CN104796093B - A kind of broadcasting power amplifies protective device - Google Patents
A kind of broadcasting power amplifies protective device Download PDFInfo
- Publication number
- CN104796093B CN104796093B CN201510151427.6A CN201510151427A CN104796093B CN 104796093 B CN104796093 B CN 104796093B CN 201510151427 A CN201510151427 A CN 201510151427A CN 104796093 B CN104796093 B CN 104796093B
- Authority
- CN
- China
- Prior art keywords
- resistance
- triode
- delay circuit
- power
- circuit
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The present invention proposes a kind of broadcasting power amplification protective device; including preposition see-saw circuit, power amplification circuit, power-on protection delay circuit and volume gradually big delay circuit; the power amplification circuit is connected with the preposition see-saw circuit and power-on protection delay circuit respectively; also gradually big delay circuit is connected the power-on protection delay circuit with the preposition see-saw circuit and volume respectively, the volume gradually big delay circuit be also connected with the preposition see-saw circuit, for making to start shooting every time or restarting machine when volume become larger.Implement the broadcasting power amplification protective device of the present invention, have the advantages that：It is not easy to allow people to get a fright when being avoided that larger current impact, extending machine life, start.
Description
Technical field
The present invention relates to broadcast world, more particularly to a kind of broadcasting power amplification protective device.
Background technology
At present, broadcasting power amplifier booting moment volume is larger, and impact of the such case to speaker is very big, and here it is right
Transistor and protector have larger rush of current, and loss that thus can be to transistor and protector is very big, causes to shorten
Machine life.In addition, if people play music suddenly under conditions of actual conditions are not known, often scaring arrives others,
Easily everybody is allowed to get a fright.
The content of the invention
The technical problem to be solved in the present invention is that above-mentioned for the prior art has larger current impact, shortening complete machine
The defects of easily allowing people to get a fright when service life, start, there is provided one kind is avoided that larger current impact, extends machine life, opens
It is not easy the broadcasting power amplification protective device for allowing people to get a fright during machine.
The technical solution adopted by the present invention to solve the technical problems is：A kind of broadcasting power amplification protective device is constructed,
Including preposition see-saw circuit, power amplification circuit, power-on protection delay circuit and volume gradually big delay circuit, the power
Amplifying circuit is connected with the preposition see-saw circuit and power-on protection delay circuit respectively, the power-on protection delay circuit
Also gradually big delay circuit is connected with the preposition see-saw circuit and volume respectively, the volume gradually big delay circuit also with institute
State the connection of preposition see-saw circuit, for making to start shooting every time or restarting machine when volume become larger.
In broadcasting power of the present invention amplifies protective device, gradually big delay circuit includes the 47th to the volume
Triode, the 15th resistance, the 7th resistance, the 153rd resistance, the 7th capacitance, the 77th resistance, the 26th
Pole pipe, the 31st triode, the 72nd resistance, the 71st resistance, the 14th triode, the 76th resistance, the tenth
Five triodes, the 125th resistance, the 128th resistance, the 130th resistance, the 6th diode, optocoupler and
One power supply, the optocoupler include LED and light-receiving device, base stage and the power-on protection delay circuit of the 47th triode
Connection, the collector of the 47th triode by the 15th resistance respectively with one end of the 7th capacitance and the
One end connection of seven resistance, the other end of the 7th resistance are connected with the base stage of the 26th triode, and the described 7th
The other end of resistance is also connected by the 153rd resistance with first power supply, the 26th triode
Emitter is connected by the 77th resistance with first power supply, the emitter of the 26th triode also with institute
State the base stage connection of the 14th triode, the emitter of the 14th triode passes through the 71st resistance and described the
One power supply connects, and the collector of the 14th triode passes through the 72nd resistance and the 31st triode
Base stage connects, and the collector of the 14th triode also passes through the 76th resistance and the base of the 15th triode
Pole connects, and the collector of the 15th triode passes sequentially through the LED and the 125th resistance and the described first electricity
Source connects, and first power supply also passes sequentially through the 128th resistance and the 6th diode and the 15th pole
The base stage connection of pipe, first power supply also pass sequentially through the 128th resistance and the 130th resistance eutral grounding,
The light-receiving device is connected with the preposition see-saw circuit.
In broadcasting power of the present invention amplifies protective device, gradually big delay circuit further includes the 100th to the volume
31 resistance, the 131st resistance one end ground connection, the other end of the 131st resistance with it is described
The base stage connection of 15th triode, the other end of the 131st resistance also connect with the cathode of the 6th diode
Connect, the anode of the 6th diode is connected by the 128th resistance with first power supply.
In broadcasting power of the present invention amplifies protective device, gradually big delay circuit further includes the 30th to the volume
Four capacitances, the 27th resistance and the 42nd capacitance, the base stage of the 15th triode also pass through the described 34th electricity
Hold ground connection, the base stage of the 15th triode also passes sequentially through the 27th resistance and the 42nd capacity earth.
In broadcasting power of the present invention amplifies protective device, gradually big delay circuit further includes the 70th to the volume
Three resistance and the 75th resistance, the collector of the 31st triode are connected with the 75th resistance, and described
The base stage of 31 triodes also passes through the 73rd resistance eutral grounding.
In broadcasting power of the present invention amplifies protective device, gradually big delay circuit further includes the 100th to the volume
81 resistance, the emitter of the 47th triode are prolonged by the 181st resistance with the power-on protection
When circuit connect.
In broadcasting power of the present invention amplifies protective device, the preposition see-saw circuit includes anti-phase amplification
Device, the 8th resistance, the 11st resistance, the 20th resistance, the first capacitance, the 12nd capacitance and the 15th resistance, it is described anti-phase to put
The inverting input of big device is connected by the 11st resistance with one end of the light-receiving device, the inverting amplifier it is in the same direction
Input terminal is connected by the 8th resistance with the other end of the light-receiving device, and the 20th resistance and the first capacitance are in parallel,
One end in parallel is connected with the noninverting input of the inverting amplifier, the output of the other end in parallel and the inverting amplifier
End connection, the output terminal of the inverting amplifier also pass sequentially through the 12nd capacitance and the 15th resistance and are put with the power
Big circuit connection.
In broadcasting power of the present invention amplifies protective device, the preposition see-saw circuit further includes the tenth electricity
Resistance, the 28th resistance and the 11st capacitance, the inverting amplifier also pass through the tenth resistance eutral grounding, the anti-phase amplification
The in-phase input end of device also passes sequentially through the 8th resistance and the 28th resistance eutral grounding, the inverting amplifier it is same mutually defeated
Enter end and also pass sequentially through the 8th resistance and the 11st capacitance connection signal input point.
In broadcasting power of the present invention amplifies protective device, the power-on protection delay circuit includes the 104th
19 resistance, the 8th diode, the 9th diode, the 45th triode, the 46th triode and second source, described
The collector of 45 triodes is connected by the 9th diode with the second source, the 45th triode
The base stage that collector also passes sequentially through the 149th resistance and the 8th diode and the 47th triode connects
Connecing, the collector of the collector of the 45th triode also with the 46th triode is connected, and the described 45th
The emitter of triode is connected with the base stage of the 46th triode.
In broadcasting power of the present invention amplifies protective device, the 47th triode, the 31st pole
Pipe, the 15th triode, the 45th triode and the 46th triode are NPN triode, the 26th pole
Pipe and the 14th triode are PNP triode.
Implement the broadcasting power amplification protective device of the present invention, have the advantages that：Anti-phase put due to the use of preposition
Big circuit, power amplification circuit, power-on protection delay circuit and volume gradually big delay circuit, gradually big delay circuit is used to make volume
Volume becomes larger when starting shooting every time or restart machine, thus can be to avoid larger rush of current, so it can extend
It is not easy to allow people to get a fright when machine life, start.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure diagram in broadcasting power of the present invention amplification protective device one embodiment.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
In broadcasting power of the present invention amplifies protective device embodiment, its broadcasting power amplifies the structural representation of protective device
Figure is as shown in Figure 1.In Fig. 1, the broadcasting power amplification protective device include preposition see-saw circuit 1, power amplification circuit 2,
Power-on protection delay circuit 3 and volume gradually big delay circuit 4, power amplification circuit 2 is respectively with preposition see-saw circuit 1 and opening
Machine protection delay circuit 3 connect, power-on protection delay circuit 3 also respectively with the gradually big delay of preposition see-saw circuit 1 and volume
Circuit 4 connects, and gradually big delay circuit 4 is also connected, for making machine of starting shooting or restart every time volume with preposition see-saw circuit 1
Shi Yinliang becomes larger.Thus can be to avoid larger rush of current, so it does not allow when can extend machine life, start
Easily people is allowed to get a fright.
