CN204697055U - A kind of simple and practical interphone circuit - Google Patents

Abstract

The utility model discloses a kind of simple and practical interphone circuit, comprise resistance R1, crystal oscillator X, triode V1 and inductance L 1, one end of described resistance R1 connects the pin 2 of electric capacity C1, inductance L 1, winding N1, the resistance R8 of transformer W, resistance R9, power supply VCC and chip IC 1, and the other end of electric capacity C1 connects crystal oscillator X, the collector electrode of triode V1 and the other end of inductance L 1.The utility model interphone circuit is provided with the self-extinguishing superregenerative detection circuit be made up of triode, there is higher anti-interference and frequency stability, undistorted power output can be ensured, adopt LM389 audio frequency amplification chip simultaneously, not only increase circuit level, and accuracy is improved, therefore circuit have that structure is simple, stable performance, strong interference immunity advantage.

Description

A kind of simple and practical interphone circuit

Technical field

The utility model relates to a kind of interphone circuit, specifically a kind of simple and practical interphone circuit.

Background technology

Intercom, as the important tool of short haul connection and mobile dispatch control, is all widely used at social industry-by-industry.Especially along with the development of digital circuit technique, the analog-interphone relatively traditional in external form or performance of novel intercom has all had significant progress, the signal disturbing of intercom and transmission range are maximum difficult problems for talkback system research always, traditional intercom existence and stability is poor, be subject to noise jamming, shortcoming that transmission range is short, and cost of manufacture is relatively high, the use seriously hindering intercom is promoted.

Utility model content

The purpose of this utility model is the simple and practical interphone circuit providing a kind of structure simple, easy to use, to solve the problem proposed in above-mentioned background technology.

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

A simple and practical interphone circuit, comprises resistance R1, crystal oscillator X, triode V1 and inductance L 1, one end of described resistance R1 connects electric capacity C1, inductance L 1, the winding N1 of transformer W, resistance R8, resistance R9, the pin 2 of power supply VCC and chip IC 1, the other end of electric capacity C1 connects crystal oscillator X, the collector electrode of triode V1 and the other end of inductance L 1, the other end contact resistance R2 of resistance R1, the other end of crystal oscillator X and the base stage of triode V1, the other end contact resistance R3 of resistance R1, resistance R4, resistance R5, electric capacity C2, electric capacity C5, electric capacity C6, electric capacity C10, electric capacity C11, electric capacity C17, loud speaker B, inductance L 6, pick-up A, the winding N2 of transformer W, the pin 5 of chip IC 1, the pin 18 of chip IC 1 and the pin 19 of chip IC 1, the other end of emitter contact resistance R3 of triode V1 and the other end of electric capacity C2, the other end of resistance R4 connects the other end and the inductance L 2 of electric capacity C5, the other end two of inductance L 2 connects the base stage of triode V2, the other end of emitter contact resistance R5 of triode V2 and the other end of electric capacity C6, the collector electrode of triode V2 connects electric capacity C4, electric capacity C15 and inductance L 3, the other end of electric capacity C4 connects the other end of the other end of inductance L 3 and the winding N1 of transformer W, the other end of the winding N2 of transformer W connects the pin 2 of single-pole double-throw switch (SPDT) S3, the other end of electric capacity C15 connects the pin 2 of single-pole double-throw switch (SPDT) S1, the pin 1 of single-pole double-throw switch (SPDT) S1 connects inductance L 4, the other end of inductance L 4 connects antenna T, and the pin 3 of single-pole double-throw switch (SPDT) S1 connects electric capacity C9, and the other end of electric capacity C9 connects electric capacity C8, the other end of inductance L 6 and the emitter of triode V3, the collector electrode of triode V3 connects electric capacity C7, the other end of electric capacity C8 and inductance L 5, the other end of inductance L 5 connects the other end of electric capacity C7, the other end of electric capacity C10, electric capacity C13, the other end of resistance R7, the other end of resistance R8 and resistance R6, the other end of resistance R6 connects the other end of electric capacity C13 and the base stage of triode V3, the other end of resistance R7 connects the other end and the electric capacity C12 of electric capacity C11, the other end of electric capacity C12 connects the pin 3 of single-pole double-throw switch (SPDT) S2, the other end of resistance R9 connects the other end of pick-up A and the pin 2 of single-pole double-throw switch (SPDT) S2, the pin 1 of single-pole double-throw switch (SPDT) S2 connects electric capacity C14, the other end of electric capacity C14 connects the pin 16 of chip IC 1, the pin 3 of chip IC 1 connects the other end of electric capacity C17, the pin 1 of chip IC 1 connects electric capacity C18, the other end of electric capacity C18 connects the pin 1 of single-pole double-throw switch (SPDT) S3, and the pin 3 of single-pole double-throw switch (SPDT) S3 connects the other end of loud speaker B.

