CN2367042Y - Automatic changing-over switch for loudspeaker - Google Patents
Automatic changing-over switch for loudspeaker Download PDFInfo
- Publication number
- CN2367042Y CN2367042Y CN 99219673 CN99219673U CN2367042Y CN 2367042 Y CN2367042 Y CN 2367042Y CN 99219673 CN99219673 CN 99219673 CN 99219673 U CN99219673 U CN 99219673U CN 2367042 Y CN2367042 Y CN 2367042Y
- Authority
- CN
- China
- Prior art keywords
- resistance
- relay
- external
- loudspeaker
- binding post
- 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
Abstract
The utility model relates to an automatic switching switch used between an internal loudspeaker and an external loudspeaker in audio and video equipment. In order to overcome the defects of troublesome operation and easy fault appearance by adopting a mechanical switch to switch, the utility model comprises a switch switching element and a detection circuit of the external loudspeaker. The input end of the switch switching element is connected with the output ends of an audio power amplifier. One output end is connected with the internal loudspeaker, and the other output end is connected with the wire connecting terminal of the external loudspeaker. The input end and the output end of the detection circuit of the external loudspeaker are respectively connected with the wire connecting terminal of the external loudspeaker and the control end of the switch switching element. The utility model can switch automatically and the failure rate is low.
Description
The utility model relate to a kind of be used for audio ﹠ video equipments such as television set, radio-cassette player, combination audio in connect automatic transfer switch between loud speaker and external loudspeaker or the external earphone.
All have audio-frequency power amplifier in the audio ﹠ video equipments such as existing television set, radio-cassette player, combination audio, connect loud speaker in driving by audio-frequency power amplifier and sound.At some in particular cases, these audio ﹠ video equipments need connect external loudspeaker or external earphone, in connect loud speaker and external loudspeaker or external earphone and can not work simultaneously.Connect between loud speaker and the external loudspeaker in the audio ﹠ video equipments such as present television set, radio-cassette player, combination audio generally is to adopt mechanical switch to switch.These mechanical switchs need manual operation, troublesome poeration.Itself breaks down mechanical switch easily, if switch improper or the external loudspeaker wiring improper, all might cause other fault of audio ﹠ video equipment.In connect between loud speaker and the external earphone the general earphone jack that adopts and switch, have switch contact in the earphone jack, during the switch contact loose contact, can cause after pulling up external earphone, in connect the not phenomenon of sounding of loud speaker.
The purpose of this utility model is, provide a kind of can be at the interior automatic switching switch of loudspeaker that automaticallyes switch between loud speaker and external loudspeaker or the external earphone that connects, it can reduce fault.
The purpose of this utility model is achieved in that automatic switching switch of loudspeaker, and it comprises switch switching device and external loudspeaker testing circuit.Its special character is, the input of switch switching device is connected with the output of audio-frequency power amplifier, output of switch switching device with in connect loud speaker and be connected, another output is connected with the binding post of external loudspeaker or external earphone; The input of external loudspeaker testing circuit is connected with the binding post of external loudspeaker or external earphone, and the output of external loudspeaker testing circuit is connected with the control end of switch switching device.
The external loudspeaker testing circuit is mainly used in detection and whether inserts external loudspeaker or external earphone, and sends control signal to the switch switching device.The switch switching device is controlled by the external loudspeaker testing circuit, when the external loudspeaker testing circuit detects access external loudspeaker or external earphone, just send control signal, make the switch switching device will in connect between the output of loud speaker and audio-frequency power amplifier and disconnect, connect between the output with the binding post of external loudspeaker or external earphone and audio-frequency power amplifier; When the external loudspeaker testing circuit detects external loudspeaker or the disengaging of external earphone, just send control signal, make between the output of switch switching device with the binding post of external loudspeaker or external earphone and audio-frequency power amplifier to disconnect, will connect between the interior output that connects loud speaker and audio-frequency power amplifier.
When the audio-frequency power amplifier of audio ﹠ video equipment adopts the OTL mode, switch switching device of the present utility model adopts relay J, and the external loudspeaker testing circuit comprises triode V1, resistance R 1, resistance R 2, resistance R 3, capacitor C 1, diode D2 and voltage stabilizing didoe D3; The common port COM1 of the contact of relay J is connected with the output terminals A of audio-frequency power amplifier, the normal-closed end N of contact, C1 with in meet loud speaker Y1 an end be connected, in connect the other end ground connection of loud speaker Y1, the Chang Kaiduan N.O1 of contact is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone, the 2 end ground connection of binding post X1; The emitter of triode V1 is connected with positive source VCC, collector electrode is connected with an end of resistance R 1, the other end of resistance R 1 is connected with the coil of relay J one end, the other end ground connection of the coil of relay J, sustained diode 1 is connected in parallel on the two ends of the coil of relay J, the base stage of triode V1 is connected with an end of resistance R 2 and capacitor C 1, the other end of resistance R 1 and capacitor C 1 all is connected with positive source VCC, the negative pole of voltage stabilizing didoe D3 is connected with the base stage of triode V1, the positive pole of voltage stabilizing didoe D3 is connected with the positive pole of diode D2, the negative pole of diode D2 is connected with an end of resistance R 3, and the other end of resistance R 3 is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone.
When the audio-frequency power amplifier of audio ﹠ video equipment adopted the OCL mode, switch switching device of the present utility model adopted relay J, and the external loudspeaker testing circuit comprises triode V1, resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and diode D2; The common port COM1 of the contact of relay J is connected with the output terminals A of audio-frequency power amplifier, the normal-closed end N.C1 of contact with in meet loud speaker Y1 an end be connected, in connect the other end ground connection of loud speaker Y1, the Chang Kaiduan N.O1 of contact is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone, the 2 end ground connection of binding post X1; The emitter of triode V1 is connected with positive source VCC, collector electrode is connected with an end of resistance R 1, the other end of resistance R 1 is connected with the coil of relay J one end, the other end ground connection of the coil of relay J, sustained diode 1 is connected in parallel on the two ends of the coil of relay J, the base stage of triode V1 is connected with an end of resistance R 2 and capacitor C 1, the other end of resistance R 1 and capacitor C 1 all is connected with positive source VCC, the positive pole of diode D2 is connected with the base stage of triode V1, the negative pole of diode D2 is connected with an end of resistance R 3, and the other end of resistance R 3 is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone.
When the audio-frequency power amplifier of audio ﹠ video equipment adopted the BTL mode, switch switching device of the present utility model adopted relay J, and the external loudspeaker testing circuit comprises triode V1, resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and diode D2; The common port COM1 of the contact of relay J is connected with an output terminals A 1 of audio-frequency power amplifier, the normal-closed end N.C1 of contact with in meet loud speaker Y1 an end be connected, in meet loud speaker Y1 the other end be connected with another output terminals A 2 of audio-frequency power amplifier, the Chang Kaiduan N.O1 of contact is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone, and 2 ends of binding post X1 are connected with the output terminals A 2 of audio-frequency power amplifier; The emitter of triode V1 is connected with positive source VCC, collector electrode is connected with an end of resistance R 1, the other end of resistance R 1 is connected with the coil of relay J one end, the other end ground connection of the coil of relay J, sustained diode 1 is connected in parallel on the two ends of the coil of relay J, the base stage of triode V1 is connected with an end of resistance R 2 and capacitor C 1, the other end of resistance R 1 and capacitor C 1 all is connected with positive source VCC, the positive pole of diode D2 is connected with the base stage of triode V1, the negative pole of diode D2 is connected with an end of resistance R 3, and the other end of resistance R 3 is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone.
When above-mentioned audio-frequency power amplifier adopted OTL, OCL and three kinds of modes of BTL, the common port COM1 of the contact of relay J was as the input of switch switching device, and it is connected with the output of audio-frequency power amplifier; The normal-closed end N.CI of the contact of relay J is as an output of switch switching device, it with in meet loud speaker Y1 an end be connected; The Chang Kaiduan N.O1 of the contact of relay J is as another output of switch switching device, and it is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone; The end that resistance R 3 is connected with 1 end of the binding post X1 of external loudspeaker Y3 or external earphone is as the input of external loudspeaker testing circuit; The end that resistance R 1 is connected with the coil of relay J is as the output of external loudspeaker testing circuit; The end that the coil of relay J is connected with resistance R 1 is as the control end of switch switching device.
The utility model is owing to have the external loudspeaker testing circuit, it can detect external loudspeaker or external earphone inserts and leave two states, and switch no part to switch and send control signal, by the switch switching device the output of audio-frequency power amplifier and in connect between the binding post of loud speaker and external loudspeaker or external earphone and automatically switch.With use mechanical switch to switch in the existing audio ﹠ video equipment to compare, the utility model has been realized automatic switchover, people are convenient in use, more comfortable.The life-span of switch switching device is longer than the life-span of mechanical switch, is difficult for breaking down.Connect in employing the utility model can be avoided and switch the improper or improper caused fault of external loudspeaker wiring between loud speaker and the external loudspeaker.With use in the existing audio ﹠ video equipment earphone jack interior connect to switch between loud speaker and the external earphone compare, advantage of the present utility model is not re-use the switch contact of earphone jack, avoided since the switch contact loose contact of earphone jack caused in connect the not fault of sounding of loud speaker, improve the physical life of earphone jack, guaranteed the reliability of equipment.
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is the circuit diagram of embodiment 1.
Fig. 3 is the circuit diagram of embodiment 2.
Fig. 4 is the circuit diagram of embodiment 3.
Fig. 5 is the circuit diagram of embodiment 4.
Embodiment 1:
As depicted in figs. 1 and 2, a kind of automatic transfer switch that is used for connecing in the radio-cassette player between loud speaker and the external earphone of present embodiment.Radio-cassette player comprises audio-frequency power amplifier, and it is divided into two sound channels, and the output of the audio-frequency power amplifier of two sound channels is respectively A and B.Two audio-frequency power amplifiers adopt the OTL mode, and their output terminals A and B have output capacitance C2 and C3 respectively.Present embodiment comprises switch switching device and external loudspeaker testing circuit.The switch switching device is made up of relay J and sustained diode 1, and relay J adopts the miniature relay of dpdt double-pole double-throw (DPDT).The external loudspeaker testing circuit is made up of triode V1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, diode D2 voltage stabilizing didoe D3.The just very VCC of DC power supply connects loud speaker and is respectively Y1 and Y2 in two sound channels, the binding post X1 of external earphone jack has 1 end, 2 ends, 3 ends, and wherein 1 end and 3 ends are distinguished the earphone of corresponding two sound channels, 2 end ground connection.The common port COM1 of two contacts of relay J is connected with B with the output terminals A of two audio-frequency power amplifiers respectively with COM2, the normal-closed end N.C1 of two contacts and N.C2 respectively with two in meet loud speaker Y1 and Y2 an end be connected, in connect the other end ground connection of loud speaker Y1 and Y2, the Chang Kaiduan N.O1 of two contacts is connected with 3 ends with 1 end of binding post X1 with R5 by resistance R 6 respectively with N.O2.One end of resistance R 3 and resistance R 4 all is connected with the negative pole of diode D2, and the other end of resistance R 3 and resistance R 4 is connected with 3 ends with 1 end of binding post X1 respectively.
Embodiment 2:
As shown in figures 1 and 3, a kind of automatic transfer switch that is used for connecing in the television set between loud speaker and the external loudspeaker of present embodiment.Television set comprises audio-frequency power amplifier, and it is divided into two sound channels, and the output of the audio-frequency power amplifier of two sound channels is respectively A and B.Two audio-frequency power amplifiers adopt the OTL mode, and the output terminals A and the B of its door have output capacitance C2 and C3 respectively.Present embodiment comprises switch switching device and external loudspeaker testing circuit.The switch switching device is made up of relay J and sustained diode 1, and relay J adopts the miniature relay of dpdt double-pole double-throw (DPDT).The external loudspeaker testing circuit is made up of triode V1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, diode D2 and voltage stabilizing didoe D3.Connect loud speaker in two sound channels and be respectively Y1 and Y2, the external loudspeaker of two sound channels is respectively Y3 and Y4, and the binding post of external loudspeaker Y3 and Y4 is respectively X1 and X2, the just very VCC of DC power supply.The Chang Kaiduan N.O1 of two contacts of relay J is connected the 2 end ground connection of 2 ends of binding post X1 and binding post X2 with 1 end of binding post X1 and 1 end of binding post X2 respectively with N.O2.One end of resistance R 3 and resistance R 4 is connected with the negative pole of diode D2, and the other end of resistance R 3 and resistance R 4 is connected with 1 end of binding post X1 and 1 end of binding post X2 respectively.The annexation of other components and parts of present embodiment is identical with embodiment 1.
