CN202696583U - Multi-functional minitype frequency modulation emitter - Google Patents
Multi-functional minitype frequency modulation emitter Download PDFInfo
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- CN202696583U CN202696583U CN 201220230801 CN201220230801U CN202696583U CN 202696583 U CN202696583 U CN 202696583U CN 201220230801 CN201220230801 CN 201220230801 CN 201220230801 U CN201220230801 U CN 201220230801U CN 202696583 U CN202696583 U CN 202696583U
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- triode
- electric capacity
- capacitor
- frequency modulation
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Abstract
The utility model discloses a multi-functional minitype frequency modulation emitter, which comprises a battery, a half-wave antenna, a microphone, a switch, a first triode, a second triode, an inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor. Output power of the multi-functional minitype frequency modulation emitter is within 5 to 8 megawatt, the emitting range is as far as 300 meters around a housing area, signals can be received by a common frequency modulation radio, and only a 3-volt power source and the half-wave antenna are used, so that multi-functional minitype frequency modulation emitter is high in modulation degree, small in distortion, long in signal emission distance and stable at work, and causes no amplitude modulation, power consumption of a circuit is less than 5 microampere, two dry cells ensure that the multi-functional minitype frequency modulation emitter, can continuously work for 80 to 100 hours, the circuit works stably under normal conditions, frequency drift is small, and interference is small.
Description
Technical field
The utility model relates to a kind of broadcast receiver modulated transmitting device, relates in particular to a kind of multifunction micro frequency-modulated transmitter.
Background technology
The small-power modulated transmitting device circuit that existing broadcast receiver adopts, great majority adopt integrated circuit to consist of, its sensitivity and definition are relatively poor, power consumption is high, therefore can cause modulation degree more shallow, produce that amplitude modulation(PAM) is excessive, distortion is large, transmitting range is short, job insecurity and the large phenomenon of frequency drift.
Summary of the invention
The purpose of this utility model provides a kind of multifunction micro frequency-modulated transmitter with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises battery, antenna, microphone, switch, the first triode, the second triode, inductance, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, the positive pole of described battery is connected with an end of described switch, the other end while of described switch and the first end of described the 6th electric capacity, the first end of described inductance, the first end of described the 4th electric capacity, the first end of described the 4th resistance, the first end of described the 3rd resistance be connected the first end of the first resistance and connect, the negative pole while of described battery and the second end of described the 6th electric capacity, the first end of described the 5th resistance, the first end of described the 3rd electric capacity, the emitter of described the first triode be connected the first end of microphone and connect, the second end of described microphone simultaneously with the second end of described the first resistance be connected the first end of the first electric capacity and be connected, the second end of described the first electric capacity simultaneously with the base stage of described the first triode be connected the first end of the second resistance and be connected, the second end while of described the second resistance and the second end of described the 3rd resistance, the first end of described the second electric capacity be connected the base stage of the first triode and connect, the second end while of described the second electric capacity and the second end of described the 4th resistance, the base stage of described the second triode be connected the second end of the 3rd electric capacity and connect, the emitter of described the second triode simultaneously with the second end of described the 5th resistance be connected the first end of the 5th electric capacity and be connected the collector electrode while of described the second triode and the second end of described the 4th electric capacity, the second end of described inductance, described antenna be connected the second end of the 5th electric capacity and connect.
Further, described the 5th electric capacity is variable capacitance; Described the first triode and described the second triode are NPN type triode.
The beneficial effects of the utility model are:
The utility model power output is no more than 5-8mW, transmitting boundary is about the house district can be to 300 meters, receive with a common FM radio reception function, the utility model only needs with 3V power supply and half-wave antenna so emissivities are arranged just, therefore, in use modulation degree does not produce deeply, that amplitude modulation(PAM), distortion are little, distance, working stability are sent in the signal emission, and the circuit power consumption is less than 5mA, but with two pieces of dry cell continuous operations 80 to 100 hours; Circuit is highly stable in normal operation, and frequency drift is very little, disturbs less.
Description of drawings
Accompanying drawing is circuit structure schematic diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in drawings: the utility model comprises battery E, antenna ANT, microphone MIC, interrupteur SW, the first triode Q1, the second triode Q2, inductance L, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5 and the 6th capacitor C 6, the positive pole of battery E is connected with an end of interrupteur SW, the other end while of interrupteur SW and the first end of the 6th capacitor C 6, the first end of inductance L, the first end of the 4th capacitor C 4, the first end of the 4th resistance R 4, the first end of the 3rd resistance R 3 be connected the first end of resistance R 1 and connect, the negative pole while of battery E and the second end of the 6th capacitor C 6, the first end of the 5th resistance R 5, the first end of the 3rd capacitor C 3, the emitter of the first triode Q1 is connected first end and is connected with microphone MIC, the second end of microphone MIC simultaneously with the second end of the first resistance R 1 be connected the first end of capacitor C 1 and be connected, the second end of the first capacitor C 1 simultaneously with the base stage of the first triode Q1 be connected the first end of resistance R 2 and be connected, the second end while of the second resistance R 2 and the second end of the 3rd resistance R 3, the first end of the second capacitor C 2 be connected the base stage of triode Q1 and connect, the second end while of the second capacitor C 2 and the second end of the 4th resistance R 4, the second end of the base stage of the second triode Q2 and the 3rd capacitor C 3 connects, the emitter of the second triode Q2 is connected with the second end of the 5th resistance R 5 and the first end of the 5th capacitor C 5 simultaneously, the collector electrode while of the second triode Q2 and the second end of the 4th capacitor C 4, the second end of inductance L, the second end of antenna ANT and the 5th capacitor C 5 connects; The 5th capacitor C 5 is variable capacitance; The first triode Q1 and the second triode Q2 are NPN type triode.
As shown in drawings: actually in the microphone MIC of the present utility model keep one piece of FET, FET with microphone MIC before the capacitance variations of vibrating diaphragm amplify the very sensitive reason of microphone that Here it is.Audio frequency amplifies is served as by the first triode Q1, gains about 20 to 50.Amplifying signal is sent to the base stage of oscillator stage the second triode Q2.The second triode Q2 works in 88MHz approximately, and this frequency is adjusted by oscillator coil (5 circles) and the 4th capacitor C 4 totally, and this frequency also is decided by the second triode Q2,18pF tunable capacitor the 5th capacitor C 5 and biased element (such as the 5th resistance R 5 and the 4th resistance R 4).Behind the power connection, the 3rd capacitor C 3 is charged gradually by the 4th resistance R 4, and the 5th capacitor C 5 is then charged through oscillator coil and the 5th resistance R 5, but faster; 47pF the 4th capacitor C 4 is also charged (though very little voltage is just won at its two ends), and coil produces magnetic field simultaneously.When base voltage rises gradually, the second triode Q2 conducting, and effectively internal resistance is attempted by 18pF the 5th capacitor C 5 both sides.Base voltage continue to rise, and the 5th capacitor C 5 attempts to stop the movement of emitter potential, when the depleted of energy in the electric capacity no longer stops emitter potential mobile, and lower voltage between base stage and the emitter-base bandgap grading, the triode cut-off, the electric current of inflow coil also stops, and magnetic field is declined routed.And produce a reverse voltage, collector potential rises from 2.9V originally and surpasses 3V, and in the opposite direction to the charging of the 4th capacitor C 4, this voltage also simultaneously to 5 chargings of the 5th capacitor C and increased voltage drop on the 5th resistance R 5, makes triode enter darker cut-off state.Consumption along with back-emf energy on the inductance L, the emitter potential of the second triode Q2 descends, and drop to triode and begin conducting, electric current flows into coil reverses the voltage on the coil again, the formation collector potential descends, and be sent to emitter-base bandgap grading by the 5th capacitor C 5, and making the second triode Q2 saturation conduction, the cycle begins repetition again.Make the second triode Q2 form vibration, produce the AC signal of 88MHz.Burst into base stage, the change frequency of oscillation of the second triode Q2 through 1 μ F electric capacity from the audio signal after the prime amplification, produce required FM signal.
Claims (3)
1. multifunction micro frequency-modulated transmitter, it is characterized in that: comprise battery, antenna, microphone, switch, the first triode, the second triode, inductance, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, the positive pole of described battery is connected with an end of described switch, the other end while of described switch and the first end of described the 6th electric capacity, the first end of described inductance, the first end of described the 4th electric capacity, the first end of described the 4th resistance, the first end of described the 3rd resistance be connected the first end of the first resistance and connect, the negative pole while of described battery and the second end of described the 6th electric capacity, the first end of described the 5th resistance, the first end of described the 3rd electric capacity, the emitter of described the first triode be connected the first end of microphone and connect, the second end of described microphone simultaneously with the second end of described the first resistance be connected the first end of the first electric capacity and be connected, the second end of described the first electric capacity simultaneously with the base stage of described the first triode be connected the first end of the second resistance and be connected, the second end while of described the second resistance and the second end of described the 3rd resistance, the first end of described the second electric capacity be connected the base stage of the first triode and connect, the second end while of described the second electric capacity and the second end of described the 4th resistance, the base stage of described the second triode be connected the second end of the 3rd electric capacity and connect, the emitter of described the second triode simultaneously with the second end of described the 5th resistance be connected the first end of the 5th electric capacity and be connected the collector electrode while of described the second triode and the second end of described the 4th electric capacity, the second end of described inductance, described antenna be connected the second end of the 5th electric capacity and connect.
2. multifunction micro frequency-modulated transmitter according to claim 1, it is characterized in that: described the 5th electric capacity is variable capacitance.
3. multifunction micro frequency-modulated transmitter according to claim 1, it is characterized in that: described the first triode and described the second triode are NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220230801 CN202696583U (en) | 2012-05-22 | 2012-05-22 | Multi-functional minitype frequency modulation emitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220230801 CN202696583U (en) | 2012-05-22 | 2012-05-22 | Multi-functional minitype frequency modulation emitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696583U true CN202696583U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220230801 Expired - Fee Related CN202696583U (en) | 2012-05-22 | 2012-05-22 | Multi-functional minitype frequency modulation emitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202696583U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427851A (en) * | 2012-05-22 | 2013-12-04 | 成都酷玩网络科技有限公司 | Multifunctional miniature frequency modulation emitter |
| CN107231149A (en) * | 2017-06-08 | 2017-10-03 | 深圳驰芯微电子有限公司 | Chip |
-
2012
- 2012-05-22 CN CN 201220230801 patent/CN202696583U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427851A (en) * | 2012-05-22 | 2013-12-04 | 成都酷玩网络科技有限公司 | Multifunctional miniature frequency modulation emitter |
| CN107231149A (en) * | 2017-06-08 | 2017-10-03 | 深圳驰芯微电子有限公司 | Chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20130522 |