CN204721597U - A kind of sound protection circuit - Google Patents
A kind of sound protection circuit Download PDFInfo
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- CN204721597U CN204721597U CN201520502448.3U CN201520502448U CN204721597U CN 204721597 U CN204721597 U CN 204721597U CN 201520502448 U CN201520502448 U CN 201520502448U CN 204721597 U CN204721597 U CN 204721597U
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Abstract
The utility model discloses a kind of sound protection circuit; comprise rectifier bridge T, resistance R1, triode V1 and chip IC 1; one end of described resistance R1 connects the contact J-1 of power amplifier P and relay J; the other end connecting sound equipment of the contact J-1 of relay J; the other end of resistance R1 connects the base stage of the port 2 of rectifier bridge T and the port one connecting triode V1 of electric capacity C1, rectifier bridge T.The utility model sound protection circuit structure is simple, components and parts are few; the operating state of midpoint potential Cleaning Principle to power amplifier is utilized to monitor; once it breaks down will disconnect the connection of itself and sound equipment; thus protection sound equipment is not damaged; and there is the function eliminating startup and shutdown impact noises, therefore have that cost of manufacture is low, diverse in function and a good advantage of protected effect.
Description
Technical field
The utility model relates to a kind of protective circuit, specifically a kind of sound protection circuit.
Background technology
Sound equipment is a kind of electro-acoustic transducer device, is commonly used in the electronic electric equipment of sounding.Sound equipment is a weak device in tone playing equipment; and be important parts for playback effect; protection for sound equipment is extremely important; the most complex structure of audio player protector in the market; volume is large, function singleness and cause cost higher; therefore the sound equipment of a lot of low and middle-end is not all equipped with protection module, thus causes sound equipment easily to damage, and makes troubles to user.
Utility model content
The purpose of this utility model is to provide that a kind of structure is simple, the sound protection circuit of energy-conserving and environment-protective, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of sound protection circuit, comprise rectifier bridge T, resistance R1, triode V1 and chip IC 1, one end of described resistance R1 connects the contact J-1 of power amplifier P and relay J, the other end connecting sound equipment of the contact J-1 of relay J, the other end of resistance R1 connects port 2 and the electric capacity C1 of rectifier bridge T, the base stage of the port one connecting triode V1 of rectifier bridge T, the other end contact resistance R3 of electric capacity C1, electric capacity C3, the emitter of triode V2, the port 3 of rectifier bridge T and the pin 1 of chip IC 1, the emitter of triode V1 connects the port 4 of rectifier bridge T, the collector electrode contact resistance R2 of triode V1 and the pin 4 of chip IC 1, the other end of resistance R2 connects electric capacity C2, the negative electrode of diode D1, relay J, the pin 8 of power supply VCC and chip IC 1, the other end of the other end contact resistance R3 of electric capacity C2, the pin 2 of chip IC 1 and the pin 6 of chip IC 1, the pin 5 of chip IC 1 connects the other end of electric capacity C3, the pin 3 contact resistance R4 of chip IC 1, the base stage of the other end connecting triode V2 of resistance R4, the collector electrode of triode V2 connects the anode of diode D1 and the other end of relay J.
As preferred version of the present utility model: the model of described chip IC 1 is NE555.
As preferred version of the present utility model: described relay J is normally-closed contact relay.
Compared with prior art; the beneficial effects of the utility model are: the utility model sound protection circuit structure is simple, components and parts are few; the operating state of midpoint potential Cleaning Principle to power amplifier is utilized to monitor; once it breaks down will disconnect the connection of itself and sound equipment; thus protection sound equipment is not damaged; and there is the function eliminating startup and shutdown impact noises, therefore have that cost of manufacture is low, diverse in function and a good advantage of protected effect.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of sound protection circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, a kind of sound protection circuit, comprise rectifier bridge T, resistance R1, triode V1 and chip IC 1, one end of described resistance R1 connects the contact J-1 of power amplifier P and relay J, the other end connecting sound equipment of the contact J-1 of relay J, the other end of resistance R1 connects port 2 and the electric capacity C1 of rectifier bridge T, the base stage of the port one connecting triode V1 of rectifier bridge T, the other end contact resistance R3 of electric capacity C1, electric capacity C3, the emitter of triode V2, the port 3 of rectifier bridge T and the pin 1 of chip IC 1, the emitter of triode V1 connects the port 4 of rectifier bridge T, the collector electrode contact resistance R2 of triode V1 and the pin 4 of chip IC 1, the other end of resistance R2 connects electric capacity C2, the negative electrode of diode D1, relay J, the pin 8 of power supply VCC and chip IC 1, the other end of the other end contact resistance R3 of electric capacity C2, the pin 2 of chip IC 1 and the pin 6 of chip IC 1, the pin 5 of chip IC 1 connects the other end of electric capacity C3, the pin 3 contact resistance R4 of chip IC 1, the base stage of the other end connecting triode V2 of resistance R4, the collector electrode of triode V2 connects the anode of diode D1 and the other end of relay J.
The model of chip IC 1 is NE555.Relay J is normally-closed contact relay.
Operation principle of the present utility model is: connecting the moment of sound equipment power supply, because electric capacity C2 both end voltage can not be suddenlyd change, can be considered short circuit, then 2 pin of chip IC 1 and 6 pin current potentials are higher than 2/3VCC, therefore chip IC 1 is in reset mode, its 3 pin output low level, transistor V2 ends, and relay J normally opened contact is failure to actuate.Power supply VCC is charged to electric capacity C3 by resistance R3 simultaneously, after time delay is about 5s, 2 pin of chip IC 1 and 6 pin potential drops are low to moderate 1/3VCC, chip IC 1 is triggered set, its 3 pin becomes high level from low level, transistor V2 conducting, relay J obtains electric, and normally-closed contact closes, thus achieve and postpone a period of time loud speaker is accessed power amplifier, when completely eliminating start, big current is to the impact of loud speaker.When closing sound equipment, voltage disappears very soon, but power amplifier output signal does not disappear immediately, avoids the impact noise that shutdown process produces equally.When causing midpoint potential too high when power amplifier operation irregularity or accidental damage, direct voltage, through R1 current limliting, delivers to C1 filtering and rectifier bridge T rectification; about 1 ~ 2s; triode V1 conducting, 4 pin of chip IC 1 are by high level step-down level, and chip IC 1 is reset; 3 pin output low levels; triode V2 ends, relay J dead electricity, and normally opened contact J-1 disconnects; sound equipment and power amplifier are disconnected, effectively protects sound equipment and be not damaged.
Claims (3)
1. a sound protection circuit, comprise rectifier bridge T, resistance R1, triode V1 and chip IC 1, it is characterized in that, one end of described resistance R1 connects the contact J-1 of power amplifier P and relay J, the other end connecting sound equipment of the contact J-1 of relay J, the other end of resistance R1 connects port 2 and the electric capacity C1 of rectifier bridge T, the base stage of the port one connecting triode V1 of rectifier bridge T, the other end contact resistance R3 of electric capacity C1, electric capacity C3, the emitter of triode V2, the port 3 of rectifier bridge T and the pin 1 of chip IC 1, the emitter of triode V1 connects the port 4 of rectifier bridge T, the collector electrode contact resistance R2 of triode V1 and the pin 4 of chip IC 1, the other end of resistance R2 connects electric capacity C2, the negative electrode of diode D1, relay J, the pin 8 of power supply VCC and chip IC 1, the other end of the other end contact resistance R3 of electric capacity C2, the pin 2 of chip IC 1 and the pin 6 of chip IC 1, the pin 5 of chip IC 1 connects the other end of electric capacity C3, the pin 3 contact resistance R4 of chip IC 1, the base stage of the other end connecting triode V2 of resistance R4, the collector electrode of triode V2 connects the anode of diode D1 and the other end of relay J.
2. a kind of sound protection circuit according to claim 1, is characterized in that, the model of described chip IC 1 is NE555.
3. a kind of sound protection circuit according to claim 1, is characterized in that, described relay J is normally-closed contact relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520502448.3U CN204721597U (en) | 2015-07-14 | 2015-07-14 | A kind of sound protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520502448.3U CN204721597U (en) | 2015-07-14 | 2015-07-14 | A kind of sound protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204721597U true CN204721597U (en) | 2015-10-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520502448.3U Expired - Fee Related CN204721597U (en) | 2015-07-14 | 2015-07-14 | A kind of sound protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204721597U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN107706899A (en) * | 2017-11-12 | 2018-02-16 | 苏州普罗森美电子科技有限公司 | New-energy automobile sound protection circuit |
-
2015
- 2015-07-14 CN CN201520502448.3U patent/CN204721597U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN107706899A (en) * | 2017-11-12 | 2018-02-16 | 苏州普罗森美电子科技有限公司 | New-energy automobile sound protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20160714 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |