CN217240694U

CN217240694U - double-FM radio

Info

Publication number: CN217240694U
Application number: CN202220985691.5U
Authority: CN
Inventors: 余波; 雷建平; 熊连平; 苏德翔; 李波
Original assignee: Chengdu Kt Electronic Hi Tech Co ltd
Current assignee: Chengdu Kt Electronic Hi Tech Co ltd
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-08-19
Anticipated expiration: 2032-04-26

Abstract

The utility model discloses a double FM radio, which comprises a central controller module, a power amplifier module and a double FM radio module; the central controller module is respectively connected with the power amplifier module and the double FM radio modules; the double FM radio modules comprise FM radio frequency modulation chips U2 and FM radio frequency modulation chips U3. The utility model discloses a two FM radio modules can realize outputting the audio frequency of main road frequency point signal in emergency broadcasting to collect reserve frequency point signal, in time switch over reserve frequency point signal output audio frequency when main road frequency point signal strength is low, reduce the effect that artificial intervention reaches only can control.

Description

double-FM radio

Technical Field

The utility model belongs to the technical field of the radio, concretely relates to two FM radios.

Background

The radio is a machine which can convert electric wave signals by using electric energy and listen to audio signals transmitted by a broadcasting station, namely radio, broadcasting and the like, the emergence of the radio adopting the DSP technology marks that the traditional analog radio gradually exits from the historical stage, and the digital age of the radio has come. One type of the traditional FM receiving equipment is formed based on discrete electronic elements and mainly comprises an antenna, a tuning amplifier, a local oscillator, a mixer, intermediate frequency amplification, a detector, a power amplifier, a power supply and the like; the other type of the antenna mainly comprises an antenna, an FM tuning receiving chip, a microcontroller, a power amplifier, a power supply and the like.

The traditional FM radio circuit formed by discrete components has the defects that although the technology is mature, the discrete electronic components are more in quantity, complex in debugging, easy to be interfered by external factors and high in technical requirement; at present, although the problem of excessive discrete elements of the traditional radio is solved by a circuit based on a microprocessor and an FM tuning receiving chip, new frequency point signals cannot be switched through a standby channel when main receiving signals are weak due to the fact that signals are relatively weak at a relatively long distance from a transmitting radio station in remote mountainous areas or at the periphery of cities.

SUMMERY OF THE UTILITY MODEL

Not enough to the above-mentioned among the prior art, the utility model provides a pair of two FM radios have solved the problem that can't handle multichannel frequency point signal in emergency broadcasting.

In order to achieve the purpose of the invention, the utility model adopts the technical scheme that: a double-FM radio comprises a central controller module, a power amplifier module and a double-FM radio module; the central controller module is respectively connected with the power amplification module and the double FM radio modules;

the double FM radio modules comprise FM radio frequency modulation chips U2 and FM radio frequency modulation chips U3.

Further: the type of the single chip microcomputer U1 is specifically STC89C 52.

Further, the method comprises the following steps: the central controller module comprises a single chip U1, a crystal oscillator Y1, a grounding capacitor C1, a grounding capacitor C2, a capacitor C3 and a grounding resistor R1;

the No. 18 pin of the single chip U1 is connected with one end of a crystal oscillator Y1 and a grounding capacitor C2 respectively, the No. 19 pin of the single chip U1 is connected with the other end of the crystal oscillator Y1 and a grounding capacitor C1 respectively, the No. 9 pin of the single chip U1 is connected with one ends of a grounding resistor R1 and a capacitor C3 respectively, and the No. 31 pin of the single chip U1 and the other end of the capacitor C3 are connected with a 5V power supply.

Further: the model of the FM radio frequency modulation chip U2 and the model of the FM radio frequency modulation chip U3 are both QN 8035-SANA.

Further, the method comprises the following steps: the double FM radio module further comprises a crystal oscillator Y2, an inductor L1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a grounded capacitor C4, a grounded capacitor C5, a capacitor C6, a capacitor C7, a grounded capacitor C8, a grounded capacitor C9, a grounded capacitor C10, a grounded capacitor C11, a grounded capacitor C12, a grounded capacitor C13, a grounded capacitor C14, a grounded capacitor C15 and a grounded capacitor C16;

the No. 1 pin of the FM radio frequency modulation chip U2 is connected with one end of a grounding capacitor C4, a grounding capacitor C5 and a resistor R2 respectively, the other end of the resistor R2 is connected with a 3.3V power supply, the No. 4 pin and the No. 8 pin of the FM radio frequency modulation chip U2 are both grounded, the No. 5 pin of the FM radio frequency modulation chip U2 is connected with the No. 5 pin of the FM radio frequency modulation chip U3 sequentially through the capacitor C6 and the capacitor C7, the No. 7 pin of the FM radio frequency modulation chip U2 is connected with one end of the resistor R11 through the resistor R4, and the No. 6 pin of the FM radio frequency modulation chip U2 is connected with the 3.3V power supply through the resistor R3; a pin 9 of the FM radio frequency modulation chip U2 is connected with a 3.3V power supply through the resistor R14, a pin 9 of the FM radio frequency modulation chip U2 is also connected with the grounding capacitor C15, a pin 10 of the FM radio frequency modulation chip U2 is connected with the 3.3V power supply through the resistor R15, and a pin 10 of the FM radio frequency modulation chip U2 is also connected with the grounding capacitor C16;

a pin 1 of the FM radio and frequency modulation chip U3 is respectively connected with one end of the grounding capacitor C8, the grounding capacitor C9 and one end of the resistor R7, the other end of the resistor R7 is connected with a 3.3V power supply, a pin 2 of the FM radio and frequency modulation chip U3 is connected with one end of the resistor R5, and a pin 3 of the FM radio and frequency modulation chip U3 is connected with one end of the resistor R6; the No. 4 pin and the No. 8 pin of the FM radio and frequency modulation chip U3 are both grounded, the No. 7 pin of the FM radio and frequency modulation chip U3 is connected with one end of the resistor R11 through the resistor R9, and the No. 6 pin of the FM radio and frequency modulation chip U3 is connected with a 3.3V power supply through the resistor R8; a pin 9 of the FM radio frequency modulation chip U3 is connected with a 3.3V power supply through the resistor R12, a pin 9 of the FM radio frequency modulation chip U3 is also connected with the grounding capacitor C13, a pin 10 of the FM radio frequency modulation chip U3 is connected with the 3.3V power supply through the resistor R13, and a pin 10 of the FM radio frequency modulation chip U3 is also connected with the grounding capacitor C14;

no. 1 pin of crystal oscillator Y2 with resistance R10's one end is connected, crystal oscillator Y2's No. 2 pin ground connection, crystal oscillator Y2's No. 3 pin with resistance R11's the other end is connected, crystal oscillator Y2's No. 4 pin respectively with resistance R10's the other end, grounded capacitance C10, grounded capacitance C11 and inductance L1's one end are connected, inductance L1's the other end respectively with grounded capacitance C12 and 3.3V power are connected.

The beneficial effects of the above further scheme are: FM radio frequency modulation chip U2 can collect the frequency point signal of setting for the frequency channel, and FM radio frequency modulation chip U3 constantly alternates remaining frequency point signal for central controller module control switches the audio frequency that main road frequency point signal and reserve frequency point signal correspond.

Further, the method comprises the following steps: the double FM radio module is also provided with an audio amplification chip U4, and the model of the audio amplification chip is specifically AZ4558 AM; and the No. 3 pin of the audio amplification chip U4 is respectively connected with the other end of the resistor R5 and the other end of the resistor R6.

The beneficial effects of the above further scheme are: the audio amplification chip U4 can carry out low-distortion amplification on the frequency point signals and send the amplified frequency point signals to the single chip microcomputer.

Further: the power amplification module comprises a horn RL, a sliding resistor P1, a sliding resistor P2, a diode D1, an NPN type triode T1, a PNP type triode T2, an NPN type triode T3, a grounding resistor R16, a resistor R17, a resistor R18, a resistor R19, a grounding resistor R20, a capacitor C17, a capacitor C18, a grounding capacitor C19 and a capacitor C20;

one end of the capacitor C20 is connected to the pin 7 of the single chip microcomputer chip U1, the other end of the capacitor C20 is connected to the ground resistor R16, one end of the resistor R17 and the base of the NPN type triode T3, the other end of the resistor R17 is connected to the pin 2 of the sliding resistor P1, the emitter of the NPN type triode T3 is connected to the ground resistor R20 and the ground capacitor C19, the collector of the NPN type triode T3 is connected to the cathode of the diode D1 and the base of the PNP type triode T2, the collector of the PNP type triode T2 is connected to the pin 8 of the single chip microcomputer chip U1 and the one end of the horn RL and grounded, the emitter of the PNP type triode T2 is connected to the pin 1 of the capacitor C18, the pin 3 of the diode D1, the pin 1 of the sliding resistor P1, the pin 3 of the sliding resistor P1, and the pin 3 of the capacitor C17, respectively, A pin 2 of the sliding resistor P2 is connected with an emitter of the NPN transistor T1, the other end of the capacitor C17 is connected with one end of the resistor R18 and one end of the resistor R19, the other end of the resistor R12 is connected with a pin 1 of the sliding resistor P2, a pin 3 of the sliding resistor P2 and a base of the NPN transistor T1, a collector of the NPN transistor T1 is connected with the other end of the resistor R19 and a 5V power supply, and the other end of the capacitor C18 is connected with the other end of the horn RL.

The utility model has the advantages that:

(1) the utility model discloses a two FM radio modules can realize outputting the audio frequency of main road frequency point signal in emergency broadcasting to collect reserve frequency point signal, in time switch over reserve frequency point signal output audio frequency when main road frequency point signal strength is low, reduce the effect that artificial intervention reaches only can control.

(2) The utility model discloses a two FM radios have the size little, very big reduction of cost, and it is provided with the audio frequency and amplifies the chip and can carry out the low distortion to the frequency point signal and enlarge, output audio frequency effect number.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of a central controller module.

FIG. 3 is a schematic diagram of a portion of an FM radio frequency modulation chip of a dual FM radio module.

FIG. 4 is a schematic diagram of a crystal oscillator portion of a dual FM radio module.

Fig. 5 is a pin diagram of the audio amplifier chip.

Fig. 6 is a schematic diagram of a power amplifier module.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all inventions contemplated by the present invention are protected.

As shown in figure 1 of the drawings, in which,

in an embodiment of the present invention, a dual FM radio includes a central controller module, a power amplifier module, and a dual FM radio module; the central controller module is respectively connected with the power amplifier module and the double FM radio modules;

the central controller module is used for collecting the frequency point signals and sending the frequency point signals to the power amplifier module, and the power amplifier module is used for outputting audio corresponding to the frequency point signals.

The type of the single chip microcomputer chip U1 is specifically STC89C 52.

As shown in fig. 2, the central controller module includes a single chip U1, a crystal oscillator Y1, a ground capacitor C1, a ground capacitor C2, a capacitor C3 and a ground resistor R1;

The central controller module can process main frequency point signals and standby frequency point signals sent by the double FM radio modules, can manually control or automatically select frequency point signals to send to the power amplifier module, and controls the power amplifier module to output audio corresponding to the signals.

The model of the FM radio frequency modulation chip U2 and the model of the FM radio frequency modulation chip U3 are both QN 8035-SANA.

As shown in fig. 3 to 4, the dual FM radio module further includes a crystal oscillator Y2, an inductor L1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a ground capacitor C4, a ground capacitor C5, a capacitor C6, a capacitor C7, a ground capacitor C8, a ground capacitor C9, a ground capacitor C10, a ground capacitor C11, a ground capacitor C12, a ground capacitor C13, a ground capacitor C14, a ground capacitor C15, and a ground capacitor C16;

The double FM radio modules are provided with FM radio frequency modulation chips U2 and FM radio frequency modulation chips U3, the signals collected by the FM radio frequency modulation chips U2 are used as main frequency point signals, the signals collected by the FM radio frequency modulation chips U3 are used as standby frequency point signals, the FM radio frequency modulation chips U2 are used for collecting frequency point signals of a set frequency band, the FM radio frequency modulation chips U3 continuously alternate other frequency point signals, and the FM radio frequency modulation chips are used for controlling and switching audio corresponding to the main frequency point signals and the standby frequency point signals by the central controller module.

As shown in fig. 5, the dual FM radio module is further provided with an audio amplifier chip U4, wherein the model of the audio amplifier chip is AZ4558 AM; and the No. 3 pin of the audio amplification chip U4 is respectively connected with the other end of the resistor R5 and the other end of the resistor R6.

As shown in fig. 6, the power amplifier module includes a horn RL, a sliding resistor P1, a sliding resistor P2, a diode D1, an NPN transistor T1, a PNP transistor T2, an NPN transistor T3, a ground resistor R16, a resistor R17, a resistor R18, a resistor R19, a ground resistor R20, a capacitor C17, a capacitor C18, a ground capacitor C19, and a capacitor C20;

The utility model discloses a system's working process does: main road frequency point signal and reserve frequency point signal are collected to two FM radio module, and send it to the central controller module, the central controller module sends main road frequency point signal to power amplifier module, the audio frequency that power amplifier module output corresponds, when the intensity of main road frequency point signal is crossed lowly, central controller module automatic switch sends reserve frequency point signal to power amplifier module output and corresponds the audio frequency, the user also can switch as required and send frequency point signal to power amplifier module output and correspond the audio frequency, realize the function of two FM radio intelligence output audio frequencies.

The utility model has the advantages that: the utility model discloses a two FM radio modules can realize outputting the audio frequency of main road frequency point signal in emergency broadcasting to collect reserve frequency point signal, in time switch over reserve frequency point signal output audio frequency when main road frequency point signal strength is low, reduce the effect that artificial intervention reaches only can control.

The utility model discloses a two FM radios have the size little, very big reduction of cost, and it is provided with the audio frequency and amplifies the chip and can carry out the low distortion to the frequency point signal and enlarge, output audio frequency effect number.

