CN210469723U - High-sensitivity wireless sniffer circuit - Google Patents
High-sensitivity wireless sniffer circuit Download PDFInfo
- Publication number
- CN210469723U CN210469723U CN201921846149.6U CN201921846149U CN210469723U CN 210469723 U CN210469723 U CN 210469723U CN 201921846149 U CN201921846149 U CN 201921846149U CN 210469723 U CN210469723 U CN 210469723U
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- circuit
- amplifier
- pin
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a high sensitive wireless sound finder circuit, including battery BT, MIC circuit, integrated operational amplifier circuit, high frequency oscillation circuit, battery BT and MIC circuit, integrated operational amplifier circuit, high frequency oscillation circuit are connected, MIC circuit and integrated operational amplifier circuit connection, integrated operational amplifier circuit and high frequency oscillation circuit connection, this system a high sensitive wireless sound finder circuit, can make the sound finder long-time.
Description
Technical Field
The utility model relates to a high sensitive wireless sniffer circuit.
Background
In the prior art, the application of the sound detector in life is more and more extensive, the sound detector is quite applied to activities of household burglary prevention, detection and counterdetection, is designed to be small and convenient to carry, has functions meeting the requirements of most people, and has various problems of the sound detector exposed along with the increase of the number of people using the sound detector, wherein the sensitivity problem is very important, and the sound detector is not only related to the receiving of a sound source, but also related to the use quality of the sound detector. Sometimes, the sound detector will have amazing wonderful failure and cannot receive sound, which is generally caused by low sensitivity of the sound detector system.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a high sensitive wireless sniffer circuit.
The utility model discloses a following technical scheme can realize.
The utility model provides a pair of high sensitive wireless sound finder circuit, including battery BT, MIC circuit, integrated operational amplifier circuit, high frequency oscillation circuit, battery BT and MIC circuit, integrated operational amplifier circuit, high frequency oscillation circuit are connected, and MIC circuit and integrated operational amplifier circuit are connected, and integrated operational amplifier circuit is connected with high frequency oscillation circuit.
The integrated operational amplifier circuit comprises an amplifier U1, a resistor R5 and a resistor R7, wherein a pin 1 of the amplifier U1 is connected with one end of the resistor R5, and a pin 6 and a pin 7 of the amplifier U1 are respectively connected with two ends of a resistor R7.
The MIC circuit comprises a microphone MIC, capacitors C1-C3, resistors R1-R4, a resistor R6 and a potentiometer RPA, wherein one end of the microphone MIC is respectively connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the capacitor C1 is connected with one end of a resistor R4, the other end of the resistor R1 is respectively connected with an end a of a resistor R2 and a pin 4 of an amplifier U1, the other end of a resistor R4 is respectively connected with the other end of a resistor R5 and a pin 2 of an amplifier U1, an end b of a resistor R2 is respectively connected with an end C of a resistor R3, one end of a capacitor C2 and a pin 5 of an amplifier U1, an end d of a resistor R3 is respectively connected with the other end of the microphone MIC, the other end of a capacitor C2, one end of a binding post of the potentiometer RPA, and an end 11 pin 11 of an amplifier U1, the other end of the binding post of the potentiometer RPA is respectively connected with one end of the amplifier U1, the other, the other end of the capacitor C4 is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with a pin 6 of the amplifier U1 and one end of a resistor R7 respectively.
The high-frequency oscillation circuit comprises a triode D-50, capacitors C5-C10, a resistor R8, a resistor R9 and an inductor L, wherein the base of the triode D-50 is connected with one end of a capacitor C5 and one end of a capacitor C6, the other end of the capacitor C6 is connected with the end a of a resistor R2, the end e of the capacitor C7 and one end of a capacitor C10 respectively, the other end of the capacitor C5 is connected with the 7 pin of an amplifier U1, the resistor R8 is connected with the capacitor C6 in parallel, the emitter of the triode D-50 is connected with the end g of the resistor R9, the end g of the resistor R9 is connected with one end of a capacitor C8, the other end of the capacitor C8 is connected with the end f of the capacitor C7 and the collector of the triode D-50 respectively, the end h of the resistor R7 is connected with the end D of the resistor R7, the capacitor C7 is connected with the resistor R7 in parallel, one end of the capacitor C7 is connected with the end e of the capacitor C7, the terminal f of the capacitor C7 is connected with the other terminal of the inductor L.
