CN203691616U

CN203691616U - Music playback circuit

Info

Publication number: CN203691616U
Application number: CN201420009050.1U
Authority: CN
Inventors: 张玉凤; 李录锋; 戚海永
Original assignee: Jiangsu Institute of Architectural Technology
Current assignee: Jiangsu Institute of Architectural Technology; Jiangsu Jianzhu Institute
Priority date: 2014-01-07
Filing date: 2014-01-07
Publication date: 2014-07-02
Anticipated expiration: 2024-01-07

Abstract

The utility model discloses a music playback circuit, comprising a beat control circuit, a D/A converting circuit, an audio frequency generation circuit, and an audio frequency amplification circuit, wherein the beat control circuit comprises a power supply VCC, a memory chip EEPROM2864, an adding counter 74LS163I, an adding counter 74LS163II, a NAND gate 74LS00, a timer NE555, a resistor R1, a potentiometer R2, a capacitor C1, and a capacitor C2; and the audio frequency generation circuit comprises a voltage frequency converter LM331, an adding counter 74LS163III, a power supply VCC, a capacitor C3, a capacitor Ct, a capacitor CL, a resistor R6, a resistor R7, a potentiometer R8, a resistor R9, a potentiometer R10, a resistor R11, a resistor Rt, and a resistor RL. The beneficial effects are that the music playback circuit is simple in principle, easy to design, and convenient to master, and the music playback circuit is capable of realizing repeated playback of music.

Description

Music playback circuit

Technical field

The utility model relates to a kind of circuit, specifically a kind of music playback circuit.

Background technology

Upgrade in electronic technology life, constantly conversion, the widely used epoch of computer programming language, study for circuit is absolutely necessary, people also can be different according to the Demand Design of self circuit, when people come off duty go back home after, be full of from head to foot tired out, music often can be alleviated this tired out, at present a variety of about being designed with of music playing system, especially SCM Based music playing system, system comprises performance loud speaker, selected songs, play and show several parts, the musical performance controller of design is the square wave that produces different frequency by the timer of control single chip computer inside, drive loud speaker to send the sound of different syllables, recycling postpones to control the length of tone period, control the beat in tone, button is set simultaneously makes designed program can between five songs, carry out selected songs, design display makes it show song sequence number, but the theory and design complexity of this SCM Based music playing system, be unfavorable for grasping, can not realize popular.

Summary of the invention

The problem existing for above-mentioned prior art, the utility model provides a kind of music playback circuit, and principle is simple, easily design, more convenient grasp.

To achieve these goals, the technical solution adopted in the utility model is: a kind of music playback circuit, comprises rhythm control circuit, D/A change-over circuit, audio producing circuit and audio amplifier circuit:

Described rhythm control circuit comprises power supply VCC, storage chip EEPROM2864, up counter 74LS163I, up counter 74LS163II, NAND gate 74LS00, timer NE555, resistance R 1, potentiometer R2, capacitor C 1 and capacitor C 2, the pin two of storage chip EEPROM2864, the pin two 0 of storage chip EEPROM2864 is to the equal ground connection of pin two 5, the pin one of power supply VCC and storage chip EEPROM2864, the pin two 7 of storage chip EEPROM2864 connects, the pin one 0 of storage chip EEPROM2864 is connected with the pin one 4 of up counter 74LS163I, the pin 9 of storage chip EEPROM2864, the pin one 3 of up counter 74LS163I is connected with the pin one of NAND gate 74LS00, the pin 8 of storage chip EEPROM2864 is connected with the pin one 2 of up counter 74LS163I, the pin 7 of storage chip EEPROM2864 is connected with the pin one 1 of up counter 74LS163I, the pin 6 of storage chip EEPROM2864 is connected with the pin one 4 of up counter 74LS163II, the pin 5 of storage chip EEPROM2864 is connected with the pin one 3 of up counter 74LS163II, the pin 4 of storage chip EEPROM2864, the pin one 2 of up counter 74LS163II is connected with the pin two of NAND gate 74LS00, the pin 3 of storage chip EEPROM2864 is connected with the pin one 1 of up counter 74LS163II, the pin 3 of up counter 74LS163I is to the pin 3 of pin 6 and up counter 74LS163II to the equal ground connection of pin 6, the pin one of power supply VCC and up counter 74LS163I, the pin 7 of up counter 74LS163I, the pin one 0 of up counter 74LS163I, the pin one of up counter 74LS163II, the pin 7 of up counter 74LS163II, the pin one 0 of up counter 74LS163II connects, the pin one 5 of up counter 74LS163I is connected with the pin two of up counter 74LS163II, the pin 3 of NAND gate 74LS00 and the pin 9 of up counter 74LS163I, the pin 9 of 74LS163II connects, the pin 3 of the pin two of up counter 74LS163I and timer NE555 is connected, the pin 5 of timer NE555 is connected with one end of capacitor C 2, the other end of capacitor C 2 is connected with one end of capacitor C 1, the other end of capacitor C 1 is connected with the pin two of timer NE555, the pin 6 of timer NE555, one end of potentiometer R2, the adjustable potential end of potentiometer R2 is connected with the pin 7 of the other end of potentiometer R2, timer NE555, one end of resistance R 1, and power supply VCC is connected with the other end of resistance R 1, the pin 4 of timer NE555, the pin 8 of timer NE555,

