electronic apparatus |
| CN104467830A (en) * | 2014-11-19 | 2015-03-25 | 成都创图科技有限公司 | High-stability voltage-controlled oscillator |
| CN104916277A (en) * | 2015-06-11 | 2015-09-16 | 福建新大陆支付技术有限公司 | Volume-adjustable passive magnetoelectric buzzer drive circuit and method |
| CN204791944U (en) * | 2015-06-11 | 2015-11-18 | 福建新大陆支付技术有限公司 | Passive magneto -electric buzzer drive circuit of volume adjustable |
| CN105045186A (en) * | 2015-08-14 | 2015-11-11 | 佛山市顺德区美的电热电器制造有限公司 | Buzzer volume control apparatus and method for controlling buzzer volume by using the same, and household appliance |
| CN105045185A (en) * | 2015-08-14 | 2015-11-11 | 佛山市顺德区美的电热电器制造有限公司 | Buzzer volume control apparatus and method for controlling buzzer volume by using the same, and household appliance |
| CN207529652U (en) * | 2017-05-03 | 2018-06-22 | 深圳市帝迈生物技术有限公司 | A kind of blood analyser and its buzzer volume adjustment driving circuit |
Non-Patent Citations (1)
| Title |
|---|
| 颜东亮;王健;: "家用电器蜂鸣声音的音乐化设计", 通讯世界, no. 06 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545178A (en) * | 2019-01-30 | 2019-03-29 | 中科芯集成电路股份有限公司 | A kind of double control buzzer drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108806658B (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207529652U (en) | A kind of blood analyser and its buzzer volume adjustment driving circuit | |
| EP3940399A1 (en) | Load detection system and load detection method thereof | |
| CN111585562A (en) | Capacitive touch sensing unit for nerve morphology output | |
| CN105846990A (en) | Improved normative Chua's chaotic circuit | |
| CN108806658A (en) | A kind of blood analyser and its buzzer volume adjust driving circuit | |
| CN203275469U (en) | Switch-type electronic load | |
| CN105099403A (en) | Voice signal generator capable of adjusting pulse waveforms | |
| CN218850753U (en) | Signal intensity adjusting circuit, infrared touch device and electronic equipment | |
| CN207895046U (en) | A kind of intelligent test device of residual current action protector | |
| CN208140793U (en) | A kind of super low-power consumption battery voltage sampling circuit | |
| KR20160125319A (en) | Apparatus of skin care | |
| CN202565454U (en) | Line control circuit of earphone | |
| CN105320005B (en) | Alarm clock circuitry and stereo set | |
| CN103036532B (en) | Automatic testing circuit for low power elements | |
| CN109839529A (en) | The test device and test method of chip operating voltage | |
| CN204031099U (en) | A kind of square-wave generator | |
| CN104092376B (en) | A kind of Novel DC multilevel decompression mu balanced circuit | |
| CN208092999U (en) | A kind of vibration module for teaching programming plate | |
| CN107834999B (en) | Single pulse and continuous pulse generator based on Schmitt trigger | |
| CN112147416A (en) | Mutual capacitance detection circuit with voltage regulation function and mutual capacitance detection system | |
| RU96430U1 (en) | DEVICE FOR EXPRESS DIAGNOSTICS OF IDENTITY OF TRANSISTORS | |
| KR101792823B1 (en) | Apparatus of skin care | |
| CN101237227A (en) | Analog continuous triangular signal generator based on built-in slice | |
| CN102253259B (en) | Adjustable resistance type testing device for mobile terminal | |
| CN108615490A (en) | test circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |