CN1152599C - Automatic switching switch of loudspeaker - Google Patents
Automatic switching switch of loudspeaker Download PDFInfo
- Publication number
- CN1152599C CN1152599C CNB991120396A CN99112039A CN1152599C CN 1152599 C CN1152599 C CN 1152599C CN B991120396 A CNB991120396 A CN B991120396A CN 99112039 A CN99112039 A CN 99112039A CN 1152599 C CN1152599 C CN 1152599C
- Authority
- CN
- China
- Prior art keywords
- resistance
- relay
- external
- loudspeaker
- external loudspeaker
- 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
- Amplifiers (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention 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 automatic switching switch comprises a switch switching element and a detection circuit of the external loudspeaker, wherein the input end of the switch switching element is connected with the output end of an audio power amplifier, one output end is connected with the internal loudspeaker, and the other output end is connected with a 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 present invention can switch automatically, and the failure rate is low.
Description
Technical field
The present invention relates 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.
Background technology
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.
Summary of the invention
The objective of the invention 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 object of the present invention is achieved like this, 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
End 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.
External Yang Sheng device 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 invention 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.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 2 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 invention 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 Yang Sheng device 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 2 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 invention 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 2 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.C1 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, it is connected in 1 end of X1 with the terminals of external loudspeaker Y3 or external earphone, and 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 present invention is owing to have the external loudspeaker testing circuit, it can detect external loudspeaker or external earphone inserts and leave two states, and send control signal to the switch switching device, 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 present invention has 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 present invention can avoid 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, the invention has the advantages that the switch contact that does not re-use 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 useful life of earphone jack, guaranteed the reliability of equipment.
Description of drawings
Embodiments of the present invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is a circuit block diagram of the present invention.
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
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.
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.Relay J adopts the miniature relay of dpdt double-pole double-throw (DPDT).The external loudspeaker testing circuit is by triode V1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, diode D2, and voltage stabilizing didoe D3 forms.
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:
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 as shown in figures 1 and 3.Television set comprises audio-frequency power amplifier, and it is divided into two sound channels.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 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, the binding post of external loudspeaker Y3 and Y4 is respectively X1 and X2, the Chang Kaiduan N.O1 of two contacts of the just very VCC. relay J of DC power supply 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 output capacitance C2 and C3 reverse charging that the anodal VCC of DC power supply gives 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.Voltage stabilizing didoe D3 connect as after, 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, and 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 connects loud speaker and is respectively Y1 and Y2 in two sound channels, 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, it is divided into two sound channels, 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 two outputs of another audio-frequency power amplifier are respectively B1 and the B2. present embodiment comprises switch switching device and external loudspeaker testing circuit.The components and parts of switch switching device and external loudspeaker testing circuit are formed identical with embodiment 3.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, 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 and N.C2 respectively with two in meet loud speaker Y1 and Y2 an end be connected, 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.O2,2 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, 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.
Among the embodiment 1,2,3 and 4, triode V1 adopts the 2SA1015. relay J to adopt 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 N.C1 of two contacts of relay J and N.C2 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 relay and external loudspeaker testing circuit, it is characterized in that, the common port of relay is connected with the output of audio-frequency power amplifier, the normally-closed contact end of relay with in connect loud speaker and be connected, the normally opened contact end 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 coil of relay; When the external loudspeaker testing circuit detected external loudspeaker or external earphone, the output control signal disconnected the relay normally-closed contact, and internal loudspeaker is quiet, and simultaneously, relay normally open contact is connected, and output signal is delivered on external loudspeaker or the external earphone; And after external loudspeaker or the dismounting of external earphone, testing circuit output control signal release relay is connected the relay normally-closed contact, recovers internal loudspeaker and connects.
2, automatic switching switch of loudspeaker according to claim 1 is characterized in that, 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 (R2) 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 is characterized in that, the external loudspeaker testing circuit comprises triode (V1), resistance (R1), resistance (R2), resistance (R3), electric capacity (C1), 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 (R2) 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.