In the present embodiment, gradually big delay circuit includes the 47th triode Q47, the 15th resistance R15, the 7th electricity to volume
Hinder R7, the 153rd resistance R153, the 7th capacitance C7, the 77th resistance R77, the 26th triode Q26, the 30th
One triode Q31, the 72nd resistance R72, the 71st resistance R71, the 14th triode Q14, the 76th resistance R76,
15th triode Q15, the 125th resistance R125, the 128th resistance R128, the 130th resistance R130,
6th diode D6, optocoupler PC1 and the first power supply VCC, optocoupler PC1 include LED and light-receiving device, the 47th triode Q47's
Base stage is connected with power-on protection delay circuit 3, the collector of the 47th triode Q47 by the 15th resistance R15 respectively with
One end of 7th capacitance C7 is connected with one end of the 7th resistance R7, the other end and the 26th triode Q26 of the 7th resistance R7
Base stage connection, the other end of the 7th resistance R7 is also connected by the 153rd resistance R153 with the first power supply VCC, second
The emitter of 16 triode Q26 is connected by the 77th resistance R77 with the first power supply VCC, the 26th triode Q26's
Base stage of the emitter also with the 14th triode Q14 is connected, and the emitter of the 14th triode Q14 passes through the 71st resistance
R71 is connected with the first power supply VCC, and the collector of the 14th triode Q14 passes through the 72nd resistance R72 and the 31st pole
The base stage connection of pipe Q31, the collector of the 14th triode Q14 also pass through the 76th resistance R76 and the 15th triode Q15
Base stage connection, the collector of the 15th triode Q15 passes sequentially through LED and the 125th resistance R125 and the first power supply
VCC connections, the first power supply VCC also pass sequentially through the 128th resistance R128 and the 6th diode D6 and the 15th triode
The base stage connection of Q15, the first power supply VCC also passes sequentially through the 128th resistance R128 and the 130th resistance R130 connects
Ground, light-receiving device are connected with preposition see-saw circuit 1.
In the present embodiment, gradually big delay circuit 4 further includes the 131st resistance R131, the 131st electricity to volume
One end ground connection of R131 is hindered, the other end of the 131st resistance R131 is connected with the base stage of the 15th triode Q15, and first
Cathode of the other end of 131 resistance R131 also with the 6th diode D6 is connected, and the anode of the 6th diode D6 passes through first
128 resistance R128 are connected with the first power supply VCC.
In the present embodiment, gradually big delay circuit 4 further includes the 34th capacitance C34, the 27th resistance R27 and to volume
The base stage of 42 capacitance C42, the 15th triode Q15 is also grounded by the 34th capacitance C34, the 15th triode Q15
Base stage also pass sequentially through the 27th resistance R27 and the 42nd capacitance C42 ground connection.
In the present embodiment, gradually big delay circuit further includes the 73rd resistance R73 and the 75th resistance R75 to volume, the
The collector of 31 triode Q31 is connected with the 75th resistance R75, and the base stage of the 31st triode Q31 also passes through
73 resistance R73 are grounded.In the present embodiment, gradually big delay circuit 4 further includes the 181st resistance R181 to volume, and the 4th
The emitter of 17 triode Q47 is connected by the 181st resistance R181 with power-on protection delay circuit 3.
In the present embodiment, preposition see-saw circuit 1 includes inverting amplifier U3, the 8th resistance R8, the 11st resistance
R11, the 20th resistance R20, the first capacitance C1, the 12nd capacitance C12 and the 15th resistance R15, inverting amplifier U3's is anti-phase
Input terminal is connected by one end of the 11st resistance R11 and light-receiving device, and the noninverting input of inverting amplifier U3 passes through the 8th electricity
The other end for hindering R8 and light-receiving device connects, and the 20th resistance R20 and the first capacitance C1 are in parallel, one end in parallel and inverting amplifier
The noninverting input connection of U3, the other end in parallel are connected with the output terminal of inverting amplifier U3, the output of inverting amplifier U3
End also passes sequentially through the 12nd capacitance C12 and the 15th resistance R15 is connected with power amplification circuit 2.
In the present embodiment, preposition see-saw circuit 1 further includes the tenth resistance R10, the 28th resistance R28 and the 11st
Capacitance C11, inverting amplifier U3 are also grounded by the tenth resistance R10, and the in-phase input end of inverting amplifier U3 also passes sequentially through
8th resistance R8 and the 28th resistance R28 ground connection, the in-phase input end of inverting amplifier U3 also pass sequentially through the 8th resistance R8
Signal input point A1 is connected with the 11st capacitance C11.