The positive electrode of the battery is connected with one end of a switch S, the negative electrode of the battery is connected with the h end of a resistor R9, and the other end of the switch S is connected with the e end of a capacitor C7.
The amplifier U1 is model LM 324.
The beneficial effects of the utility model reside in that: the high-sensitivity wireless sniffer circuit can enable the sniffer to operate for a long time and with high sensitivity, does not affect the use function of the sniffer, and ensures the normal work of the sniffer.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
A high-sensitivity wireless sniffer circuit comprises a battery BT, an MIC circuit, an integrated operational amplifier circuit and a high-frequency oscillation circuit, wherein the battery BT is connected with the MIC circuit, the integrated operational amplifier circuit and the high-frequency oscillation circuit, the MIC circuit is connected with the integrated operational amplifier circuit, and the integrated operational amplifier circuit is connected with the high-frequency oscillation circuit.
The integrated operational amplifier circuit comprises an amplifier U1, a resistor R5 and a resistor R7, wherein a pin 1 of the amplifier U1 is connected with one end of the resistor R5, and a pin 6 and a pin 7 of the amplifier U1 are respectively connected with two ends of a resistor R7.
The MIC circuit comprises a microphone MIC, capacitors C1-C3, resistors R1-R4, a resistor R6 and a potentiometer RPA, wherein one end of the microphone MIC is respectively connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the capacitor C1 is connected with one end of a resistor R4, the other end of a resistor R1 is respectively connected with an a end of a resistor R2 and 4 pins of an amplifier U1, the other end of the resistor R4 is respectively connected with the other end of a resistor R5 and 2 pins of an amplifier U1, an b end of the resistor R2 is respectively connected with a C end of the resistor R2, one end of the capacitor C2 and one end of the amplifier U2, a d end of the resistor R2 is respectively connected with the other end of the microphone MIC, the other end of the capacitor C2, one end of the potentiometer RPA binding post, one end of the amplifier U2 and an 11 pin 11 of the amplifier U2, the other end of the potentiometer RPA binding post is respectively connected with one end of the capacitor C2, the other end of, the other end of the resistor R6 is respectively connected with a pin 6 of the amplifier U1 and one end of the resistor R7, when a microphone MIC picks up a weak sound signal, a signal voltage is generated at the two ends of the microphone MIC, the signal voltage is coupled to a pin 3 of the amplifier U1 through the capacitor C1 to carry out first-stage amplification, the amplification gain of the first-stage amplification reaches more than 20 dB, the signal voltage is output from a pin 1 of the amplifier U1 after the first-stage amplification, the signal voltage is coupled through the capacitor C3, the potentiometer RPA controls the signal to enter a pin 5 of the amplifier U1 to carry out second-stage amplification, and any weak sound signal is amplified to have enough amplitude after the second-stage amplification and then is coupled into the high-frequency oscillation circuit through the capacitor C5.
The high-frequency oscillation circuit comprises a triode D-50, capacitors C5-C10, a resistor R8, a resistor R9 and an inductor L, wherein the base of the triode D-50 is connected with one end of a capacitor C5 and one end of a capacitor C6, the other end of the capacitor C6 is connected with the end a of the resistor R2, the end e of the capacitor C7 and one end of the capacitor C10 respectively, the other end of the capacitor C5 is connected with the 7 pin of an amplifier U1, the resistor R8 is connected with the capacitor C6 in parallel, the emitter of the triode D-50 is connected with the end g of the resistor R9, the end g of the resistor R9 is connected with one end of the capacitor C9, the other end of the capacitor C9 is connected with the end f of the capacitor C9 and the collector of the triode D-50 respectively, the end h of the resistor R9 is connected with the end D of the resistor R9, the capacitor C9 is connected with the resistor R9 in parallel, one end of the capacitor C9 is connected with the end e of the other end of the capacitor C9, the end of the capacitor C9, the resonant frequency in the circuit is designed in the range of 88-108 MHz of an FM wave band, a carrier wave modulated by audio frequency is transmitted to the surrounding space through a transmitting antenna W, and can be heard outside 100M by using an FM radio, wherein R5 and R7 are negative feedback resistors of an operational amplifier, and the amplification gain can be changed by adjusting the resistance values of the negative feedback resistors.
