CN204929165U - Wireless microphone is used in teaching - Google Patents

Abstract

The utility model discloses a wireless microphone is used in teaching, including microphone MU1, resistance R1, electric capacity C1, inductance L1, diode D1 and chip U1, inductance L4 and electric capacity C13 are connected respectively to microphone MU1 one end, and triode BG2 collecting electrode, electric capacity C12 and inductance L3 are connected respectively to the electric capacity C13 other end, and the electric capacity C12 other end, grounded capacitance C14, resistance R10 and inductance L6 are connected respectively to the inductance L3 other end. The utility model discloses wireless microphone is used in teaching circuit structure is simple, it is low to have working voltage, it is sensitive to receive words, manufacturing process is simple, no environmental pollution and low cost, and the diode D3 of BG1 pipe output reverse parallel connection, D4 and C4, R7's circuit, the amplitude limiting effect is played to the strong signal to the characteristic that the internal resistance diminishes when utilizing the diode forward to switch on, and the signal of normal intensity is not influenced, uttering long and high -pitched sounds that positive feedback between microphone and the speaker arouses simultaneously also has good inhibitory action, especially adapted using widely.

Description

A kind of teaching wireless microphone

Technical field

The utility model relates to a kind of wireless microphone, specifically a kind of teaching wireless microphone.

Background technology

Along with the development of science and technology, classroom instruction is more and more modernization also, traditional classroom instruction, it is very arduous that teacher teaches, the quality of instruction in guarantee classroom must be explained and publicised loudly, but, there is the congenital sound of speaking of part teacher just smaller, cannot ensure that the lecture content on classroom all passes to the ear of each student.The a lot of classroom of modern teaching starts to adopt the mode of microphone to give lessons, but existing a lot of microphone must from mouth very close to just can collect voice signal, use inconvenience, and expensive, hinder the modernization of teaching.

Utility model content

The purpose of this utility model is to provide a kind of teaching wireless microphone, 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 teaching wireless microphone, comprises microphone MU1, resistance R1, electric capacity C1, inductance L 1, diode D1 and chip U1, described microphone MU1 one end connects inductance L 4 and electric capacity C13 respectively, and the electric capacity C13 other end is connecting triode BG2 collector electrode respectively, electric capacity C12 and inductance L 3, inductance L 3 other end connects the electric capacity C12 other end respectively, ground capacity C14, resistance R10 and inductance L 6, the resistance R10 other end connects electric capacity C11 and triode BG2 base stage respectively, and the electric capacity C11 other end connects inductance L 2 tap, and inductance L 2 one end connects electric capacity C16 respectively, electric capacity C10, chip U1 pin 4, chip U1 pin 2, power supply VCC, inductance L 6 other end, resistance R9, resistance R5 and resistance R3, the resistance R3 other end is contact resistance R2 and the microphone MU1 other end respectively, the resistance R2 other end is contact resistance R1 and electric capacity C1 respectively, the resistance R1 other end connects electric capacity C1 and electric capacity C2 respectively, the electric capacity C2 other end is connecting triode BG1 base stage and resistance R4 respectively, the resistance R4 other end is the contact resistance R5 other end and electric capacity C3, electric capacity C3 other end contact resistance R6 respectively, and the resistance R6 other end connects diode D4 negative pole respectively, diode D3 positive pole, resistance R8, electric capacity C5 and inductance L 5, inductance L 5 other end connects chip U1 pin 8 and electric capacity C8 respectively, and the electric capacity C8 other end connects electric capacity C9 respectively, inductance L 1 and electric capacity C7, the electric capacity C7 other end connects chip U1 pin 7, chip U1 pin 6 and connects the electric capacity C16 other end respectively, the electric capacity C10 other end and inductance L 2 other end, chip U1 pin 9 is the contact resistance R9 other end respectively, electric capacity C6 and diode D1 positive pole, diode D1 negative pole connects diode D2 positive pole, and diode D2 negative pole connects the electric capacity C6 other end and ground connection, and described inductance L 4 other end is connecting triode BG1 emitter respectively, resistance R7, the resistance R8 other end, the electric capacity C5 other end, the electric capacity C9 other end and inductance L 1 other end ground connection, the resistance R7 other end connects electric capacity C4, and the electric capacity C4 other end connects diode D3 negative pole and diode D4 positive pole respectively, and described chip U1 adopts Q5337.

As the utility model further scheme: described power supply VCC voltage is 6V.

Compared with prior art, the beneficial effects of the utility model are: the utility model teaching wireless microphone circuit structure is simple, have and use low, called sensitive, manufacturing process is simple, cost the is low feature of voltage, and the circuit of diode D3, D4 and C4, R7 of BG1 pipe output reverse parallel connection, the characteristic that when utilizing diode forward conducting, internal resistance diminishes plays amplitude limit effect to strong signal, and the signal of normal intensity is unaffected, uttering long and high-pitched sounds that positive feedback simultaneously between microphone and loud speaker causes also has good inhibitory action, is applicable to very much promoting the use of.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of teaching wireless microphone.

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, in the utility model embodiment, a kind of teaching wireless microphone, comprises microphone MU1, resistance R1, electric capacity C1, inductance L 1, diode D1 and chip U1, microphone MU1 one end connects inductance L 4 and electric capacity C13 respectively, and the electric capacity C13 other end is connecting triode BG2 collector electrode respectively, electric capacity C12 and inductance L 3, inductance L 3 other end connects the electric capacity C12 other end respectively, ground capacity C14, resistance R10 and inductance L 6, the resistance R10 other end connects electric capacity C11 and triode BG2 base stage respectively, and the electric capacity C11 other end connects inductance L 2 tap, and inductance L 2 one end connects electric capacity C16 respectively, electric capacity C10, chip U1 pin 4, chip U1 pin 2, power supply VCC, inductance L 6 other end, resistance R9, resistance R5 and resistance R3, the resistance R3 other end is contact resistance R2 and the microphone MU1 other end respectively, the resistance R2 other end is contact resistance R1 and electric capacity C1 respectively, the resistance R1 other end connects electric capacity C1 and electric capacity C2 respectively, the electric capacity C2 other end is connecting triode BG1 base stage and resistance R4 respectively, the resistance R4 other end is the contact resistance R5 other end and electric capacity C3, electric capacity C3 other end contact resistance R6 respectively, and the resistance R6 other end connects diode D4 negative pole respectively, diode D3 positive pole, resistance R8, electric capacity C5 and inductance L 5, inductance L 5 other end connects chip U1 pin 8 and electric capacity C8 respectively, and the electric capacity C8 other end connects electric capacity C9 respectively, inductance L 1 and electric capacity C7, the electric capacity C7 other end connects chip U1 pin 7, chip U1 pin 6 and connects the electric capacity C16 other end respectively, the electric capacity C10 other end and inductance L 2 other end, chip U1 pin 9 is the contact resistance R9 other end respectively, electric capacity C6 and diode D1 positive pole, diode D1 negative pole connects diode D2 positive pole, and diode D2 negative pole connects the electric capacity C6 other end and ground connection, and inductance L 4 other end is connecting triode BG1 emitter respectively, resistance R7, the resistance R8 other end, the electric capacity C5 other end, the electric capacity C9 other end and inductance L 1 other end ground connection, the resistance R7 other end connects electric capacity C4, and the electric capacity C4 other end connects diode D3 negative pole and diode D4 positive pole respectively, and chip U1 adopts Q5337.

Power supply VCC voltage is 6V.

Operation principle of the present utility model is: refer to Fig. 1, the signal that MU1 exports first is delivered to BG1 pipe and is amplified, wherein R1 and C1 is additional high pitch preemphasis circuit, C2 and C3 is the input and output coupling capacitance of BG1 pipe, its value is used less, in order to bass of decaying, promote alt, the diode D3 of BG1 pipe output reverse parallel connection, D4 and C4, the circuit of R7, that the characteristic that when utilizing diode forward conducting, internal resistance diminishes plays amplitude limit effect to strong signal, and the signal of normal intensity is unaffected, uttering long and high-pitched sounds that positive feedback simultaneously between microphone and loud speaker causes also has good inhibitory action, microphone signal is after BG1 amplifies, be added on the varactor of U1 inside by L5, frequency modulation modulation is carried out to high-frequency signal, larger frequency deviation can be obtained.C7, C8 and C9, L1 form FM signal tuning circuit, and its operating frequency is between 88MHz ~ 108MHz.The high-frequency signal that 6th pin of U1 exports send C11 to be coupled to after BG2 pipe carries out radio frequency amplification after the tuning frequency-selecting of L2 and C10 again, to the microphone signal of space radiation frequency modulation.The high-frequency signal that C13 exports inductance L4 and ground isolate, and receive the skin of shielding conductor.

To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.

In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.

Claims (2)

1. a teaching wireless microphone, comprises microphone MU1, resistance R1, electric capacity C1, inductance L 1, diode D1 and chip U1, is characterized in that, described microphone MU1 one end connects inductance L 4 and electric capacity C13 respectively, and the electric capacity C13 other end is connecting triode BG2 collector electrode respectively, electric capacity C12 and inductance L 3, inductance L 3 other end connects the electric capacity C12 other end respectively, ground capacity C14, resistance R10 and inductance L 6, the resistance R10 other end connects electric capacity C11 and triode BG2 base stage respectively, and the electric capacity C11 other end connects inductance L 2 tap, and inductance L 2 one end connects electric capacity C16 respectively, electric capacity C10, chip U1 pin 4, chip U1 pin 2, power supply VCC, inductance L 6 other end, resistance R9, resistance R5 and resistance R3, the resistance R3 other end is contact resistance R2 and the microphone MU1 other end respectively, the resistance R2 other end is contact resistance R1 and electric capacity C1 respectively, the resistance R1 other end connects electric capacity C1 and electric capacity C2 respectively, the electric capacity C2 other end is connecting triode BG1 base stage and resistance R4 respectively, the resistance R4 other end is the contact resistance R5 other end and electric capacity C3, electric capacity C3 other end contact resistance R6 respectively, and the resistance R6 other end connects diode D4 negative pole respectively, diode D3 positive pole, resistance R8, electric capacity C5 and inductance L 5, inductance L 5 other end connects chip U1 pin 8 and electric capacity C8 respectively, and the electric capacity C8 other end connects electric capacity C9 respectively, inductance L 1 and electric capacity C7, the electric capacity C7 other end connects chip U1 pin 7, chip U1 pin 6 and connects the electric capacity C16 other end respectively, the electric capacity C10 other end and inductance L 2 other end, chip U1 pin 9 is the contact resistance R9 other end respectively, electric capacity C6 and diode D1 positive pole, diode D1 negative pole connects diode D2 positive pole, and diode D2 negative pole connects the electric capacity C6 other end and ground connection, and described inductance L 4 other end is connecting triode BG1 emitter respectively, resistance R7, the resistance R8 other end, the electric capacity C5 other end, the electric capacity C9 other end and inductance L 1 other end ground connection, the resistance R7 other end connects electric capacity C4, and the electric capacity C4 other end connects diode D3 negative pole and diode D4 positive pole respectively, and described chip U1 adopts Q5337.

2. teaching wireless microphone according to claim 1, is characterized in that, described power supply VCC voltage is 6V.