As preferred version of the present utility model: the model of described chip IC 1 is LM389.

As preferred version of the present utility model: described power supply VCC is 12V direct current.

Compared with prior art, the beneficial effects of the utility model are: the utility model interphone circuit is provided with the self-extinguishing superregenerative detection circuit be made up of triode, there is higher anti-interference and frequency stability, undistorted power output can be ensured, adopt LM389 audio frequency amplification chip simultaneously, not only increase circuit level, and accuracy is improved, therefore circuit have that structure is simple, stable performance, strong interference immunity advantage.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of simple and practical interphone 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 simple and practical interphone circuit, comprises resistance R1, crystal oscillator X, triode V1 and inductance L 1, one end of described resistance R1 connects electric capacity C1, inductance L 1, the winding N1 of transformer W, resistance R8, resistance R9, the pin 2 of power supply VCC and chip IC 1, the other end of electric capacity C1 connects crystal oscillator X, the collector electrode of triode V1 and the other end of inductance L 1, the other end contact resistance R2 of resistance R1, the other end of crystal oscillator X and the base stage of triode V1, the other end contact resistance R3 of resistance R1, resistance R4, resistance R5, electric capacity C2, electric capacity C5, electric capacity C6, electric capacity C10, electric capacity C11, electric capacity C17, loud speaker B, inductance L 6, pick-up A, the winding N2 of transformer W, the pin 5 of chip IC 1, the pin 18 of chip IC 1 and the pin 19 of chip IC 1, the other end of emitter contact resistance R3 of triode V1 and the other end of electric capacity C2, the other end of resistance R4 connects the other end and the inductance L 2 of electric capacity C5, the other end two of inductance L 2 connects the base stage of triode V2, the other end of emitter contact resistance R5 of triode V2 and the other end of electric capacity C6, the collector electrode of triode V2 connects electric capacity C4, electric capacity C15 and inductance L 3, the other end of electric capacity C4 connects the other end of the other end of inductance L 3 and the winding N1 of transformer W, the other end of the winding N2 of transformer W connects the pin 2 of single-pole double-throw switch (SPDT) S3, the other end of electric capacity C15 connects the pin 2 of single-pole double-throw switch (SPDT) S1, the pin 1 of single-pole double-throw switch (SPDT) S1 connects inductance L 4, the other end of inductance L 4 connects antenna T, and the pin 3 of single-pole double-throw switch (SPDT) S1 connects electric capacity C9, and the other end of electric capacity C9 connects electric capacity C8, the other end of inductance L 6 and the emitter of triode V3, the collector electrode of triode V3 connects electric capacity C7, the other end of electric capacity C8 and inductance L 5, the other end of inductance L 5 connects the other end of electric capacity C7, the other end of electric capacity C10, electric capacity C13, the other end of resistance R7, the other end of resistance R8 and resistance R6, the other end of resistance R6 connects the other end of electric capacity C13 and the base stage of triode V3, the other end of resistance R7 connects the other end and the electric capacity C12 of electric capacity C11, the other end of electric capacity C12 connects the pin 3 of single-pole double-throw switch (SPDT) S2, the other end of resistance R9 connects the other end of pick-up A and the pin 2 of single-pole double-throw switch (SPDT) S2, the pin 1 of single-pole double-throw switch (SPDT) S2 connects electric capacity C14, the other end of electric capacity C14 connects the pin 16 of chip IC 1, the pin 3 of chip IC 1 connects the other end of electric capacity C17, the pin 1 of chip IC 1 connects electric capacity C18, the other end of electric capacity C18 connects the pin 1 of single-pole double-throw switch (SPDT) S3, and the pin 3 of single-pole double-throw switch (SPDT) S3 connects the other end of loud speaker B.

The model of chip IC 1 is LM389.Power supply VCC is 12V direct current.

Operation principle of the present utility model is: the triode V1 in circuit makes carrier wave crystal oscillator, V2 makes carrier amplifier, V3 makes superregenrative reception wave detector, and crystal oscillator X, triode V1 etc. form the carrier oscillator of high stability, and oscillator signal is coupled to L2 by L1.Carrier power amplification is carried out by V2.C1, L1 and C4, L3 form two frequency-selective circuits in parallel.When their resonance frequency is consistent with X natural mode shape.Can obtain maximum transmitting power, general speech range can reach 2.5km ~ 3km.When S1 put 1,2 pin time, the audio signal that pick-up B picks up carries out power amplification through LM389, add to modulation transformer W, different by audio signal level height, control the operating voltage of carrier power amplifier tube V2, realize the amplitude modulation(PAM) (amplitude modulation) to oscillator signal, then deliver to antenna T through C15, L4.To spatial emission.R1, R2 determine, V1 working point.