In the present embodiment, power-on protection delay circuit 3 includes the 149th resistance R149, the 8th diode D8, the
Nine diode D9, the 45th triode Q45, the 46th triode Q46 and second source VDD, the 45th triode Q45
Collector be connected by the 9th diode D9 with second source VDD, the collector of the 45th triode Q45 also passes sequentially through
149th resistance R149 and the 8th diode D8 are connected with the base stage of the 47th triode Q47, the 45th pole
Collector of the collector of pipe Q45 also with the 46th triode Q46 is connected, the emitter of the 45th triode Q45 and
The base stage connection of 46 triode Q46.
It is noted that in the present embodiment, the 47th triode Q47, the 31st triode Q31, the 15th
Pole pipe Q15, the 45th triode Q45 and the 46th triode Q46 are NPN triode, the 26th triode Q26 and
14th triode Q14 is PNP triode.
In the present embodiment, when machine is started shooting or restarted every time, the level of signal input point A1 is very high (being approximately equal to 24V)；
As level >=1.4V of signal input point A1, then after the 149th resistance R149 and the 8th diode D8 successively,
The base level of 47th triode Q47 is 0.7V, then the 47th triode Q47 is turned on, as the 47th triode Q47
During work, when the emitter voltage of the 26th triode Q26 is higher than its base voltage 0.7V, then the 26th triode Q26
Turn on therewith, when the 26th triode Q26 is on working status, the emitter voltage of the 14th triode Q14 is high
When its base voltage 0.7V, then the 14th triode Q14 is turned on；When the 14th triode Q14 is turned on, the 15th triode
The base stage of Q15 is high level, is at this time conducting state, and electric current is through the 125th resistance when the 15th triode Q15 is turned on
R125 flows to optocoupler PC1, realizes that control is anti-by optocoupler PC1, inverting amplifier U3, the tenth resistance R10 and the 11st resistance R11
The in-phase input end of phase amplifier U3 signal input, when inverting amplifier U3 in-phase input end signal magnitude control be with
During the same size of the signal of its inverting input, the output terminal no signal output of inverting amplifier U3, then 2 nothing of power amplification circuit
Output.
After each machine is started shooting 5-6 seconds, the level of signal input point A1 can drop to 0.7V, when signal input point A1's
When level is less than 1.4V, the 47th triode Q47 is not turned on, and the 47th triode Q47 of 5-6 seconds is conducting shape before start
State, also discharges while the 47th triode Q47 is turned on to the 7th capacitance C7, after several seconds of start, the 4th
17 triode Q47 are cut-off state, and the 7th capacitance C7 is carried out slowly by the 153rd resistance R153 and the 7th resistance R7
Charging, in charging process, the 26th triode Q26 is on situation, and the 7th capacitance C7 charges and finishes after two seconds, then
26th triode Q26 is slowly switched to saturation cut-off state by conducting state, when the 26th triode Q26 ends, the
14 triode Q14 are also cut-off, and when the 14th triode Q14 ends, the 15th triode Q15 is also cut-off, the 15th
When pole pipe Q15 ends, optocoupler PC1 no currents are by the way that optocoupler PC1 does not work at this time, in the case of optocoupler PC1 is idle, instead
The signal magnitude and the signal magnitude of its inverting input of the in-phase input end of phase amplifier U3 are different, then inverting amplifier
U3U3 exports for anti-phase amplification, volume gradually big function when thereby realizing each start.
