CN2565094Y - Sound, light and magnetic combined experiment teaching aid - Google Patents
Sound, light and magnetic combined experiment teaching aid Download PDFInfo
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- CN2565094Y CN2565094Y CN 02235546 CN02235546U CN2565094Y CN 2565094 Y CN2565094 Y CN 2565094Y CN 02235546 CN02235546 CN 02235546 CN 02235546 U CN02235546 U CN 02235546U CN 2565094 Y CN2565094 Y CN 2565094Y
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- amplifier
- light
- sound
- teaching aid
- signal
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Abstract
The utility model relates to a sound, light and magnetic combined experiment teaching aid which comprises a power supply, a power supply switch and a turn knob for sound volume. An output end of an amplifier is provided with a horn, and an input end of the amplifier is provided with a device which can respectively receive a sound signal, a light signal and a magnetic signal and can lead the sound signal, the light signal and the magnetic signal to be converted into an electric signal. The utility model has the advantages of easy fabrication and more functions. The utility model can be used for carrying out a demonstration experiment for sound waves, a demonstration experiment for optical fiber communication, and a demonstration experiment for searching the strength of a magnetic field around current. The utility model can also be used as a voice frequency receiver.
Description
(1) technical field: the utility model relates to a kind of instruments used for education, further is the combination experiment teaching aid, especially for the combination experiment teaching aid of demonstration sound, light, magnetic signal.
(2) background technology: at present in senior middle school physics teaching, in the lecture experiments such as magnetic field power around sound wave, optical fiber communication, the probe current and direction, do not have equipment special, adopt a plurality of equipment collocation to carry out usually, troublesome poeration not only, and be difficult for successfully.
(3) summary of the invention: the purpose of this utility model is to provide a kind of sound, light, magnetic combination experiment teaching aid that can carry out sound, light, magnetic signal demonstration easily.
The purpose of this utility model realizes by following scheme: sound, light, magnetic combination experiment teaching aid, comprise the power supply that amplifier and amplifier work often need, power switch, volume knob, loudspeaker, amplifier comprises prime amplifier and power amplifier, it is characterized in that: the prime amplifier input end also is provided with audio input jack, photoelectric cell and bar magnet coil, voice signal transforms and is undertaken by moving-coil microphone, light signal transforms and is undertaken by photoelectric cell, magnetic signal transforms and is undertaken by the bar magnet coil, output terminal in preposition amplification is provided with the audio signal output socket, so that the output audio electric signal.
Principle of work of the present utility model following (referring to Fig. 1): by microphone voice signal is converted into electric signal, light signal (comprising infrared ray) is converted into electric signal, magnetic signal is converted into electric signal by the bar magnet coil by photoelectric cell; To export by loudspeaker with the power on signal input amplifier respectively.From the audio frequency accessory power outlet of the output terminal of prime amplifier, exportable sound signal is demonstrated.
The utility model is the improvement to general amplifier, has increased sound, light, magnetic and has been converted into the system and the audio frequency accessory power outlet of electric signal, makes advantage simple, a tractor serves several purposes thereby have, and can carry out: 1, sound wave lecture experiment; 2, optical fiber communication lecture experiment; 3, probe current surrounding magnetic field lecture experiment; 4, making voice receiver uses.
(4) description of drawings: Fig. 1 is the utility model principle of work block scheme; Fig. 2 is the utility model surface structure synoptic diagram; Fig. 3 is the utility model embodiment 1 electrical block diagram; Fig. 4 is the utility model embodiment 2 electrical block diagrams; Fig. 5 is the utility model modulation circuit for lamp synoptic diagram.
(5) embodiment: utility model is further described below in conjunction with embodiment:
Embodiment 1: as shown in Figure 2, the utility model peripheral hardware partly comprises: the back side is provided with battery case, can adorn No. 1 dry cell of 4 joints as direct supply, the front is provided with photoelectric cell (3), volume knob (8), loudspeaker (10), there is audio input jack (1) top, right side, the below knob is power switch (12), and two binding posts at instrument top are audio frequency accessory power outlet (7).