In embodiment 1 and embodiment 2, resistance R 3, resistance R 4, diode D2, voltage stabilizing didoe D3 and capacitor C 1 are formed low pass filter, the base stage bias current of stablizing triode V1, and when making output dynamically than large-signal, bias current strengthens, and guarantees that the relay J contact is good.When external earphone or the charged disengaging of external loudspeaker Y3, Y4, because former Chang Kaiduan N.O1 and the N.O2 on-state that is in the contact of relay J, if there is not voltage stabilizing didoe D3, output capacitance C2 and C3 reverse charging that the anodal VCC of DC power supply gives the output of audio-frequency power amplifier by triode V1, diode D2, resistance R 3, resistance R 4 (also will pass through resistance R 5, resistance R 6 among the embodiment 1).When capacitor C 2 and C3 are in reverse bias, can there be leakage current.The contact that this leakage current may continue to keep relay J is in Chang Kaiduan N.O1 and N.O2 on-state, and meeting loud speaker Y1 and Y2 in making can't connect with the output terminals A and the B of audio-frequency power amplifier.After voltage stabilizing didoe D3 inserts, can reduce the anti-direct current degree partially of capacitor C 2 and C3, reduce leakage current, thereby guarantee that triode V1 breaks away from conducting state, relay J is resetted, the normal-closed end N.C1 of contact and N.C2 connect, in connect loud speaker Y1 and Y2 by automatically with the output terminals A and the B connection of audio-frequency power amplifier.
Embodiment 3:
As shown in Figure 1 and Figure 4, a kind of automatic transfer switch that is used for connecing in the combination audio between loud speaker and the external loudspeaker of present embodiment.Combination audio comprises audio-frequency power amplifier, and it is divided into two sound channels, and the output of the audio-frequency power amplifier of two sound channels is respectively A and B.Two audio-frequency power amplifiers adopt the OCL mode.Present embodiment comprises switch switching device and external loudspeaker testing circuit.The switch switching device is made up of relay J and sustained diode 1, and relay J adopts the miniature relay of dpdt double-pole double-throw (DPDT).The external loudspeaker testing circuit is made up of triode V1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1 and diode D2, the just very VCC of DC power supply, connect loud speaker in two sound channels and be respectively Y1 and Y2, the external loudspeaker of two sound channels is respectively Y3 and Y4, and the binding post of external loudspeaker Y3 and Y4 is respectively X1 and X2.The common port COM1 of two contacts of relay J is connected with B with the output terminals A of two audio-frequency power amplifiers respectively with COM2, the normal-closed end N.C1 of two contacts and N.C2 respectively with two in meet loud speaker Y1 and Y2 an end be connected, in connect the other end ground connection of loud speaker Y1 and Y2, the Chang Kaiduan N.O1 of two contacts is connected the 2 end ground connection of 2 ends of binding post X1 and binding post X2 with 1 end of binding post X1 and 1 end of binding post X2 respectively with N.O2.One end of resistance R 3 and resistance R 4 is connected with the negative pole of diode D2, and the other end of resistance R 3 and resistance R 4 is connected with 1 end of binding post X1 and 1 end of binding post X2 respectively.
