CN2177306Y - FM receiving and electromagnetic induction dual wireless earphone - Google Patents
FM receiving and electromagnetic induction dual wireless earphone Download PDFInfo
- Publication number
- CN2177306Y CN2177306Y CN 93235895 CN93235895U CN2177306Y CN 2177306 Y CN2177306 Y CN 2177306Y CN 93235895 CN93235895 CN 93235895 CN 93235895 U CN93235895 U CN 93235895U CN 2177306 Y CN2177306 Y CN 2177306Y
- Authority
- CN
- China
- Prior art keywords
- receiving
- electromagnetic induction
- earphone
- audio
- wireless earphone
- 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
- Near-Field Transmission Systems (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
The utility model relates to an FM receiving and electromagnetic induction dual wireless earphone, which belongs to radio receiving devices. An audio induction coil L3 made of an enameled wire which is 0.05-0.1 mm and is wound by 800-1000 turns is added on the magnetic rod L1 of the original radio input circuit to receive audio induction signals. A transfer switch S1 is added to the input terminal of a low-frequency amplifier. If the transfer switch S1 is arranged at the point a, the utility model is an ordinary receiving earphone; if the transfer switch S1 is arranged at the point b and the audio induction signals on the coil L3 are added to the IC input terminal of the amplifier and the eighth feet of the IC through a potentiometer W and a coupling capacitor C11, the utility model is a wireless earphone for receiving the audio electromagnetic induction signals.
Description
The utility model belongs to radio system.
Normally used in the audio-visual education programme at present is Audio frequency radio earphone, and as the CN2105905U Audio frequency radio earphone, it is made up of inductance coil, amplifier and loud speaker, is a kind of single audio-visual education programme earphone, and utilance is lower.Also have a kind of Radio earphone now, as the CN2062527U Radio earphone, it is contained in amplitude-modulation receiver in the earphone, makes the earphone of listening to amplitude modulation broadcasting.If both combine, but broadcast listening at ordinary times can receive the audio-visual education programme content again in the electronic teaching.
The purpose of this utility model is to design a dual-purpose wireless headset that can receive amplitude modulation broadcasting signal and audio-electromagnetically induced signal.
Referring to Fig. 1, the utility model is to realize like this, be on the basis of amplitude-modulation receiver, to improve, be on former broadcast receiver input circuit bar magnet L1, to increase the frequency induction coil L3 that 0.05～0.1 millimeter enamelled wire of a usefulness is made around 800～1000 circles, receive the frequency induction signal, increase by a change over switch S1 at the low frequency amplifier input.It promptly is a common Radio earphone that S1 is placed on a place; S1 is placed on the b place, and the frequency induction signal on the coil L3 adds to amplifier IC input through potentiometer W, coupling capacitance C11, and IC the 8th pin promptly is a wireless headset that receives the audio-electromagnetically induced signal.
Referring to Fig. 2, main earphone base components and parts distribution schematic diagram.Components and parts are placed on the printed circuit board (1), and circuit board is fixed on the skeleton of base (2), and base side wall has elongated hole (3), are used to install volume adjustment knob (4).Referring to Fig. 3, Fig. 4, main earphone outline drawing also has circular hole, strip hole on the base, be used to install station selector (7) and change over switch S1.Mains switch S2 and battery are placed in the set of headphones base.
Referring to Fig. 5, earphone loam cake schematic diagram, loud speaker YD are fixed in the earphone loam cake (9).
In sum, the utility model amplitude modulation radio reception and electromagnetic induction dual-purpose wireless headset comprise earphone base (2), loam cake (9), amplitude-modulation receiver circuit board (1), volume adjustment knob (4), station selector (7), mains switch S2 and loud speaker YD, it is characterized in that also comprising change over switch S1 and on former bar magnet L1, increase a frequency induction coil L3, the end ground connection of L3, the other end connects the contact b of S1, and another contact a of S1 links to each other with detection output resistance R7; Changeover contact S1-1 links to each other with potentiometer W.
Claims (1)
1, amplitude modulation radio reception and electromagnetic induction dual-purpose wireless headset, comprise earphone base (2), loam cake (9), amplitude-modulation receiver circuit board (1), volume adjustment knob (4), station selector (7), mains switch S2 and loud speaker YD, it is characterized in that also comprising change over switch S1 and on former bar magnet L1, increase a frequency induction coil L3, the end ground connection of L3, the other end connects the contact b of S1, and another contact a of S1 links to each other with detection output resistance R7; Changeover contact S1-1 links to each other with potentiometer W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93235895 CN2177306Y (en) | 1993-12-29 | 1993-12-29 | FM receiving and electromagnetic induction dual wireless earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93235895 CN2177306Y (en) | 1993-12-29 | 1993-12-29 | FM receiving and electromagnetic induction dual wireless earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2177306Y true CN2177306Y (en) | 1994-09-14 |
Family
ID=33811209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93235895 Expired - Fee Related CN2177306Y (en) | 1993-12-29 | 1993-12-29 | FM receiving and electromagnetic induction dual wireless earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2177306Y (en) |
-
1993
- 1993-12-29 CN CN 93235895 patent/CN2177306Y/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2177306Y (en) | FM receiving and electromagnetic induction dual wireless earphone | |
| US3668334A (en) | Hearing aid with changeable battery cover containing rf pickup coil | |
| CN204967801U (en) | Antenna circuitry and mobile terminal | |
| CN210725147U (en) | Digital broadcast power amplifier with independent control | |
| CN2169960Y (en) | TV set induction receiver | |
| CN2241949Y (en) | Transmitter | |
| CN200983199Y (en) | Remote controller preventing from loss | |
| CN2406432Y (en) | Multifunction wireless microphone and earphone device | |
| CN2165576Y (en) | Wireless frequency modulating transmitter-receiver | |
| CN2535975Y (en) | Audio-frequency receiver | |
| CN219642377U (en) | Double Bluetooth wireless control device | |
| CN2319971Y (en) | TV set of using FM radio for receiving audio | |
| CN201409184Y (en) | Transmitting-receiving unit with function of television audio | |
| CN2135222Y (en) | Frequency-modulation stereo transmitter and radio active voice box | |
| CN2243143Y (en) | Integrated infrared frequency-modulation earphone | |
| CN2566558Y (en) | Wireless frequency-modulated accompanying sound telecontrol device | |
| CN2274395Y (en) | Radio receiver for stereo television set | |
| CN2070515U (en) | High-fidelity listen-distance adjustable device | |
| CN209105191U (en) | A kind of fixed frequency reception system of amplitude modulation | |
| CN2199645Y (en) | Multifunctional tourist explaining apparatus | |
| CN208479629U (en) | A kind of stereo transmission circuit of FM | |
| CN2574319Y (en) | Improved sound radio transmitting and receiving device for TV set | |
| CN2127215Y (en) | Infrared tv sound reciver | |
| CN2457796Y (en) | Radio transmission and receiving deivce special for teaching | |
| CN2473838Y (en) | Hand held telephone with radio receiver |
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 |