CN205408131U - Wireless audio frequency transmitter circuit - Google Patents

Abstract

The utility model discloses a wireless audio frequency transmitter circuit, including resistance R1, electric capacity C1, diode D1, triode VT1, antenna Y and triode VT2, diode D1 negative pole and input audio signal vi are connected respectively to resistance R1 one end, the anodal connecting resistance R5 of diode D1, the resistance R5 other end is connecting resistance R6 and triode VT1 base respectively, triode VT1 collecting electrode connecting resistance R7, triode VT2 base is connected to the resistance R7 other end, triode VT2 projecting pole is the connecting resistance R6 other end and electric capacity C3 respectively, triode VT1 projecting pole is connected respectively to the electric capacity C3 other end, electric capacity C2, resistance R3, resistance R4 and electric capacity C6. The utility model provides a low -cost, small wireless audio signal transmitter circuit, application scope is extensive.

Description

A kind of wireless audio transmitter circuit

Technical field

This utility model relates to a kind of emitter, specifically a kind of wireless audio transmitter circuit.

Background technology

Sound is to be produced by object vibration, just calls source at the object of sounding.Sound is the pressure wave motion by air.The little bone (auditory ossicles) of pressure wave vibration internal ear, these vibrations are converted into small electronics E.E.G, and it is exactly the sound that we aware.The principle that internal ear adopts is the same with the pronunciation of microphones capture sound wave or speaker, and it is the relation between the mechanical part of movement and barometric wave.Natural, low at sound wave tone, mobile slow and sufficiently large time, we can essentially " sensation " vibrate health to barometric wave.

Development along with science and technology, as mobile phone, panel computer even some intelligent domestic systems, all with audio-frequence player device, and for the audio signal of input, it is required for could playing after treatment, otherwise various noises, the experience of extreme influence people, and be wirelessly well received by consumers now, and all deeply liking this kind equipment of miniaturization.Based on this market demand, the wireless audio signal transmitter circuit that this utility model provides a kind of low cost, volume is little.

Utility model content

The purpose of this utility model is in that to provide a kind of wireless audio transmitter circuit, with the problem solving to propose in above-mentioned background technology.

For achieving the above object, this utility model provides following technical scheme:

nullA kind of wireless audio transmitter circuit，Including resistance R1、Electric capacity C1、Diode D1、Audion VT1、Antenna Y and audion VT2，Described resistance R1 one end connects diode D1 negative pole and input audio signal Vi respectively，Diode D1 positive pole connects resistance R5，The resistance R5 other end connects resistance R6 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects resistance R7，Resistance R7 other end connecting triode VT2 base stage，Audion VT2 emitter stage connects the resistance R6 other end and electric capacity C3 respectively，The electric capacity C3 other end is connecting triode VT1 emitter stage respectively、Electric capacity C2、Resistance R3、Resistance R4 and electric capacity C6，The electric capacity C6 other end connects power supply VCC respectively、Resistance R2、Electric capacity C4 and inductance L1，The inductance L1 other end connects inductance L2 and antenna Y respectively，The inductance L2 other end connects the electric capacity C4 other end and electric capacity C5 respectively，The electric capacity C5 other end is connecting triode VT3 emitter stage and the resistance R4 other end respectively，Audion VT3 base stage connects the resistance R2 other end respectively、The resistance R3 other end、The electric capacity C2 other end and electric capacity C1，The electric capacity C1 other end connects the resistance R1 other end.

As this utility model further scheme: described power supply VCC voltage is 5V.

Compared with prior art, the beneficial effects of the utility model are: the wireless audio signal transmitter circuit that this utility model provides a kind of low cost, volume is little, applied widely.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of wireless audio transmitter circuit.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.

nullRefer to Fig. 1，In this utility model embodiment，A kind of wireless audio transmitter circuit，Including resistance R1、Electric capacity C1、Diode D1、Audion VT1、Antenna Y and audion VT2，Described resistance R1 one end connects diode D1 negative pole and input audio signal Vi respectively，Diode D1 positive pole connects resistance R5，The resistance R5 other end connects resistance R6 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects resistance R7，Resistance R7 other end connecting triode VT2 base stage，Audion VT2 emitter stage connects the resistance R6 other end and electric capacity C3 respectively，The electric capacity C3 other end is connecting triode VT1 emitter stage respectively、Electric capacity C2、Resistance R3、Resistance R4 and electric capacity C6，The electric capacity C6 other end connects power supply VCC respectively、Resistance R2、Electric capacity C4 and inductance L1，The inductance L1 other end connects inductance L2 and antenna Y respectively，The inductance L2 other end connects the electric capacity C4 other end and electric capacity C5 respectively，The electric capacity C5 other end is connecting triode VT3 emitter stage and the resistance R4 other end respectively，Audion VT3 base stage connects the resistance R2 other end respectively、The resistance R3 other end、The electric capacity C2 other end and electric capacity C1，The electric capacity C1 other end connects the resistance R1 other end；Described power supply VCC voltage is 5V.

Operation principle of the present utility model is: refer to Fig. 1, transistor VT3 and peripheral cell thereof constitute a stable state RF agitator, the frequency of agitator is by L1, the inductance value of L2 and tuning capacity C4 determine, input audio signal Vi is after VT1 and VT2 amplifies, deliver to stable state RF agitator, send through antenna Y, electric capacity C5 provides the feedback voltage of necessity for the resistance R4 two ends in VT3 emitter circuit, to maintain oscillating condition, resistance R2 and R3 provides bias necessary to base-emitter node for normal operation, and all radio frequencies feeding back to base circuit are switched to ground by electric capacity C2, the accumulator that electric capacity C6 is L1 and C4 provides radio frequency return path, and stop DC source to return to the colelctor electrode of VT3 simultaneously.

It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and when without departing substantially from spirit of the present utility model or basic feature, it is possible to realize this utility model in other specific forms.Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in this utility model.Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.

Claims (2)

1. null1. a wireless audio transmitter circuit，Including resistance R1、Electric capacity C1、Diode D1、Audion VT1、Antenna Y and audion VT2，It is characterized in that，Described resistance R1 one end connects diode D1 negative pole and input audio signal Vi respectively，Diode D1 positive pole connects resistance R5，The resistance R5 other end connects resistance R6 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects resistance R7，Resistance R7 other end connecting triode VT2 base stage，Audion VT2 emitter stage connects the resistance R6 other end and electric capacity C3 respectively，The electric capacity C3 other end is connecting triode VT1 emitter stage respectively、Electric capacity C2、Resistance R3、Resistance R4 and electric capacity C6，The electric capacity C6 other end connects power supply VCC respectively、Resistance R2、Electric capacity C4 and inductance L1，The inductance L1 other end connects inductance L2 and antenna Y respectively，The inductance L2 other end connects the electric capacity C4 other end and electric capacity C5 respectively，The electric capacity C5 other end is connecting triode VT3 emitter stage and the resistance R4 other end respectively，Audion VT3 base stage connects the resistance R2 other end respectively、The resistance R3 other end、The electric capacity C2 other end and electric capacity C1，The electric capacity C1 other end connects the resistance R1 other end.
2. 2. wireless audio transmitter circuit according to claim 1, it is characterised in that described power supply VCC voltage is 5V.