CN103427851A - Multifunctional miniature frequency modulation emitter - Google Patents
Multifunctional miniature frequency modulation emitter Download PDFInfo
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- CN103427851A CN103427851A CN2012101593486A CN201210159348A CN103427851A CN 103427851 A CN103427851 A CN 103427851A CN 2012101593486 A CN2012101593486 A CN 2012101593486A CN 201210159348 A CN201210159348 A CN 201210159348A CN 103427851 A CN103427851 A CN 103427851A
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Abstract
The invention discloses a multifunctional miniature frequency modulation emitter. The multifunctional miniature frequency modulation emitter comprises batteries, an antenna, a microphone, a switch, a first audion, a second audion, 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. According to the multifunctional miniature frequency modulation emitter, the output power is not larger than 5-8mW, the emission range can reach about 300 meters in the house area, and a common FM radio can be used for receiving frequency. The multifunctional miniature frequency modulation emitter can have the emitting capacity with a 3V power source and the half-wave antenna, and therefore when the multifunctional miniature frequency modulation emitter is used, the modulation degree is high, amplitude modulation is avoided, distortion is small, the signal emission and transmission distance is long, work is stable, and power consumption of circuits is smaller than 5mA. The multifunctional miniature frequency modulation emitter can continuously work for 80-100 hours with two dry batteries, the circuits work stable in the normal work state, frequency drift is small, and interference is small.
Description
Technical field
The present invention relates to a kind of broadcast receiver modulated transmitting device, relate 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 form, its sensitivity and definition are poor, consume energy high, therefore can cause modulation degree than 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
Purpose of the present invention provides a kind of multifunction micro frequency-modulated transmitter with regard to being in order to address the above problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes 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 is connected with the first end of described the first resistance, 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 is connected with the first end of described microphone, the second end of described microphone is connected with the first end of described the first electric capacity with the second end of described the first resistance simultaneously, the second end of described the first electric capacity is connected with the first end of described the second resistance with the base stage of described the first triode simultaneously, 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 is connected with the base stage of described the first triode, 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 is connected with the second end of described the 3rd electric capacity, the emitter of described the second triode is connected with the first end of described the 5th electric capacity with the second end of described the 5th resistance simultaneously, 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 is connected with the second end of described the 5th electric capacity.
Further, described the 5th electric capacity is variable capacitance; Described the first triode and described the second triode are NPN type triode.
Beneficial effect of the present invention is:
Power output of the present invention is no more than 5-8mW, transmitting boundary can be to 300 meters left and right in the house district, by a common FM radio reception function, receive, the present invention only need just have so emissivities with 3V power supply and half-wave antenna, therefore, in use modulation degree deeply, does not produce 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.
The accompanying drawing explanation
Accompanying drawing is circuit structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in drawings: the present invention includes battery E, antenna ANT, microphone MIC, switch 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 switch SW, the other end while of switch 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 is connected with the first end of the first resistance R 1, 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 with the first end of microphone MIC, the second end of microphone MIC is connected with the first end of the first capacitor C 1 with the second end of the first resistance R 1 simultaneously, the second end of the first capacitor C 1 is connected with the first end of the second resistance R 2 with the base stage of the first triode Q1 simultaneously, 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 is connected with the base stage of the first triode Q1, the second end while of the second capacitor C 2 and the second end of the 4th resistance R 4, the base stage of the second triode Q2 is connected with the second end of the 3rd capacitor C 3, and the emitter of the second triode Q2 is connected with the first end of the 5th capacitor C 5 with the second end of the 5th resistance R 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, antenna ANT is connected with the second end of the 5th capacitor C 5, 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: the interior actual one piece of FET that keeps of microphone MIC of the present invention, FET amplifies the capacitance variations of vibrating diaphragm before microphone MIC, the very sensitive reason of microphone that Here it is.Audio frequency amplifies is served as by the first triode Q1, gains approximately 20 to 50.Amplifying signal is sent to the base stage of oscillator stage the second triode Q2.The second triode Q2 approximately works in 88MHz, and this frequency is adjusted totally by oscillator coil (5 circles) and the 4th capacitor C 4, and this frequency also is decided by the second triode Q2,18pF tunable capacitor the 5th capacitor C 5 and biased element (as the 5th resistance R 5 and the 4th resistance R 4).After power connection, the 3rd capacitor C 3 is charged gradually by the 4th resistance R 4, and the 5th capacitor C 5 is 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 electric capacity no longer stops emitter potential mobile, and lower voltage between base stage and 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 and surpasses 3V from 2.9V originally, and, in the opposite direction to the 4th capacitor C 4 chargings, this voltage also charges to the 5th capacitor C 5 simultaneously and has increased the voltage drop on the 5th resistance R 5, makes triode enter darker cut-off state.Consumption along with back-emf energy on inductance L, the emitter potential of the second triode Q2 descends, and drop to triode and start conducting, electric current flows into coil reverses the voltage on 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 starts repetition again.Make the second triode Q2 form vibration, produce the AC signal of 88MHz.Audio signal after amplifying from prime is burst into base stage, the change frequency of oscillation of the second triode Q2 through 1 μ F electric capacity, produces required FM signal.
Claims (3)
1. a multifunction micro frequency-modulated transmitter, 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 is connected with the first end of described the first resistance, 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 is connected with the first end of described microphone, the second end of described microphone is connected with the first end of described the first electric capacity with the second end of described the first resistance simultaneously, the second end of described the first electric capacity is connected with the first end of described the second resistance with the base stage of described the first triode simultaneously, 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 is connected with the base stage of described the first triode, 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 is connected with the second end of described the 3rd electric capacity, the emitter of described the second triode is connected with the first end of described the 5th electric capacity with the second end of described the 5th resistance simultaneously, 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 is connected with the second end of described the 5th electric capacity.
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 |
|---|---|---|---|
| CN2012101593486A CN103427851A (en) | 2012-05-22 | 2012-05-22 | Multifunctional miniature frequency modulation emitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101593486A CN103427851A (en) | 2012-05-22 | 2012-05-22 | Multifunctional miniature frequency modulation emitter |
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| CN103427851A true CN103427851A (en) | 2013-12-04 |
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| CN2012101593486A Pending CN103427851A (en) | 2012-05-22 | 2012-05-22 | Multifunctional miniature frequency modulation emitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105783957A (en) * | 2016-03-05 | 2016-07-20 | 马骏 | Novel photoelectric encoder based on wireless communication technology |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201150056Y (en) * | 2007-12-05 | 2008-11-12 | 黄昌雄 | Radio emitter |
| CN101420237A (en) * | 2007-10-22 | 2009-04-29 | 鸿富锦精密工业（深圳）有限公司 | Monitoring circuit |
| CN102158792A (en) * | 2011-01-18 | 2011-08-17 | 黄勇 | Frequency modulation radio microphone |
| CN202696583U (en) * | 2012-05-22 | 2013-01-23 | 成都酷玩网络科技有限公司 | Multi-functional minitype frequency modulation emitter |
-
2012
- 2012-05-22 CN CN2012101593486A patent/CN103427851A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420237A (en) * | 2007-10-22 | 2009-04-29 | 鸿富锦精密工业（深圳）有限公司 | Monitoring circuit |
| CN201150056Y (en) * | 2007-12-05 | 2008-11-12 | 黄昌雄 | Radio emitter |
| CN102158792A (en) * | 2011-01-18 | 2011-08-17 | 黄勇 | Frequency modulation radio microphone |
| CN202696583U (en) * | 2012-05-22 | 2013-01-23 | 成都酷玩网络科技有限公司 | Multi-functional minitype frequency modulation emitter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105783957A (en) * | 2016-03-05 | 2016-07-20 | 马骏 | Novel photoelectric encoder based on wireless communication technology |
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Application publication date: 20131204 |