In short, in the present embodiment, after improvement, volume is gradually big when starting shooting every time or restarting machine, by small-signal
Big signal is slowly upgraded to, will not thus everybody is easily got a fright, while it also avoid to the big of transistor and protector
Rush of current, so as to effectively extend machine life.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (9)
1. a kind of broadcasting power amplifies protective device, it is characterised in that including preposition see-saw circuit, power amplification circuit,
Power-on protection delay circuit and volume gradually big delay circuit, the power amplification circuit respectively with the preposition see-saw circuit
Connected with power-on protection delay circuit, the power-on protection delay circuit also respectively with the preposition see-saw circuit and volume
Gradually big delay circuit connection, gradually big delay circuit is also connected, for making every time the volume with the preposition see-saw circuit
Volume becomes larger when starting shooting or restarting machine；
Gradually big delay circuit includes the 47th triode, the 15th resistance, the 7th resistance, the 153rd electricity to the volume
Resistance, the 7th capacitance, the 77th resistance, the 26th triode, the 31st triode, the 72nd resistance, the 71st
Resistance, the 14th triode, the 76th resistance, the 15th triode, the 125th resistance, the 128th electricity
Resistance, the 130th resistance, the 6th diode, optocoupler and the first power supply, the optocoupler include LED and light-receiving device, and the described 4th
The base stage of 17 triodes is connected with the power-on protection delay circuit, and the collector of the 47th triode passes through described
15th resistance is connected with one end of the 7th capacitance and one end of the 7th resistance respectively, the other end of the 7th resistance with
The base stage connection of 26th triode, the other end of the 7th resistance also by the 153rd resistance with
The first power supply connection, the emitter of the 26th triode pass through the 77th resistance and first power supply
Connection, the base stage of the emitter of the 26th triode also with the 14th triode are connected, the 14th pole
The emitter of pipe is connected by the 71st resistance with first power supply, and the collector of the 14th triode passes through
72nd resistance is connected with the base stage of the 31st triode, and the collector of the 14th triode also passes through
76th resistance is connected with the base stage of the 15th triode, and the collector of the 15th triode passes sequentially through
The LED and the 125th resistance are connected with first power supply, and first power supply also passes sequentially through the described 100th
28 resistance and the 6th diode are connected with the base stage of the 15th triode, and first power supply also passes sequentially through described
128th resistance and the 130th resistance eutral grounding, the light-receiving device are connected with the preposition see-saw circuit.
2. broadcasting power according to claim 1 amplifies protective device, it is characterised in that the volume gradually big delay circuit
The 131st resistance is further included, one end of the 131st resistance is grounded, the 131st resistance
The other end is connected with the base stage of the 15th triode, and the other end of the 131st resistance is also with the described 6th 2
The cathode connection of pole pipe, the anode of the 6th diode are connected by the 128th resistance and first power supply
Connect.
3. broadcasting power according to claim 2 amplifies protective device, it is characterised in that the volume gradually big delay circuit
The 34th capacitance, the 27th resistance and the 42nd capacitance are further included, the base stage of the 15th triode also passes through institute
The 34th capacity earth is stated, the base stage of the 15th triode also passes sequentially through the 27th resistance and the 42nd
Capacity earth.
4. broadcasting power according to claim 3 amplifies protective device, it is characterised in that the volume gradually big delay circuit
Further include the 73rd resistance and the 75th resistance, collector and the 75th resistance of the 31st triode
Connection, the base stage of the 31st triode also pass through the 73rd resistance eutral grounding.
5. broadcasting power according to claim 4 amplifies protective device, it is characterised in that the volume gradually big delay circuit
The 181st resistance is further included, the emitter of the 47th triode passes through the 181st resistance and institute
State the connection of power-on protection delay circuit.
6. the broadcasting power amplification protective device according to claim 1 to 5 any one, it is characterised in that described preposition
See-saw circuit includes inverting amplifier, the 8th resistance, the 11st resistance, the 20th resistance, the first capacitance, the 12nd capacitance
With the 15th resistance, the inverting input of the inverting amplifier is connected by one end of the 11st resistance and the light-receiving device
Connecing, the noninverting input of the inverting amplifier is connected by the 8th resistance with the other end of the light-receiving device, and described
20 resistance and the first capacitance are in parallel, and one end in parallel is connected with the noninverting input of the inverting amplifier, and in parallel is another
End is connected with the output terminal of the inverting amplifier, and the output terminal of the inverting amplifier also passes sequentially through the 12nd capacitance
It is connected with the 15th resistance with the power amplification circuit.
7. broadcasting power according to claim 6 amplifies protective device, it is characterised in that the preposition see-saw circuit
Further include the tenth resistance, the 28th resistance and the 11st capacitance, the inverting amplifier also by the tenth resistance eutral grounding,
The in-phase input end of the inverting amplifier also passes sequentially through the 8th resistance and the 28th resistance eutral grounding, described anti-phase to put
The in-phase input end of big device also passes sequentially through the 8th resistance and the 11st capacitance connection signal input point.
8. the broadcasting power amplification protective device according to claim 1 to 5 any one, it is characterised in that the start
Delay circuit is protected to include the 149th resistance, the 8th diode, the 9th diode, the 45th triode, the 40th
Six triodes and second source, the collector of the 45th triode pass through the 9th diode and the second source
Connection, the collector of the 45th triode also pass sequentially through the 149th resistance and the 8th diode and institute
State the base stage connection of the 47th triode, the collector of the 45th triode also with the 46th triode
Collector connects, and the emitter of the 45th triode is connected with the base stage of the 46th triode.
9. broadcasting power according to claim 8 amplifies protective device, it is characterised in that the 47th triode,
31st triode, the 15th triode, the 45th triode and the 46th triode are NPN triode, described
26th triode and the 14th triode are PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510151427.6A CN104796093B (en) | 2015-03-31 | 2015-03-31 | A kind of broadcasting power amplifies protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510151427.6A CN104796093B (en) | 2015-03-31 | 2015-03-31 | A kind of broadcasting power amplifies protective device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104796093A CN104796093A (en) | 2015-07-22 |
| CN104796093B true CN104796093B (en) | 2018-04-13 |
Family
ID=53560659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510151427.6A Active CN104796093B (en) | 2015-03-31 | 2015-03-31 | A kind of broadcasting power amplifies protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104796093B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87205606U (en) * | 1987-03-26 | 1988-05-04 | 中国人民解放军重庆通信学院 | Audiofrequency power amplifier with fet elements |
| CN2119727U (en) * | 1991-10-17 | 1992-10-21 | 李铁铮 | Transmitter for network fm broadcast |
| CN2134765Y (en) * | 1992-08-27 | 1993-05-26 | 上海新亚无线电厂 | Protecting means for overload short circuit and reverse of large power megaphone |
| CN2178967Y (en) * | 1993-09-30 | 1994-10-05 | 冯少军 | Gradually ringing device for telephone bell |
| CN2355497Y (en) * | 1998-02-18 | 1999-12-22 | 徐耀忠 | High reliability power amplifier |
| JP3896894B2 (en) * | 2002-05-13 | 2007-03-22 | ソニー株式会社 | Power amplifier |
| CN204652313U (en) * | 2015-03-31 | 2015-09-16 | 广州市番禺区西派电子电器厂（普通合伙） | A kind of broadcasting power amplifies protective device |
-
2015
- 2015-03-31 CN CN201510151427.6A patent/CN104796093B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104796093A (en) | 2015-07-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102761110B (en) | Power supply delay circuit | |
| CN104796093B (en) | A kind of broadcasting power amplifies protective device | |
| CN105423339B (en) | Pulse firing controls circuit and gas-cooker | |
| CN110350902A (en) | A kind of Anti-misoperation circuit and anti-misoperation apparatus | |
| CN101582681A (en) | Power amplifying circuit for eliminating turn-off noise | |
| CN209516926U (en) | A kind of soft startup of electric power protection circuit | |
| CN205584006U (en) | Prevent surge circuit, switching power supply and display device | |
| CN204652313U (en) | A kind of broadcasting power amplifies protective device | |
| CN206878798U (en) | A kind of Darlington transistor drive circuit | |
| CN202550940U (en) | Motor soft starting device | |
| CN204517782U (en) | A kind of switching circuit and there is the terminal of this circuit | |
| CN105262548A (en) | Light receiving circuit | |
| CN209930225U (en) | MOS tube driving circuit | |
| CN106253885B (en) | Power-on protection circuit and control method | |
| CN210608514U (en) | Plc power supply overvoltage protection device | |
| CN110265261A (en) | A kind of carrier state keeps the relay drive circuit of function | |
| CN110290446A (en) | A kind of high-speed switch machine prevents the mute circuit of sonic boom | |
| CN103914096B (en) | A kind of hollow cathode touches holds pole power supply automatic switchover circuit | |
| CN103595377A (en) | Control circuit of switch of audion | |
| CN204558367U (en) | A kind ofly drive stable control relay circuit | |
| CN219437144U (en) | Shadow K preceding stage switch mute circuit | |
| CN210609665U (en) | Vehicle power amplifier mute circuit | |
| CN219086999U (en) | Redundant circuit of vehicle power supply | |
| CN216215960U (en) | Charging front-end overvoltage protection circuit | |
| CN210517768U (en) | Power switch circuit with short-circuit protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190715 Address after: 510000 Zhangbian Village, Nancun Town, Panyu District, Guangzhou City, Guangdong Province, Self-compiled Room No. 2 101, Shayinggang Industrial Zone, Minzhong Road Patentee after: Guangzhou City West sent electronic Polytron Technologies Inc Address before: 511442 Guangdong Province Panyu District Nancun Town Zhangbian Village Shaying Gang Industrial Zone South 2 all Patentee before: GUANGZHOU CITY FANYU DISTRICT CEOPA ELECTRONIC FACTORY (GENERAL PARTNERSHIP) |