The positive electrode of the battery is connected with one end of a switch S, the negative electrode of the battery is connected with the h end of a resistor R9, and the other end of the switch S is connected with the e end of a capacitor C7.
The amplifier U1 is model LM 324.
The working principle of the system is as follows: when the microphone MIC picks up a weak sound signal, a signal voltage is generated at two ends of the microphone MIC, the signal voltage is coupled to a pin 3 of a first-stage amplifier U1 through a capacitor C1 for amplification, the amplification gain of the signal voltage reaches more than 20 decibels, the signal voltage is output from a pin 1 of an amplifier U1 after the signal voltage is amplified by the first stage, the signal voltage is coupled through a capacitor C3, a potentiometer RP controls the signal voltage to enter a pin 5 of an amplifier U1 for second-stage amplification, and after the second-stage amplification, any weak sound signal is amplified to a sufficient amplitude and then is coupled to a high-frequency transmitting circuit through a C5. The high-frequency transmitting oscillation circuit is composed of a special high-efficiency transmitting tube V and an LC oscillation circuit, the resonance frequency of the high-frequency transmitting oscillation circuit is designed in the range of 88-108 MHz of an FM wave band, a carrier wave modulated by audio frequency is transmitted to the surrounding space through a transmitting antenna W, and can be heard outside 100M by using an FM radio, wherein R5 and R7 are negative feedback resistors of an operational amplifier, and the amplification gain can be changed by adjusting the resistance value of the operational amplifier.
Claims (6)
1. A high sensitivity wireless sniffer circuit, characterized by: the battery BT is connected with the MIC circuit, the integrated operational amplifier circuit and the high-frequency oscillation circuit, the MIC circuit is connected with the integrated operational amplifier circuit, and the integrated operational amplifier circuit is connected with the high-frequency oscillation circuit.
2. A highly sensitive wireless sniffer circuit as claimed in claim 1, characterized in that: the integrated operational amplifier circuit comprises an amplifier U1, a resistor R5 and a resistor R7, wherein a pin 1 of the amplifier U1 is connected with one end of the resistor R5, and a pin 6 and a pin 7 of the amplifier U1 are respectively connected with two ends of a resistor R7.
3. A highly sensitive wireless sniffer circuit as claimed in claim 1, characterized in that: the MIC circuit comprises a microphone MIC, capacitors C1-C3, resistors R1-R4, a resistor R6 and a potentiometer RPA, wherein one end of the microphone MIC is respectively connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the capacitor C1 is connected with one end of a resistor R4, the other end of the resistor R1 is respectively connected with an end a of a resistor R2 and a pin 4 of an amplifier U1, the other end of a resistor R4 is respectively connected with the other end of a resistor R5 and a pin 2 of an amplifier U1, an end b of a resistor R2 is respectively connected with an end C of a resistor R3, one end of a capacitor C2 and a pin 5 of an amplifier U1, an end d of a resistor R3 is respectively connected with the other end of the microphone MIC, the other end of a capacitor C2, one end of a binding post of the potentiometer RPA, and an end 11 pin 11 of an amplifier U1, the other end of the binding post of the potentiometer RPA is respectively connected with one end of the amplifier U1, the other, the other end of the capacitor C4 is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with a pin 6 of the amplifier U1 and one end of a resistor R7 respectively.