In the description of the present invention, it is to be understood that the terms "center", "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "radial", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or an implicit indication of the number of technical features. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.

Claims

1. A double-FM radio is characterized by comprising a central controller module, a power amplifier module and a double-FM radio module; the central controller module is respectively connected with the power amplifier module and the double FM radio modules;

2. The dual FM radio receiver of claim 1, wherein the central controller module comprises a single chip U1, a crystal Y1, a grounded capacitor C1, a grounded capacitor C2, a capacitor C3 and a grounded resistor R1;

wherein, No. 18 pins of singlechip chip U1 respectively with crystal oscillator Y1's one end and grounded capacitance C2 are connected, No. 19 pins of singlechip chip U1 respectively with crystal oscillator Y1's the other end and grounded capacitance C1 are connected, No. 9 pins of singlechip chip U1 respectively with grounded resistance R1 and capacitance C3's one end is connected, No. 31 pins of singlechip chip U1 and capacitance C3's the other end all is connected with the 5V power.

3. The dual FM radio receiver of claim 2, wherein the one-chip U1 is model number STC89C 52.

4. The dual FM radio of claim 3, wherein the FM radio FM chip U2 and the FM radio FM chip U3 are both QN 8035-SANA.

5. The dual FM radio receiver of claim 4, wherein the dual FM radio receiver module further comprises a crystal oscillator Y2, an inductor L1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a grounded capacitor C4, a grounded capacitor C5, a capacitor C6, a capacitor C7, a grounded capacitor C8, a grounded capacitor C9, a grounded capacitor C10, a grounded capacitor C11, a grounded capacitor C12, a grounded capacitor C13, a grounded capacitor C14, a grounded capacitor C15, and a grounded capacitor C16;

the pin 1 of the FM radio frequency modulation chip U2 is connected with one end of the grounded capacitor C4, the grounded capacitor C5 and the resistor R2 respectively, the other end of the resistor R2 is connected with a 3.3V power supply, the pin 4 and the pin 8 of the FM radio frequency modulation chip U2 are grounded, the pin 5 of the FM radio frequency modulation chip U2 is connected with the pin 5 of the FM radio frequency modulation chip U3 sequentially through the capacitor C6 and the capacitor C7, the pin 7 of the FM radio frequency modulation chip U2 is connected with one end of the resistor R11 through the resistor R4, and the pin 6 of the FM radio frequency modulation chip U2 is connected with a 3.3V power supply through the resistor R3; a pin 9 of the FM radio frequency modulation chip U2 is connected with a 3.3V power supply through the resistor R14, a pin 9 of the FM radio frequency modulation chip U2 is also connected with the grounding capacitor C15, a pin 10 of the FM radio frequency modulation chip U2 is connected with the 3.3V power supply through the resistor R15, and a pin 10 of the FM radio frequency modulation chip U2 is also connected with the grounding capacitor C16;

a pin 1 of the FM radio frequency modulation chip U3 is connected with one end of the grounded capacitor C8, the grounded capacitor C9 and one end of the resistor R7 respectively, the other end of the resistor R7 is connected with a 3.3V power supply, a pin 2 of the FM radio frequency modulation chip U3 is connected with one end of the resistor R5, and a pin 3 of the FM radio frequency modulation chip U3 is connected with one end of the resistor R6; the No. 4 pin and the No. 8 pin of the FM radio and frequency modulation chip U3 are both grounded, the No. 7 pin of the FM radio and frequency modulation chip U3 is connected with one end of the resistor R11 through the resistor R9, and the No. 6 pin of the FM radio and frequency modulation chip U3 is connected with a 3.3V power supply through the resistor R8; the pin 9 of the FM radio frequency modulation chip U3 is connected with a 3.3V power supply through the resistor R12, the pin 9 of the FM radio frequency modulation chip U3 is also connected with the grounded capacitor C13, the pin 10 of the FM radio frequency modulation chip U3 is connected with the 3.3V power supply through the resistor R13, and the pin 10 of the FM radio frequency modulation chip U3 is also connected with the grounded capacitor C14;

6. The dual FM radio receiver of claim 5, wherein the dual FM radio receiver module is further provided with an audio amplifier chip U4, the audio amplifier chip being specifically of type AZ4558 AM; and the No. 3 pin of the audio amplification chip U4 is respectively connected with the other end of the resistor R5 and the other end of the resistor R6.

7. The dual FM radio receiver of claim 5, wherein the power amplifier module comprises a horn RL, a sliding resistor P1, a sliding resistor P2, a diode D1, an NPN transistor T1, a PNP transistor T2, an NPN transistor T3, a grounding resistor R16, a resistor R17, a resistor R18, a resistor R19, a grounding resistor R20, a capacitor C17, a capacitor C18, a grounding capacitor C19 and a capacitor C20;