As shown in Figure 3, a utmost point of audio input jack (1) is connected with photoelectric cell (3) by selector switch (2) (held a concurrent post by jack, do not mark among the figure), and passes through capacitor C
1Be connected between the input end and ground of prime amplifier (4), generally speaking, photoelectric cell is in conducting state, and light signal (comprising infrared ray) can be converted into electric signal by photoelectric cell; When microphone (5) (not drawing among the figure) or bar magnet coil (6) plug insertion audio input jack, because the effect of selector switch, photoelectric cell meeting automatic cutout, voice signal can be converted into audio electrical signal by moving-coil microphone, magnetic signal can be converted into electric signal by the bar magnet coil, thereby enters the input end of preposition amplification.
The output terminal of prime amplifier passes through capacitor C
2Be connected with audio frequency accessory power outlet (7), the other end ground connection of audio frequency accessory power outlet, by the exportable audio electrical signal of audio frequency accessory power outlet, the output terminal of prime amplifier is by variable resistor (8) (as volume knob), capacitor C
3Connect the input end of power amplifier (9), the output terminal of power amplifier passes through capacitor C
4Be connected with loudspeaker (10), power supply (11) is connected in the circuit by power switch (12).
For cooperating the light signal transformation demonstration, design one and be used to launch the modulation lamp (13) that has the sound signal modulated beam of light, as shown in Figure 5, it is configured to: audio frequency input socket (13-1) is connected on the input end of coupling transformer (13-2), the output terminal of coupling transformer is connected to power supply (13-3), switch (13-4) and bulb (13-5), the electric signal that has audio frequency to the audio input jack input, bulb will send the modulated beam of light of the signal that has audio frequency, modulated beam of light is gone out audio electrical signal by the photoelectric cell receiving demodulation and sends into amplifier, just can hear sound from loudspeaker.
For cooperating the magnetic signal transformation demonstration, design a becket, in becket, feed wireless tone currents, in the magnetic field that the inside and outside just generation of ring becomes with tone currents, the bar magnet coil is placed in this magnetic field will produce the frequency induction electric current, is exaggerated the back and just can hears sound.
Embodiment 2: as shown in Figure 4, increasing each electron device is in order to optimize function of the present utility model.Prime amplifier can be selected the LA3210 integrated package for use, also available NPN type triode substitutes, and power amplifier can be selected the LA4100 integrated package for use, and integrated package and triode are all according to a conventional method in the place in circuit, the resistance range of volume knob is 0-4.7K Ω, and the value of each electric capacity is respectively: C
110 μ F, C
210 μ F, C
34.7 μ F, C
4470 μ F, C
533 μ F, C
6100 μ F, C
730PF, C
8100 μ F, C
90.022 μ F, C
10220 μ F, C
11100 μ F, C
1233 μ F, C
1350PF, C
14560PF, C
150.15 μ F, C
16200 μ F, C
170.33 μ F, C
18220 μ F, the value of each resistance is respectively: R
112K Ω, R
256K Ω, R
36.8K Ω, R
4100K Ω, R
5220 Ω, R
6100 Ω, R
71.2K Ω.
Amplifier section of the present utility model can be substituted by general receiver circuit.
Use the utility model, can carry out sound, light, magnetic teaching and experimental demonstration:
1, sound wave demonstration.Audio socket is linked to each other with oscillograph, insert microphone, play various sound facing to microphone, can on oscillograph, see corresponding waveform, the distance of adjustment and microphone, the amplitude that can obtain being fit to, volume knob transferred big, can also from loudspeaker, hear the sound that has amplified.
In addition, electrodynamic type loudspeaker or earphone with after standby plug links to each other, are inserted and just can be used as microphone and use, utilize the demonstration of this instrument, can help the student to understand the principle of work of moving-coil microphone.