Described D/A change-over circuit comprises D/A conversion integrated chip DAC0832, power supply VCC, operational amplifier LM324, voltage stabilizing didoe DW, resistance R 3, resistance R 4 and resistance R 5, power supply VCC is connected with one end of resistance R 3, the pin 7 of D/A conversion integrated chip DAC0832 and the pin one 1 of storage chip EEPROM2864 are connected, the pin 6 of D/A conversion integrated chip DAC0832 and the pin one 2 of storage chip EEPROM2864 are connected, the pin 5 of D/A conversion integrated chip DAC0832 and the pin one 3 of storage chip EEPROM2864 are connected, the pin 4 of D/A conversion integrated chip DAC0832 and the pin one 5 of storage chip EEPROM2864 are connected, the pin one 6 of D/A conversion integrated chip DAC0832 and the pin one 6 of storage chip EEPROM2864 are connected, the pin one 5 of D/A conversion integrated chip DAC0832 and the pin one 7 of storage chip EEPROM2864 are connected, the pin one 4 of D/A conversion integrated chip DAC0832 and the pin one 8 of storage chip EEPROM2864 are connected, the pin one 3 of D/A conversion integrated chip DAC0832 and the pin one 9 of storage chip EEPROM2864 are connected, the other end of resistance R 3 is connected with the pin one 9 of D/A conversion integrated chip DAC0832, the pin 9 of D/A conversion integrated chip DAC0832 and the pin one of operational amplifier LM324, one end of resistance R 5 connects, the pin one 1 of D/A conversion integrated chip DAC0832 is connected with the pin two of operational amplifier LM324, the pin one 2 of D/A conversion integrated chip DAC0832 and pin 3 ground connection of operational amplifier LM324, connect+5V of pin one 1 power supply of operational amplifier LM324, the pin 4 of operational amplifier LM324 meets power supply VCC, the pin two of the pin one of D/A conversion integrated chip DAC0832 and D/A conversion integrated chip DAC0832, the pin one 7 of D/A conversion integrated chip DAC0832, the pin one 8 of D/A conversion integrated chip DAC0832 is connected with the negative pole of voltage stabilizing didoe DW and ground connection, the pin 8 of the positive pole of voltage stabilizing didoe DW and D/A conversion integrated chip DAC0832, one end of resistance R 4 connects, another termination-5V power supply of resistance R 4,

Described audio producing circuit comprises voltage to frequency converter LM331, up counter 74LS163III, power supply VCC, capacitor C 3, capacitor C t, capacitor C L, resistance R 6, resistance R 7, potentiometer R8, resistance R 9, potentiometer R10, resistance R 11, resistance R t and resistance R L, the pin 6 of the pin one of voltage to frequency converter LM331 and voltage to frequency converter LM331, one end of capacitor C L, one end of resistance R L connects, the other end of the other end of capacitor C L and resistance R L, one end of resistance R 6, one end of resistance R 7 connects, the other end ground connection of resistance R 6, the other end of resistance R 7 is connected with the adjustable potential end of potentiometer R8, a termination power VCC of potentiometer R8, another termination-5V power supply of potentiometer R8, the pin two of voltage to frequency converter LM331 is connected with one end of resistance R 9, one end of the other end of resistance R 9 and potentiometer R10, the adjustable potential end of potentiometer R10 connects, the other end ground connection of potentiometer R10, the pin 3 of voltage to frequency converter LM331 and one end of resistance R 11, the pin two of up counter 74LS163III connects, the other end of resistance R 11 and power supply VCC, one end of resistance R t connects, the pin 5 of the other end of resistance R t and voltage to frequency converter LM331, one end of capacitor C t connects, one end ground connection of the other end of capacitor C t and capacitor C 3, the other end of capacitor C 3 respectively with the pin 7 of voltage to frequency converter LM331, the other end of resistance R 5 connects, and the pin 3 of up counter 74LS163III is to the equal ground connection of pin 6, the pin one of up counter 74LS163III, the pin 7 of up counter 74LS163III, the pin 9 of up counter 74LS163III and the pin one 0 of up counter 74LS163III meet power supply VCC,

Described audio amplifier circuit comprises power amplifier LM386, capacitor C 5, electrochemical capacitor C6, potentiometer R12 and loud speaker B, one end of the pin two of power amplifier LM386 and potentiometer R12, the pin 4 of power amplifier LM386, one end of loud speaker B connects and ground connection, the pin 3 of power amplifier LM386 is connected with the adjustable potential end of potentiometer R12, the other end of potentiometer R12 is connected with one end of capacitor C 5, the pin one 2 of the other end of capacitor C 5 and up counter 74LS163III is connected, the pin 6 of power amplifier LM386 is connected with power supply VCC, the pin 5 of power amplifier LM386 is connected with the positive pole of electrochemical capacitor C6, the negative pole of electrochemical capacitor C6 is connected with the other end of loud speaker B.

Further, described power supply VCC is+5V power supply.

Further, described loud speaker B selects the loud speaker of 15M-05-38BFK model.

The beneficial effects of the utility model are: principle is simple, and easily design is convenient for people to grasp, and can realize music and play back and forth.

Brief description of the drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in Figure 1, a kind of music playback circuit, comprises rhythm control circuit, D/A change-over circuit, audio producing circuit and audio amplifier circuit:

Power supply VCC is+5V power supply.

Loud speaker B selects the loud speaker of 15M-05-38BFK model.

The course of work: in D/A change-over circuit, the reference voltage of D/A conversion integrated chip DAC0832 is-3V, by voltage stabilizing didoe, DW provides, by the about 10mA of electric current of voltage stabilizing didoe DW, so resistance R 4 is 200 Europe, the control voltage of exporting in D/A change-over circuit is 0V to 3V; Audio producing circuit is made up of voltage controlled oscillator and eight frequency counters, voltage controlled oscillator acp chip is voltage to frequency converter LM331, eight frequency counters are made up of up counter 74LS163III, determine the control voltage of voltage controlled oscillator according to the frequency of note; Rhythm control circuit is made up of low frequency multi-resonant oscillating circuit, up counter 74LS163I, up counter 74LS163II and ROM, and ROM is made up of EEPROM2864 memory.Adopt voltage controlled oscillator, determine the control voltage of voltage controlled oscillator according to the frequency of note, and this voltage can be obtained through D/A change-over circuit by the numerical value of note frequency in ROM, be that numerical value leaves in ROM by note frequency inverted, low-frequency oscillator and up counter 74LS163I, the address that up counter 74LS163II forms ROM drives, make the change along with the time, location contents different in ROM are read out, through D/A change-over circuit, voltage to frequency converter LM331 is converted to the note of different frequencies, the cycle of low-frequency oscillator is the minimum pitch time of note.Suitably arrange the numerical value in ROM, can obtain different melodies, finally play music by audio amplifier circuit.

Claims

1. a music playback circuit, is characterized in that, comprises rhythm control circuit, D/A change-over circuit, audio producing circuit and audio amplifier circuit:

2. according to a kind of music playback circuit described in claim 1, it is characterized in that, described power supply VCC is+5V power supply.

3. according to a kind of music playback circuit described in claim 1 or 2, it is characterized in that, described loud speaker B selects the loud speaker of 15M-05-38BFK model.