Embodiment 4:
As Fig. 1 and shown in Figure 5, a kind of automatic transfer switch that is used for connecing in the combination audio between loud speaker and the external loudspeaker of present embodiment.Combination audio comprises audio-frequency power amplifier, and it is divided into two sound channels, and the audio-frequency power amplifier of two sound channels all adopts the BTL mode.Two outputs of an audio-frequency power amplifier are respectively A1 and A2, and another two outputs are respectively B1 and B2.Present embodiment comprises switch switching device and external loudspeaker testing circuit.It is identical with enforcement 3 that the components and parts of switch switching device and external loudspeaker testing circuit are formed.Connect loud speaker in two sound channels and be respectively Y1 and Y2, the external loudspeaker of two sound channels is respectively Y3 and Y4, and the binding post of external loudspeaker Y3 and Y4 is respectively X1 and X2, the just very VCC of DC power supply.The common port COM1 of two contacts of relay J is connected with B1 with the output terminals A 1 of two audio-frequency power amplifiers respectively with COM2, the normal-closed end N.C1 of two contacts is connected with an interior end that meets loud speaker Y1 and Y2 respectively with N.C2, in meet loud speaker Y1 and Y2 the other end be connected with B2 with the output terminals A 2 of two audio-frequency power amplifiers respectively, the Chang Kaiduan N.O1 of two contacts is connected with 1 end of binding post X1 and 1 end of binding post X2 respectively with N.O2, and 2 ends of binding post X1 are connected with B2 with the output terminals A 2 of two audio-frequency power amplifiers respectively with 2 ends of binding post X2.One end of resistance R 3 and resistance R 4 is connected with the negative pole of diode D2, and the other end of resistance R 3 and resistance R 4 is connected with 1 end of binding post X1 and 1 end of binding post X2 respectively.
Among embodiment 3 and the embodiment 4, because audio-frequency power amplifier adopts OCL and BTL mode respectively, their output does not have output capacitance, so saved voltage stabilizing didoe D3 in the external loudspeaker testing circuit.Resistance R 3, resistance R 4, diode D2 and capacitor C 1 are formed low pass filter, stablize the base stage of triode V1 and compile stream, and when making output dynamically than large-signal, bias current strengthens.Guarantee that the relay J contact is good.
Among the embodiment 1,2,3 and 4, triode V1 adopts 2SA1015.Relay J all adopts PANASONIC product TX2-12V relay, and it has two contacts, and all there are a common port COM, a normal-closed end N.C and a Chang Kaiduan N.O in each contact.When not inserting external loudspeaker Y3 and Y4 or external earphone, triode V1 ends, not adhesive of relay J, the normal-closed end NC1 of two contacts of relay J and NC2 closure, in meet loud speaker Y1 and Y2 and connect with two audio-frequency power amplifiers respectively.When inserting external loudspeaker Y3 and Y4 or external earphone, triode V1 saturation conduction, the relay J adhesive, the Chang Kaiduan N.O1 of two contacts of relay J and N.O2 closure, external loudspeaker Y3 and Y4 or external earphone are connected with two audio-frequency power amplifiers respectively.Simultaneously the normal-closed end N.C1 of two contacts of relay J and N.C2 disconnect, in meet loud speaker Y1 and Y2 and two audio-frequency power amplifiers disengagings.When external loudspeaker Y3 and Y4 or the disengaging of external earphone, triode V1 ends, and relay J resets, and the Chang Kaiduan N.O1 of two contacts of relay J and N.O2 disconnect, normal-closed end N.C1 and N.C2 closure, in meet loud speaker Y1 and Y2 and connect with two audio-frequency power amplifiers respectively.The resistance of resistance R 3 and resistance R 4 is bigger, and the direct current that flows through external loudspeaker Y3 and Y4 or external earphone very little (being lower than 0.5mA) is not so can impact the operating state of external loudspeaker Y3 and Y4 or external earphone.
Claims (4)
1, automatic switching switch of loudspeaker, it comprises switch switching device and external loudspeaker testing circuit, it is characterized in that, the input of switch switching device is connected with the output of audio-frequency power amplifier, output of switch switching device with in connect loud speaker and be connected, another output is connected with the binding post of external loudspeaker or external earphone; The input of external loudspeaker testing circuit is connected with the binding post of external loudspeaker or external earphone, and the output of external loudspeaker testing circuit is connected with the control end of switch switching device.
2, automatic switching switch of loudspeaker according to claim 1, it is characterized in that, the switch switching device adopts relay (J), and the external loudspeaker testing circuit comprises triode (V1), resistance (R1), resistance (R2), resistance (R3), electric capacity (C1), diode (D2) and voltage stabilizing didoe (D3); The common port (COM1) of the contact of relay (J) is connected with the output (A) of audio-frequency power amplifier, the normal-closed end of contact (N.C1) with in connect loud speaker (Y1) an end be connected, in connect the other end ground connection of loud speaker (Y1), the Chang Kaiduan of contact (N.O1) is connected with (1) end of the binding post (X1) of external loudspeaker (Y3) or external earphone, (2) end ground connection of binding post (X1); The emitter of triode (V1) is connected with positive source (VCC), collector electrode is connected with an end of resistance (R1), the other end of resistance (R1) is connected with coil one end of relay (J), the other end ground connection of the coil of relay (J), fly-wheel diode (D1) is connected in parallel on the two ends of the coil of relay (J), the base stage of triode (V1) is connected with the end of resistance (R2) with electric capacity (C1), the other end of resistance (R1) and electric capacity (C1) all is connected with positive source (VCC), the negative pole of voltage stabilizing didoe (D3) is connected with the base stage of triode (V1), the positive pole of voltage stabilizing didoe (D3) is connected with the positive pole of diode (D2), the negative pole of diode (D2) is connected with an end of resistance (R3), and the other end of resistance (R3) is connected with (1) end of the binding post (X1) of external loudspeaker (Y3) or external earphone.
3, automatic switching switch of loudspeaker according to claim 1, it is characterized in that, the switch switching device adopts relay (J), and the external loudspeaker testing circuit comprises triode (V1), resistance (R1), resistance (R2), resistance (R3), electric capacity (C1) and diode (D2); The common port (COM1) of the contact of relay (J) is connected with the output (A) of audio-frequency power amplifier, the normal-closed end of contact (N.C1) with in connect loud speaker (Y1) an end be connected, in connect the other end ground connection of loud speaker (Y1), the Chang Kaiduan of contact (N.O1) is connected with (1) end of the binding post (X1) of external loudspeaker (Y3) or external earphone, (2) end ground connection of binding post (X1); The emitter of triode (V1) is connected with positive source (VCC), collector electrode is connected with an end of resistance (R1), the other end of resistance (R1) is connected with coil one end of relay (J), the other end ground connection of the coil of relay (J), fly-wheel diode (D1) is connected in parallel on the two ends of the coil of relay (J), the base stage of triode (V1) is connected with the end of resistance (R2) with electric capacity (C1), the other end of resistance (R1) and electric capacity (C1) all is connected with positive source (VCC), the positive pole of diode (D2) is connected with the whole utmost point of triode (V1), the negative pole of diode (D2) is connected with an end of resistance (R3), and the other end of resistance (R3) is connected with (1) end of the binding post (X1) of external loudspeaker (Y3) or external earphone.
4, automatic switching switch of loudspeaker according to claim 1, it is characterized in that, the switch switching device adopts relay (J), and the external loudspeaker testing circuit comprises triode (V1), resistance (R1), resistance (R2), resistance (R3), electric capacity (C1) and diode (D2); The common port (COM1) of the contact of relay (J) is connected with an output (A1) of audio-frequency power amplifier, the normal-closed end of contact (N.C1) with in connect loud speaker (Y1) an end be connected, in connect loud speaker (Y1) the other end be connected with another output (A2) of audio-frequency power amplifier, the Chang Kaiduan of contact (N.O1) is connected with (1) end of the binding post (X1) of external loudspeaker (Y3) or external earphone, and (2) end of binding post (X1) is connected with the output (A2) of audio-frequency power amplifier; The emitter of triode (V1) is connected with positive source (VCC), collector electrode is connected with an end of resistance (R1), the other end of resistance (R1) is connected with coil one end of relay (J), the other end ground connection of the coil of relay (J), fly-wheel diode (D1) is connected in parallel on the two ends of the coil of relay (J), the base stage of triode (V1) is connected with the end of resistance (R2) with electric capacity (C1), the other end of resistance (R1) and electric capacity (C1) all is connected with positive source (VCC), the positive pole of diode (D2) is connected with the base stage of triode (V1), the negative pole of diode (D2) is connected with an end of resistance (R3), and the other end of resistance (R3) is connected with (1) end of the binding post (X1) of external loudspeaker (Y3) or external earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99219673 CN2367042Y (en) | 1999-01-20 | 1999-01-20 | Automatic changing-over switch for loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99219673 CN2367042Y (en) | 1999-01-20 | 1999-01-20 | Automatic changing-over switch for loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2367042Y true CN2367042Y (en) | 2000-03-01 |
Family
ID=34010551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99219673 Expired - Fee Related CN2367042Y (en) | 1999-01-20 | 1999-01-20 | Automatic changing-over switch for loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2367042Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7856109B2 (en) | 2005-02-03 | 2010-12-21 | Asustek Computer Inc. | Audio signal switching apparatus |
| CN102821337A (en) * | 2012-08-20 | 2012-12-12 | Tcl通力电子（惠州）有限公司 | Sound effect switching method and sound system |
| CN105892982A (en) * | 2016-03-31 | 2016-08-24 | 乐视控股（北京）有限公司 | External loudspeaker switching method and device |
| CN109951247A (en) * | 2018-12-29 | 2019-06-28 | 广州市源瑞信息科技有限公司 | A kind of train teller machines of input adaptive |
-
1999
- 1999-01-20 CN CN 99219673 patent/CN2367042Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7856109B2 (en) | 2005-02-03 | 2010-12-21 | Asustek Computer Inc. | Audio signal switching apparatus |
| CN102821337A (en) * | 2012-08-20 | 2012-12-12 | Tcl通力电子（惠州）有限公司 | Sound effect switching method and sound system |
| CN102821337B (en) * | 2012-08-20 | 2015-10-28 | Tcl通力电子（惠州）有限公司 | Sound effect switching method and sound system |
| CN105892982A (en) * | 2016-03-31 | 2016-08-24 | 乐视控股（北京）有限公司 | External loudspeaker switching method and device |
| WO2017166685A1 (en) * | 2016-03-31 | 2017-10-05 | 乐视控股（北京）有限公司 | Method and apparatus for switching to external loudspeaker |
| CN109951247A (en) * | 2018-12-29 | 2019-06-28 | 广州市源瑞信息科技有限公司 | A kind of train teller machines of input adaptive |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101610439B (en) | Electronic device | |
| CN106787025A (en) | Charge mode switching circuit and method | |
| CN103607676B (en) | A kind of wire-controlled apparatus for earphone and earphone | |
| CN1152599C (en) | Automatic switching switch of loudspeaker | |
| CN2367042Y (en) | Automatic changing-over switch for loudspeaker | |
| CN1043287C (en) | Protection arrangement for audio output channel | |
| CN111314817B (en) | Switching control circuit, terminal equipment and switching control method | |
| CN209358740U (en) | A kind of bluetooth headset reset control circuit | |
| CN107800853B (en) | Memory, mobile phone, audio circuit thereof and method for externally playing audio file | |
| CN200969673Y (en) | Earphone silent circuit and television set having the same | |
| CN207995291U (en) | Set-top box and its interface multiplexing circuit | |
| CN207766525U (en) | Sound equipment with power supply protection function | |
| CN208285492U (en) | A kind of earphone | |
| CN214481233U (en) | Audio circuit assembly and electronic equipment | |
| CN204259121U (en) | The PCBA board of earphone and ear phone line control device | |
| CN201270580Y (en) | Earphone mute circuit and television set with the same | |
| CN104640025B (en) | Mobile terminal and electronic equipment | |
| CN113596211B (en) | Earphone control circuit and terminal | |
| CN107343234B (en) | Intelligent earphone | |
| CN205335546U (en) | Earphone socket and display device | |
| CN109901062A (en) | A kind of circuit for realizing key detection by MCU controller | |
| CN104822110B (en) | A kind of Multi-audio-frequency channel control switching circuit and audio frequency apparatus | |
| CN201839270U (en) | Electronic switch module | |
| CN2859965Y (en) | Audio commutation circuit | |
| CN217563385U (en) | Dual-power supply control switching circuit |
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 |