2, optical fiber communication lecture experiment.Pull up microphone, the automatic place in circuit of photoelectric cell, with the modulation lamp send through the light beam irradiates of voice modulation to photoelectric cell, the photoelectric cell receiving optical signals also demodulates audio electrical signal and sends into amplifier, emits sound from loudspeaker.Also can allow light beam after level crossing repeatedly reflects, throw on the photoelectric cell, thereby reach the purpose of propagation path in the analog optical fiber.
In addition, when light beam constantly is blocked, from loudspeaker, can hear " clatter, clatter " sound, but the principle of work of this phenomenon aid illustration photoelectric counting.In addition, the infrared ray that normal remote control is sent is thrown on the photoelectric cell, from loudspeaker, can be heard " clatter, clatter " sound, thereby finish infrared ray and electric conversion.
3, be used for probe current surrounding magnetic field lecture experiment.
Feed wireless tone currents to becket, inside and outside ring, just produce the magnetic field that becomes with tone currents like this, the bar magnet coil is placed in this magnetic field will produce the frequency induction electric current, and have only that sound just can be maximum when the bar magnet axis passes when magnetic induction line, therefore, just can infer the DISTRIBUTION OF MAGNETIC FIELD situation from the orientation of bar magnet.
In addition, with the bar magnet coil be placed on be connected with tone currents adopt respectively two-wire and around with single line around measuring resistance by, will find to adopt two-wire and around measuring resistance around magnetic field very weak, can help the student to understand two-wire and around the principle of eliminating self-induction,
4, use as voice receiver.
As audio transmitter is arranged in the campus, the bar magnet coil is replaced microphone insert amplifier, turn on the power switch, just can receive the signal of audio transmitter output, can listen to for the student in the whole classroom not wearing under the situation that receives earphone.
Claims (5)
1, sound, light, magnetic combination experiment teaching aid, comprise power supply, power switch, volume knob, loudspeaker that amplifier and amplifier work often need, amplifier comprises prime amplifier and power amplifier, it is characterized in that: the prime amplifier input end also is provided with audio input jack, photoelectric cell and bar magnet coil, is provided with the audio signal output socket at the output terminal of preposition amplification.
2, sound according to claim 1, light, magnetic combination experiment teaching aid is characterized in that: the amplifying circuit that prime amplifier and power amplifier are made up of triode.
3, sound according to claim 1, light, magnetic combination experiment teaching aid, it is characterized in that: prime amplifier and power amplifier are the integrated packages with corresponding enlarging function.
4, sound according to claim 1, light, magnetic combination experiment teaching aid, it is characterized in that: the audio electrical signal that photoelectric cell receives, sent by the modulation lamp, modulation lamp structure comprises that the input end of coupling transformer is connected to the audio frequency input socket, and output terminal is connected to power supply, switch and bulb.
5, sound according to claim 1, light, magnetic combination experiment teaching aid is characterized in that: bar magnet coil magnetic field of living in is produced by the tone currents in the becket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02235546 CN2565094Y (en) | 2002-05-24 | 2002-05-24 | Sound, light and magnetic combined experiment teaching aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02235546 CN2565094Y (en) | 2002-05-24 | 2002-05-24 | Sound, light and magnetic combined experiment teaching aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2565094Y true CN2565094Y (en) | 2003-08-06 |
Family
ID=33710029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02235546 Expired - Fee Related CN2565094Y (en) | 2002-05-24 | 2002-05-24 | Sound, light and magnetic combined experiment teaching aid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2565094Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096713A (en) * | 2015-09-07 | 2015-11-25 | 李耀俊 | Magneto-optical communication combined demonstration instrument |
-
2002
- 2002-05-24 CN CN 02235546 patent/CN2565094Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096713A (en) * | 2015-09-07 | 2015-11-25 | 李耀俊 | Magneto-optical communication combined demonstration instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |