CN205610587U - Amplitude modulation converting circuit - Google Patents

Abstract

The utility model discloses an amplitude modulation converting circuit, including antenna Y, inductance L1, electric capacity C1, resistance R1, triode VT1 and transformer T, the transformer T coil L4 one end VCC that connects respectively, electric capacity C8, resistance R4 and resistance R3, the transformer T coil L4 other end is connecting resistance C8 and triode VT2 collecting electrode respectively, transformer T coil L5 is connected to triode VT2 projecting pole, triode VT2 base is connecting resistance R4 respectively, electric capacity C7 and electric capacity C6, the electric capacity C6 other end is the connecting resistance R3 other end and inductance L3 respectively, the inductance L3 other end is connecting resistance R2 respectively, electric capacity C5, electric capacity C4 and inductance L2. The utility model discloses amplitude modulation converting circuit at first adopts super -regeneration receiving circuit to select signal frequency, and later the rethread amplifier carries out audio power amplifier to export after keeping apart the coupling through isolation transformer T, stability is high, and the interference killing feature is strong.

Description

A kind of FMAM change-over circuit

Technical field

This utility model relates to a kind of change-over circuit, specifically a kind of FMAM change-over circuit.

Background technology

Sound is to be produced by object vibration, and the just object at sounding calls source.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 uses is as 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.

Wirelessly it is well received by consumers now, and the most deeply liking this kind equipment of miniaturization, for the audio signal being wirelessly input to, first have to select into overfrequency, could play after carrying out amplitude modulation process again, the most various noises, the experience of extreme influence people, based on this market demand, the FMAM change-over circuit that this utility model provides a kind of low cost, volume is little.

Utility model content

The purpose of this utility model is to provide a kind of FMAM change-over circuit, with the problem solving to propose in above-mentioned background technology.

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

nullA kind of FMAM change-over circuit，Including antenna Y、Inductance L1、Electric capacity C1、Resistance R1、Audion VT1 and transformator T，Described transformator T coil L4 one end connects power supply VCC respectively、Electric capacity C8、Resistance R4 and resistance R3，The transformator T coil L4 other end connects resistance C8 and audion VT2 colelctor electrode respectively，Audion VT2 emitter stage connection transformer T coil L5，Audion VT2 base stage connects resistance R4 respectively、Electric capacity C7 and electric capacity C6，The electric capacity C6 other end connects the resistance R3 other end and inductance L3 respectively，The inductance L3 other end connects resistance R2 respectively、Electric capacity C5、Electric capacity C4 and inductance L2，The resistance R2 other end connects electric capacity C3 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects electric capacity C2 respectively、The electric capacity C4 other end and the inductance L2 other end，The electric capacity C2 other end connecting triode VT1 emitter stage and inductance L1 one end respectively，Inductance L1 tap connects antenna Y，The inductance L1 other end connects resistance R1 and electric capacity C1 respectively，The resistance R1 other end connects the electric capacity C1 other end respectively、The electric capacity C3 other end、The electric capacity C5 other end、The electric capacity C7 other end、The transformator T coil L5 other end and transformator T coil L6 ground connection，The transformator T coil L6 other end is output end vo.

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: signal frequency is selected by this utility model FMAM change-over circuit initially with Armstrong circuit, audio frequency amplification is carried out the most again by amplifier, and by exporting after isolating transformer T isolation coupling, stability is high, and capacity of resisting disturbance is strong.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of FMAM change-over 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 are obtained 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 FMAM change-over circuit，Including antenna Y、Inductance L1、Electric capacity C1、Resistance R1、Audion VT1 and transformator T，Described transformator T coil L4 one end connects power supply VCC respectively、Electric capacity C8、Resistance R4 and resistance R3，The transformator T coil L4 other end connects resistance C8 and audion VT2 colelctor electrode respectively，Audion VT2 emitter stage connection transformer T coil L5，Audion VT2 base stage connects resistance R4 respectively、Electric capacity C7 and electric capacity C6，The electric capacity C6 other end connects the resistance R3 other end and inductance L3 respectively，The inductance L3 other end connects resistance R2 respectively、Electric capacity C5、Electric capacity C4 and inductance L2，The resistance R2 other end connects electric capacity C3 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects electric capacity C2 respectively、The electric capacity C4 other end and the inductance L2 other end，The electric capacity C2 other end connecting triode VT1 emitter stage and inductance L1 one end respectively，Inductance L1 tap connects antenna Y，The inductance L1 other end connects resistance R1 and electric capacity C1 respectively，The resistance R1 other end connects the electric capacity C1 other end respectively、The electric capacity C3 other end、The electric capacity C5 other end、The electric capacity C7 other end、The transformator T coil L5 other end and transformator T coil L6 ground connection，The transformator T coil L6 other end is output end vo；Described power supply VCC voltage is 5V.

Operation principle of the present utility model is: refer to Fig. 1, antenna Y, audion VT1, inductance L1, electric capacity C1, resistance R1 and electric capacity C3 etc. form a super-regenerative receiver, antenna Y receive FM signal and from FM signal audio detection signal, inductance L2 and electric capacity C4 is resonant tank, the value changing electric capacity C4 can change the FM signal frequency that antenna Y receives, C2 is superregenerative oscillatory feedback electric capacity, and R2 is the biasing resistor of VT1, and the value changing R2 can regulate vibration power；Through super-regenerative receiver select FM signal through L3 and C6 couple after, deliver to audion VT2 carry out replicate amplify, and after transformer coupled from output end vo export.

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 in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize this utility model in other specific forms.Therefore, no matter from the point of view of 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 fallen in the implication of equivalency and scope of claim included in this utility model.Should not be considered as limiting involved claim by any reference in claim.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.

Claims (2)

1. null1. a FMAM change-over circuit，Including antenna Y、Inductance L1、Electric capacity C1、Resistance R1、Audion VT1 and transformator T，It is characterized in that，Described transformator T coil L4 one end connects power supply VCC respectively、Electric capacity C8、Resistance R4 and resistance R3，The transformator T coil L4 other end connects resistance C8 and audion VT2 colelctor electrode respectively，Audion VT2 emitter stage connection transformer T coil L5，Audion VT2 base stage connects resistance R4 respectively、Electric capacity C7 and electric capacity C6，The electric capacity C6 other end connects the resistance R3 other end and inductance L3 respectively，The inductance L3 other end connects resistance R2 respectively、Electric capacity C5、Electric capacity C4 and inductance L2，The resistance R2 other end connects electric capacity C3 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects electric capacity C2 respectively、The electric capacity C4 other end and the inductance L2 other end，The electric capacity C2 other end connecting triode VT1 emitter stage and inductance L1 one end respectively，Inductance L1 tap connects antenna Y，The inductance L1 other end connects resistance R1 and electric capacity C1 respectively，The resistance R1 other end connects the electric capacity C1 other end respectively、The electric capacity C3 other end、The electric capacity C5 other end、The electric capacity C7 other end、The transformator T coil L5 other end and transformator T coil L6 ground connection，The transformator T coil L6 other end is output end vo.
2. FMAM change-over circuit the most according to claim 1, it is characterised in that described power supply VCC voltage is 5V.