V3 etc. form self-extinguishing superregenrative reception detecting circuit, and the shunt-resonant circuit be made up of C7, L5 by receipts frequency (i.e. the other side's machine tranmitting frequency) determines.R6 is used for arranging V3 DC point, and jointly determines that this frequency should be selected higher than audio frequency lower than carrier oscillation frequency from putting out frequency with C13.The sensitivity of superregenerative detection is very high, can reach hundreds of thousands doubly to the magnification ratio of small-signal.With there is the typical super-heterodyne receiver put in one-level independence local oscillator, one-level mixing, two-stage be more or less the same.R6 is detection load resistance, and the audio signal that demodulation (unloading ripple) goes out, after R7, C10, C11 filtering, carries out power amplification by LM389, promotes loud speaker B sounding.When B impedance is 8 Ω, the undistorted power output of 450mV can be obtained.

Claims (3)

1. a simple and practical interphone circuit, comprises resistance R1, crystal oscillator X, triode V1 and inductance L 1, it is characterized in that, one end of described resistance R1 connects electric capacity C1, inductance L 1, the winding N1 of transformer W, resistance R8, resistance R9, the pin 2 of power supply VCC and chip IC 1, the other end of electric capacity C1 connects crystal oscillator X, the collector electrode of triode V1 and the other end of inductance L 1, the other end contact resistance R2 of resistance R1, the other end of crystal oscillator X and the base stage of triode V1, the other end contact resistance R3 of resistance R1, resistance R4, resistance R5, electric capacity C2, electric capacity C5, electric capacity C6, electric capacity C10, electric capacity C11, electric capacity C17, loud speaker B, inductance L 6, pick-up A, the winding N2 of transformer W, the pin 5 of chip IC 1, the pin 18 of chip IC 1 and the pin 19 of chip IC 1, the other end of emitter contact resistance R3 of triode V1 and the other end of electric capacity C2, the other end of resistance R4 connects the other end and the inductance L 2 of electric capacity C5, the other end two of inductance L 2 connects the base stage of triode V2, the other end of emitter contact resistance R5 of triode V2 and the other end of electric capacity C6, the collector electrode of triode V2 connects electric capacity C4, electric capacity C15 and inductance L 3, the other end of electric capacity C4 connects the other end of the other end of inductance L 3 and the winding N1 of transformer W, the other end of the winding N2 of transformer W connects the pin 2 of single-pole double-throw switch (SPDT) S3, the other end of electric capacity C15 connects the pin 2 of single-pole double-throw switch (SPDT) S1, the pin 1 of single-pole double-throw switch (SPDT) S1 connects inductance L 4, the other end of inductance L 4 connects antenna T, and the pin 3 of single-pole double-throw switch (SPDT) S1 connects electric capacity C9, and the other end of electric capacity C9 connects electric capacity C8, the other end of inductance L 6 and the emitter of triode V3, the collector electrode of triode V3 connects electric capacity C7, the other end of electric capacity C8 and inductance L 5, the other end of inductance L 5 connects the other end of electric capacity C7, the other end of electric capacity C10, electric capacity C13, the other end of resistance R7, the other end of resistance R8 and resistance R6, the other end of resistance R6 connects the other end of electric capacity C13 and the base stage of triode V3, the other end of resistance R7 connects the other end and the electric capacity C12 of electric capacity C11, the other end of electric capacity C12 connects the pin 3 of single-pole double-throw switch (SPDT) S2, the other end of resistance R9 connects the other end of pick-up A and the pin 2 of single-pole double-throw switch (SPDT) S2, the pin 1 of single-pole double-throw switch (SPDT) S2 connects electric capacity C14, the other end of electric capacity C14 connects the pin 16 of chip IC 1, the pin 3 of chip IC 1 connects the other end of electric capacity C17, the pin 1 of chip IC 1 connects electric capacity C18, the other end of electric capacity C18 connects the pin 1 of single-pole double-throw switch (SPDT) S3, and the pin 3 of single-pole double-throw switch (SPDT) S3 connects the other end of loud speaker B.

2. a kind of simple and practical interphone circuit according to claim 1, is characterized in that, the model of described chip IC 1 is LM389.

3. a kind of simple and practical interphone circuit according to claim 1, is characterized in that, described power supply VCC is 12V direct current.