CN207382554U - A kind of megaphone circuit - Google Patents
A kind of megaphone circuit Download PDFInfo
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- CN207382554U CN207382554U CN201721567821.9U CN201721567821U CN207382554U CN 207382554 U CN207382554 U CN 207382554U CN 201721567821 U CN201721567821 U CN 201721567821U CN 207382554 U CN207382554 U CN 207382554U
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Abstract
The utility model discloses a kind of megaphone circuits.Microphone one end respectively with first resistor one end, first capacitance cathode is connected, microphone one end connects adjustment pipe emitter respectively, adjustable resistance one end, the in-phase input end of integrated operational amplifier, loud speaker one end and power cathode, the first resistor other end connects second resistance one end respectively, 3rd resistor one end, 4th capacitance cathode and switch one end, first capacitance cathode connects the second resistance other end respectively, second capacitance cathode and adjustment pipe collector, second capacitance cathode connects the adjustable resistance other end, the inverting input of the adjustable termination integrated operational amplifier of adjustable resistance, the output of integrated operational amplifier terminates the 3rd capacitance cathode, 3rd capacitance cathode connects the loud speaker other end, the switch other end is connected with positive pole.The utility model circuit structure is simple and clear, reduces the cost of manufacture of megaphone, working service is more convenient reliable, highly practical.
Description
Technical field
The utility model is related to megaphone technical fields, and in particular to a kind of megaphone circuit.
Background technology
Megaphone structure species at present on the market are various, and miscellaneous megaphone is dazzling, megaphone
Internal circuit structure is also more complicated, and cost is higher, and making is also more complicated, therefore, it is simpler to design a kind of circuit structure
Singly clear megaphone circuit is extremely necessary.
Utility model content
To solve the above problems, the utility model provides a kind of megaphone circuit, circuit structure is simple and clear, reduces
The cost of manufacture of megaphone, working service is more convenient reliable, highly practical.
To achieve the above object, the technical solution that the utility model is taken is：
A kind of megaphone circuit, including first resistor R1, second resistance R2,3rd resistor R3, integrated operational amplifier
LM386, the first capacitance C1, the second capacitance C2, the 3rd capacitance C3, the 4th capacitance C4, adjustment pipe VT, microphone B1, loud speaker B2 and
S is switched, microphone B1 one end is connected respectively with first resistor R1 one end, the first capacitance C1 anodes, and microphone B1 one end connects adjustment respectively
Pipe VT emitters, adjustable resistance RP one end, the in-phase input end of integrated operational amplifier LM386, loud speaker B2 one end and power supply
Cathode, the first resistor R1 other ends connect second resistance R2 one end, 3rd resistor R3 one end, the 4th capacitance C4 anodes and switch respectively
S one end, the first capacitance C1 cathode connect the second resistance R2 other ends, the second capacitance C2 anodes and adjustment pipe VT collectors respectively, the
Two capacitance C2 cathode connect the adjustable resistance RP other ends, and the adjustable termination integrated operational amplifier LM386's of adjustable resistance RP is anti-
Phase input terminal, the output of integrated operational amplifier LM386 terminate the 3rd capacitance C3 anodes, and the 3rd capacitance C3 cathode meet loud speaker B2
The other end, the switch S other ends are connected with positive pole.
Preferably, the microphone B1 is Electret condenser microphone.
Preferably, the 4th capacitance C4 cathode ground connection.
The utility model has the advantages that：Circuit structure is simple and clear, reduces the cost of manufacture of megaphone, makes
It is more convenient reliable with safeguarding, it is highly practical.
Description of the drawings
Fig. 1 is the circuit structure diagram of the utility model.
Specific embodiment
In order to which the purpose of this utility model and advantage is more clearly understood, with reference to embodiments to the utility model into
Row is further described.It should be appreciated that specific embodiment described herein is only used to explain the utility model, and do not have to
In restriction the utility model.
As shown in Figure 1, the utility model embodiment provides a kind of megaphone circuit, including first resistor R1, the second electricity
Hinder R2,3rd resistor R3, integrated operational amplifier LM386, the first capacitance C1, the second capacitance C2, the 3rd capacitance C3, the 4th capacitance
C4, adjustment pipe VT, microphone B1, loud speaker B2 and switch S, microphone B1 one end respectively with first resistor R1 one end, the first capacitance C1
Anode is connected, and microphone B1 one end meets adjustment pipe VT emitters, adjustable resistance RP one end, integrated operational amplifier LM386 respectively
In-phase input end, loud speaker B2 one end and power cathode, the first resistor R1 other ends connect second resistance R2 one end, the 3rd electricity respectively
It hinders R3 one end, the 4th capacitance C4 anodes and switch S one end, the first capacitance C1 cathode and connects the second resistance R2 other ends, second respectively
Capacitance C2 anodes and adjustment pipe VT collectors, the second capacitance C2 cathode connect the adjustable resistance RP other ends, and adjustable resistance RP's is adjustable
The inverting input of section termination integrated operational amplifier LM386, the output of integrated operational amplifier LM386 terminate the 3rd capacitance C3
Anode, the 3rd capacitance C3 cathode connect the loud speaker B2 other ends, and the switch S other ends are connected with positive pole.
It is worth noting that, the microphone B1 is Electret condenser microphone.
In addition, the 4th capacitance C4 cathode ground connection.
The integrated operational amplifier LM386 of present embodiment is as a power amplifier, peak power output 600mW,
For circuit by four section dry cell power supplies, microphone B1 switchs to sound the base stage for being added to adjustment pipe VT after electric signal through the first capacitance C1,
The signal of adjusted pipe VT amplifications is sent to the input terminal of integrated operational amplifier LM386 by its collector by the second capacitance C2,
It after amplification inside integrated operational amplifier LM386, is exported by LM386 output terminals, loud speaker is promoted by the 3rd capacitance C3
B2 makes a sound.Entire circuit structure is simple and clear, and at low cost, easy to use and reliable, easy to maintain is highly practical.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (3)
1. a kind of megaphone circuit, which is characterized in that including first resistor R1, second resistance R2,3rd resistor R3, integrated computation
Amplifier LM386, the first capacitance C1, the second capacitance C2, the 3rd capacitance C3, the 4th capacitance C4, adjustment pipe VT, microphone B1, raise one's voice
Device B2 and switch S, microphone B1 one end are connected respectively with first resistor R1 one end, the first capacitance C1 anodes, microphone B1 one end difference
Connect adjustment pipe VT emitters, adjustable resistance RP one end, the in-phase input end of integrated operational amplifier LM386, loud speaker B2 one end
And power cathode, the first resistor R1 other ends connect second resistance R2 one end, 3rd resistor R3 one end, the 4th capacitance C4 anodes respectively
With switch S one end, the first capacitance C1 cathode connect the second resistance R2 other ends, the second capacitance C2 anodes and adjustment pipe VT current collections respectively
Pole, the second capacitance C2 cathode meet the adjustable resistance RP other ends, the adjustable termination integrated operational amplifier LM386 of adjustable resistance RP
Inverting input, the output of integrated operational amplifier LM386 terminates the 3rd capacitance C3 anodes, and the 3rd capacitance C3 cathode, which connect, raises one's voice
The device B2 other ends, the switch S other ends are connected with positive pole.
2. megaphone circuit according to claim 1, which is characterized in that the microphone B1 is Electret condenser microphone.
3. megaphone circuit according to claim 1, which is characterized in that the 4th capacitance C4 cathode ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721567821.9U CN207382554U (en) | 2017-11-22 | 2017-11-22 | A kind of megaphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721567821.9U CN207382554U (en) | 2017-11-22 | 2017-11-22 | A kind of megaphone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207382554U true CN207382554U (en) | 2018-05-18 |
Family
ID=62333468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721567821.9U Active CN207382554U (en) | 2017-11-22 | 2017-11-22 | A kind of megaphone circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207382554U (en) |
-
2017
- 2017-11-22 CN CN201721567821.9U patent/CN207382554U/en active Active
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