4, automatic switching switch of loudspeaker according to claim 1 is characterized in that, the external loudspeaker testing circuit comprises triode (V1), resistance (R1), resistance (R2), resistance (R3), electric capacity (C1), 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), one end of collector electrode and resistance (R1) connects to be pressed, 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 (R2) and electric capacity (C1) all is connected with positive source (VCC), the positive pole of diode (D2) and triode V1) base stage be connected, 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 |
|---|---|---|---|
| CNB991120396A CN1152599C (en) | 1999-01-20 | 1999-01-20 | Automatic switching switch of loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991120396A CN1152599C (en) | 1999-01-20 | 1999-01-20 | Automatic switching switch of loudspeaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1261248A CN1261248A (en) | 2000-07-26 |
| CN1152599C true CN1152599C (en) | 2004-06-02 |
Family
ID=5275382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991120396A Expired - Fee Related CN1152599C (en) | 1999-01-20 | 1999-01-20 | Automatic switching switch of loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1152599C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346288C (en) * | 2004-10-20 | 2007-10-31 | 大竑企业股份有限公司 | Computer system with switching sound output and method for switching sound output |
| CN102045622B (en) * | 2009-10-16 | 2013-11-06 | 深圳Tcl新技术有限公司 | Method and device for switching built-in and external loud speakers |
| CN102238454B (en) * | 2010-04-23 | 2014-09-17 | 歌尔声学股份有限公司 | ECM (electret condenser microphone) switching circuit and method |
| CN102768558A (en) * | 2011-05-05 | 2012-11-07 | 鸿富锦精密工业（深圳）有限公司 | All-in-one computer having function of muting loudspeaker |
| CN104244140A (en) * | 2013-06-21 | 2014-12-24 | 深圳富泰宏精密工业有限公司 | Amplification device, portable electronic device and audio presentation module |
| CN103686011A (en) * | 2013-11-29 | 2014-03-26 | 乐视致新电子科技（天津）有限公司 | Television signal receiving module and method |
| CN105892982A (en) * | 2016-03-31 | 2016-08-24 | 乐视控股（北京）有限公司 | External loudspeaker switching method and device |
| CN107979795A (en) * | 2017-12-29 | 2018-05-01 | 数源科技股份有限公司 | The multiple sound resource audio switch that intelligently detecting switches |
-
1999
- 1999-01-20 CN CNB991120396A patent/CN1152599C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1261248A (en) | 2000-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9485580B1 (en) | Headset with microphone and wired remote control | |
| CN101610439B (en) | Electronic device | |
| CN1152599C (en) | Automatic switching switch of loudspeaker | |
| JP2006511053A5 (en) | ||
| CN1767378A (en) | Speaker driving device and audio output system | |
| CN1043287C (en) | Protection arrangement for audio output channel | |
| CN102480563A (en) | Control method and device in process of inserting earphone into earphone socket | |
| CN2367042Y (en) | Automatic changing-over switch for loudspeaker | |
| CN102457798A (en) | Audio switching circuit and audio playing device with same | |
| CN212799133U (en) | Elevator control circuit and elevator control system | |
| CN111314817A (en) | Switching control circuit, terminal equipment and switching control method | |
| CN107800853B (en) | Memory, mobile phone, audio circuit thereof and method for externally playing audio file | |
| JPH10155234A (en) | Power supply circuit for capacitor microphone | |
| CN102724756A (en) | Vehicle caller ID informing device for mobile phone | |
| CN208285492U (en) | A kind of earphone | |
| CN207995291U (en) | Set-top box and its interface multiplexing circuit | |
| 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 | |
| CN2606503Y (en) | Telephone recorder | |
| CN218449478U (en) | XLR microphone protection circuit | |
| CN204259121U (en) | The PCBA board of earphone and ear phone line control device | |
| CN213244340U (en) | Can draw device of equipment broadcast audio frequency through cell-phone headset socket | |
| CN2859965Y (en) | Audio commutation circuit | |
| CN216600050U (en) | Sound box protection circuit realized by discrete elements |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20040602 Termination date: 20110120 |