4. A highly sensitive wireless sniffer circuit as claimed in claim 1, characterized in that: the high-frequency oscillation circuit comprises a triode D-50, capacitors C5-C10, a resistor R8, a resistor R9 and an inductor L, wherein the base of the triode D-50 is connected with one end of a capacitor C5 and one end of a capacitor C6, the other end of the capacitor C6 is connected with the end a of a resistor R2, the end e of the capacitor C7 and one end of a capacitor C10 respectively, the other end of the capacitor C5 is connected with the 7 pin of an amplifier U1, the resistor R8 is connected with the capacitor C6 in parallel, the emitter of the triode D-50 is connected with the end g of the resistor R9, the end g of the resistor R9 is connected with one end of a capacitor C8, the other end of the capacitor C8 is connected with the end f of the capacitor C7 and the collector of the triode D-50 respectively, the end h of the resistor R7 is connected with the end D of the resistor R7, the capacitor C7 is connected with the resistor R7 in parallel, one end of the capacitor C7 is connected with the end e of the capacitor C7, the terminal f of the capacitor C7 is connected with the other terminal of the inductor L.
5. A highly sensitive wireless sniffer circuit as claimed in claim 1, characterized in that: the positive electrode of the battery is connected with one end of a switch S, the negative electrode of the battery is connected with the h end of a resistor R9, and the other end of the switch S is connected with the e end of a capacitor C7.
6. A high sensitivity wireless sniffer circuit as claimed in any one of claims 1 to 5, wherein: the amplifier U1 is model LM 324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921846149.6U CN210469723U (en) | 2019-10-30 | 2019-10-30 | High-sensitivity wireless sniffer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921846149.6U CN210469723U (en) | 2019-10-30 | 2019-10-30 | High-sensitivity wireless sniffer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210469723U true CN210469723U (en) | 2020-05-05 |
Family
ID=70436197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921846149.6U Expired - Fee Related CN210469723U (en) | 2019-10-30 | 2019-10-30 | High-sensitivity wireless sniffer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210469723U (en) |
-
2019
- 2019-10-30 CN CN201921846149.6U patent/CN210469723U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107395253B (en) | Novel network hunting device capable of adapting to fast and high-speed switch | |
| US9124973B2 (en) | Earphone jack circuit and portable electronic device using the same | |
| CN102355618A (en) | Modulated wave wireless microphone | |
| CN210469723U (en) | High-sensitivity wireless sniffer circuit | |
| CN202737853U (en) | FM transmitter with low power and high sensitivity | |
| CN205902055U (en) | Highly sensitive wireless monitor | |
| CN212752257U (en) | Interphone circuit and interphone comprising same | |
| CN218416363U (en) | Broadcast television antenna signal receiving circuit | |
| CN102595291A (en) | Minitype frequency modulation wireless microphone | |
| CN202143205U (en) | Amplitude-modulated wave wireless microphone | |
| CN210670431U (en) | Wireless microphone | |
| CN105979435A (en) | High sensitivity wireless monitor | |
| CN221575346U (en) | Multi-spectrum radio technology reconnaissance equipment | |
| CN103096212A (en) | Low-voltage single-tube frequency modulation wireless microphone | |
| CN204244181U (en) | The amplifying circuit of analog signal of radiofrequency signal | |
| CN213634163U (en) | Wireless receiving circuit for smoke generating device | |
| CN203233413U (en) | A simple frequency modulation communication instrument | |
| CN208174666U (en) | A kind of simple audiomonitor | |
| CN203446025U (en) | Wireless multifunctional sound collection emitter | |
| CN211481268U (en) | Receiving and transmitting system for double-channel voice simultaneous transmission | |
| CN219802326U (en) | Radio frequency front end module, diode bias module, chip and equipment | |
| CN2167485Y (en) | Infrared monolithic wireless ear phone | |
| CN202931294U (en) | High sensitivity FM transmitter | |
| CN204697055U (en) | A kind of simple and practical interphone circuit | |
| CN208029037U (en) | A kind of noise reduction voice collection device and sound processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200505 Termination date: 20201030 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |