CN112669799A

CN112669799A - 4-path analog output circuit module for electronic guitar

Info

Publication number: CN112669799A
Application number: CN202011409644.8A
Authority: CN
Inventors: 赵少君
Original assignee: Shenzhen Daohe Industry Co ltd
Current assignee: Shenzhen Daohe Industry Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-04-16

Abstract

The invention discloses a 4-channel analog quantity output circuit module for an electronic guitar, which comprises a system chip, a power supply circuit, a radio module circuit, a clock circuit, a reset circuit, an alarm circuit, an LED indicator light circuit, an OLED display circuit, a BOOT circuit, a switch circuit, 4-channel analog quantity output circuit and a USB-to-serial port circuit, wherein the radio module circuit, the clock circuit, the reset circuit, the alarm circuit, the OLED display circuit, the BOOT circuit, the switch circuit, the 4-channel analog quantity output circuit and the USB-to-serial port circuit are in divergent connection by taking the system chip as a center, the LED indicator light circuit is connected with +3.3V voltage, and the power supply circuit adopts 5V voltage which is stabilized and filtered to +5V voltage and 3.3V voltage; the invention adopts the redundancy technology of the analog output circuit, improves the resolution of the A/D conversion chip, overcomes the problems of complex structure, high instability, large interference of output signals and the like of the existing circuit, and has good market prospect.

Description

4-path analog output circuit module for electronic guitar

Technical Field

The invention relates to the field of analog output control, in particular to a 4-path analog output circuit module for an electronic guitar.

Background

In daily life, analog quantity signals are important signals, such as controller frequency conversion, electronic organ, electronic guitar, light emitting lamp, power amplifier circuit and the like, analog quantity output influences the scale of the electronic organ, the higher the resolution of an A/D conversion chip in the sound equipment is, the clearer the sound is, the higher the resolution in the light emitting lamp is, the clearer and more stable the light source is, the smoother the waveform emitted out when the resolution is higher in the power amplifier circuit is, the farther the signal propagation distance is, the lower resolution chip is generally adopted by circuits in the existing equipment, and single-path output is adopted, so that the problem of unstable signal output is easily caused, when the signals are reflected in the power amplifier circuit, the circuits easily output sawtooth-shaped waveforms, the sawtooth-shaped waveforms are further amplified by the circuits, waveform distortion is easily caused, the transmission distance of the signals is influenced, in the sound equipment, the lower resolution output sound is noisy, the noise is more, and traditional analog output circuit adopts single output analog signal in addition, also receives the interference of accidental factor easily to influence analog signal's normal output.

Disclosure of Invention

In order to solve the problems, the invention adopts the redundancy technology of an analog output circuit, improves the resolution of an A/D conversion chip and solves the problems of complex circuit structure, high instability, large output signal interference and the like in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a4-channel analog output circuit module for an electronic guitar comprises a system chip, a power supply circuit, a radio module circuit, a clock circuit, a reset circuit, an alarm circuit, an LED indicator light circuit, an OLED display circuit, a BOOT circuit, a switch circuit, a 4-channel analog output circuit and a USB-to-serial port circuit, wherein the radio module circuit, the clock circuit, the reset circuit, the alarm circuit, the OLED display circuit, the BOOT circuit, the switch circuit, the 4-channel analog output circuit and the USB-to-serial port circuit are divergently connected by taking the system chip as a center, the LED indicator light circuit is connected with +3.3V voltage, and the power supply circuit adopts 5V voltage to reach +5V and 3.3V voltage through voltage stabilization and filtering.

Further, the BOOT circuit comprises a BOOT chip JP1, a 3-pin of the BOOT chip JP1 is connected with a BOOT0 pin of the system chip, a 4-pin of the BOOT chip JP1 is connected with a BOOT1 pin of the system chip, 1 and 2 pins of the BOOT chip JP1 are connected with 3.3V voltage, and 5 and 6 pins of the BOOT chip JP1 are grounded.

Furthermore, the clock circuit comprises crystal oscillators X1 and X2, two pins of the crystal oscillator X1 are respectively connected with

pins

5 and 6 of the system chip, and two pins of the crystal oscillator X2 are respectively connected with

pins

3 and 4 of the system chip. The reset circuit comprises a key SW1, a capacitor C1, a key SW1 and a capacitor C1 which are connected in parallel, two pins of the key SW1 are respectively grounded and have +3.3V voltage, and a pin of the key SW1 connected with the +3.3V voltage is connected with an NRST pin of the system chip.

Furthermore, the OLED display circuit comprises an OLED display screen and a capacitor, and pins CS, RST, D/C, D0 and D1 of the OLED display screen are respectively connected with pins PB11, PB12, PB13, PB14 and PB15 of the system chip.

Further, the radio module circuit comprises a wireless module NRF2401, wherein

pins

1 and 8 of the wireless module NRF2401 are grounded, a +3.3V voltage is connected, pins 2-7 are respectively connected with pins PC13, PC6, PC7, PA8, PC9 and PC8 of the system chip, the wireless module NRF2401 is internally provided with a frequency synthesizer, a power amplifier, a crystal oscillator and a modulator functional module, and an enhanced ShockBurst technology is fused, wherein the output power and a communication channel can be configured through a program, and a switch in a switch circuit is connected with a pin PA9 of the system chip.

Further, the alarm circuit comprises a buzzer B1 and a triode Q3, wherein the base electrode of the triode Q3 is connected with a PB10 pin of the system chip, the collector electrode of the triode Q3 is connected with +5V voltage, and the emitter electrode of the triode Q is connected with the buzzer.

A4-way analog output circuit module used for an electronic guitar according to claim 6, wherein the 4-way analog output circuit is composed of four signal output circuits with the same function, components and connection mode, the first signal output circuit comprises optocouplers U3, U4, U5, U6, U7, U9 and an AD conversion chip U2, the light emitter anodes of the optocouplers U3, U4, U5, U6, U7 and U9 are connected with 5V voltage, the cathodes of the optocouplers U2, PA1, PA0, PC0, PC1 and PC2 of the system chip are respectively connected with 5V voltage, the light receiver anodes of the optocouplers U3, U4, U5, U6, U7 and U9 are respectively connected with 5V voltage, the cathodes of the AD conversion chip U2 are grounded, the 3, 6, 7, 8, 9 and 10 pins of the AD conversion chip U3, U4, U5, U6, U7 and U9 are connected with a common analog output capacitor pin of the optical coupler, the second signal output capacitor C3614 is connected with a common ground, the second signal output capacitor C3614, the 24 pins are connected with +20V voltage, the 22 and 21 pins are connected with a series capacitor, the second signal output circuit comprises an optical coupler U, U and AD conversion chip U, the anode of a light emitter of the optical coupler U, U and U is connected with 5V voltage, the cathode is respectively connected with the PC, PB of the system chip, the anode of a light receiver of the optical coupler U, U and U is connected with 5V voltage, the cathode is grounded, the 3, 6, 7, 8, 9 and 10 pins of the AD conversion chip U are connected with the anodes of the optical couplers U, U and U light receivers, 19 pins output analog signals, 14 and 15 pins are commonly connected with the first pin of the capacitor C, 16 pins are connected with ground and the second pin of the capacitor C, 24 pins are connected with +20V voltage, the 22 and 21 pins are connected with the series capacitor, and the third signal output circuit comprises the optical coupler U, u19, U20, U21, U23 and AD conversion chip U14, light emitter anode of light coupler U17, U18, U19, U20, U21 of the system chip is connected with 5V voltage, cathode is respectively connected with PB 21, PA 21 of the system chip, light receiver anode of light coupler U21, U21 is connected with 5V voltage, cathode is grounded, 3, 6, 7, 8, 9, 10 pin of AD conversion chip U21 is connected with anode of light coupler U21, U21 light receiver, 19 pin outputs analog signal, 14, 15 pin is connected with first pin of capacitor C21, 16 pin is connected with ground and connected with second pin of capacitor C21, 24 is connected with +20V voltage, U21, 24 pin is connected with +20V voltage, U3621 and four pins of light emitter are connected with U21, the light emitter anode of light coupler U21, U21 is connected with light emitter anode of light coupler U21, cathode is connected with light emitter anode of the AD conversion chip 21, U21, the cathodes of the light receivers of the PA4, PA5, PA6, PA7, PC4 and PC5, the optical couplers U24, U25, U26, U27, U28 and U29 of the system chip are respectively connected with 5V voltage, the cathodes of the light receivers are grounded,

pins

3, 6, 7, 8, 9 and 10 of the AD conversion chip U22 are connected with the anodes of the optical couplers U24, U25, U26, U27, U28 and U29, a pin 19 outputs an analog signal,

pins

14 and 15 are commonly connected with a first pin of a capacitor C30, a pin 16 is connected with ground and connected with a second pin of the capacitor C30, a pin 24 is connected with +20V voltage, and a capacitor is connected in series between the

pins

22 and 21.

Further, the AD conversion chip model is AD 5420.

Furthermore, 1 pin of the USB interface of the USB-to-serial port circuit is connected with +5V voltage and provides +5V voltage for the power circuit, 2 pins of the USB interface are connected with 6 pins of the port switching chip, 3 pins of the USB interface are connected with +3.3V voltage and 5 pins of the port switching chip, 4 pins of the USB interface are vacant, and 5 pins of the USB interface are grounded.

The invention has the beneficial effects that: the four-path analog quantity output circuit can enable output signals to be more stable and reliable by adopting a redundancy technology, the AD5420 chip is adopted to have 16-bit resolution, the higher the resolution is, the more stable and smooth the output signals can be achieved, and the output of analog quantity can be more continuous by converting the output signals into analog quantity.

Drawings

FIG. 1, OLED display circuit, wireless module circuit, switch circuit, alarm circuit;

FIG. 2 is a partial enlarged view of an LED indicator light circuit, a BOOT circuit, a clock circuit, a reset circuit and a system chip;

FIG. 3 shows a USB to serial circuit;

FIG. 4, a first signal output circuit, a second signal output circuit;

fig. 5, a third signal output circuit, and a fourth signal output circuit.

Detailed Description

In order to facilitate an understanding of the invention, the above description is given in more detail in connection with the accompanying drawings and the specific embodiments. The preferred embodiments of the present invention are shown in the drawings, but the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The implementation mode is as follows:

power supply circuit adopts 5V voltage, through the steady voltage, the filtering obtains 5V and 3.3V voltage, wireless module circuit can be with reaching the host computer on the signal of gathering, clock circuit provides clock signal for the system, alarm circuit can indicate operating condition, there is the prompt tone after analog signal transmission accomplishes, LED pilot lamp circuit can indicate circuit operating condition, OLED display circuit can show 4 way analog signal circuit input states, BOOT start-up mode can be selected to the BOOT circuit, switch circuit can open or close signal transmission passageway.

The strings are stirred, after the strings vibrate, sound is produced, the sound is subjected to resonance, amplification and conduction through the neck and the body, then is picked up by a pickup and converted into a level signal, and enters an I/O port of a main control chip STM32F103 ZET6 for processing; the circuit is provided with 4 signal output circuits, the signal circuits adopt a redundancy technology to enhance the sound stability, the first signal output circuit and the second signal output circuit are normally open, the third signal output circuit and the fourth signal output circuit are normally closed as redundancy signals, and when the normally open circuit has a fault, a standby circuit is immediately started to ensure the sound output to be stable; first signal output circuit and second signal output circuit are a set of and are located two stereo set departments about being located respectively, third signal output circuit and fourth signal output circuit are a set of and are located two stereo set departments about being located respectively, through cutting the magnetic induction line through the string when the bullet is sung and be the current signal with magnetic signal conversion, the speed of singing is faster, it is stronger to convert current signal after cutting the magnetic induction line, the sound decibel number that gives the stereo set is then big more, can adjust sound output size through the button simultaneously, avoid damaging the stereo set because of the dynamics of singing is too big.

Claims

1. A4-channel analog quantity output circuit module for an electronic guitar is characterized by comprising a system chip, a power supply circuit, a radio module circuit, a clock circuit, a reset circuit, an alarm circuit, an LED indicator light circuit, an OLED display circuit, a BOOT circuit, a switch circuit, a 4-channel analog quantity output circuit and a USB-to-serial port circuit, wherein the radio module circuit, the clock circuit, the reset circuit, the alarm circuit, the OLED display circuit, the BOOT circuit, the switch circuit, the 4-channel analog quantity output circuit and the USB-to-serial port circuit are divergently connected by taking the system chip as a center, the LED indicator light circuit is connected with +3.3V voltage, and the power supply circuit adopts 5V voltage which is stabilized and filtered to +5V voltage and 3.3V voltage.

2. The module of claim 1, wherein the BOOT circuit comprises a BOOT chip JP1, a3 pin of the BOOT chip JP1 is connected to a BOOT0 pin of the system chip, a4 pin of the BOOT chip JP1 is connected to a BOOT1 pin of the system chip, a1 pin and a2 pin of the BOOT chip JP1 are connected to a 3.3V voltage, and a5 pin and a6 pin of the BOOT chip JP1 are grounded.

3. The module of claim 2, wherein the clock circuit comprises crystal oscillators X1, X2, two pins of the crystal oscillator X1 are respectively connected to pins 5 and 6 of the system chip, two pins of the crystal oscillator X2 are respectively connected to pins 3 and 4 of the system chip;

the reset circuit comprises a key SW1 and a capacitor C1, the key SW1 and the capacitor C1 are connected in parallel, two pins of the key SW1 are respectively grounded and have +3.3V voltage, and the pin of the key SW1 connected with the +3.3V voltage is connected with the NRST pin of the system chip.

4. The module of claim 3, wherein the OLED display circuit comprises an OLED display panel and a capacitor, and the CS pins, RST pins, D/C, D0 pins and D1 pins of the OLED display panel are respectively connected to the PB11 pins, PB12 pins, PB13 pins, PB14 pins and PB15 pins of the system chip.

5. The module of claim 4, wherein the radio module circuit comprises a wireless module NRF2401, the wireless module NRF2401 has pins 1 grounded, pins 8 connected with +3.3V voltage, pins 2-7 connected with pins PC13, PC6, PC7, PA8, PC9, and PC8 of the system chip, the wireless module NRF2401 has built-in frequency synthesizer, power amplifier, crystal oscillator, modulator function module, and incorporates enhanced ShockBurst technology, wherein the output power and communication channel can be configured by program, and the switch in the switch circuit is connected with the PA9 pin of the system chip.

6. The module of claim 5, wherein the alarm circuit comprises a buzzer B1, a transistor Q3, a base of the transistor Q3 is connected to a PB10 pin of the system chip, a collector is connected to +5V voltage, and an emitter is connected to a buzzer.

7. A4-way analog output circuit module for an electronic guitar according to claim 6, wherein the 4-way analog output circuit is composed of four signal output circuits with the same function, components and connection mode, the first signal output circuit includes an optical coupler U3, U3 and an AD conversion chip U3, the light emitter anode of the optical coupler U3, U3 and U3 is connected with 5V voltage, the cathode is respectively connected with PA3, PC3 and PC3 of the system chip, the light receiver anode of the optical coupler U3, U3 and U3 is connected with 5V voltage, the cathode is grounded, the pins 3, 6, 7, 8, 9 and 10 of the AD conversion chip U3 are connected with the light receiver pins 3, U3 and U3 of the optical coupler U3, the first analog output capacitor C3614 of the AD conversion chip U3614, the light receiver pins 3614 and the common pins 3614 of the AD conversion chip U3, the pin 16 is connected to the ground and connected with the second pin of the capacitor C21, the pin 24 is connected to the +20V voltage, the capacitor is connected in series between the pins 22 and 21, the second signal output circuit comprises opto-couplers U10, U11, U12, U13, U13, U15 and an AD conversion chip U8, anodes of light emitters of the opto-couplers U10, U11, U12, U13, U13 and U15 are connected to the voltage of 5V, cathodes of the opto-couplers U3, PB3, PB4, PB5, PB6 and PB7 of the system chip are respectively connected, anodes of light receivers of the opto-couplers U10, U11, U12, U13, U13 and U15 are connected to the voltage of 5V, cathodes of the opto-receivers are grounded, pins 3, 6, 7, 8, 9 and 10 of the AD conversion chip U8 are connected to the pins U10, U11, U12, the pins of the light receivers of the AD conversion chip U8 are connected to the voltage of the first pin 3614, the analog signal output and the first pin 3614 is connected to the common pin 3614, the first pin 3614 is connected to the anode of the analog capacitor, 22 and 21 pins are connected with a capacitor in series, a third signal output circuit comprises optocouplers U17, U18, U19, U20, U21 and U23 and an AD conversion chip U14, anodes of light emitters of the optocouplers U17, U18, U19, U20, U21 and U23 are connected with 5V voltage, cathodes of the optocouplers U17, U18, U19, U20, U21 and U23 are respectively connected with PB8, PB9, PB0, PB1, PB2 and PA3 of the system chip, anodes of light receivers of the optocouplers U17, U18, U19, U20, U21 and U23 are connected with 5V voltage and cathodes of the optocouplers are grounded, pins 3, 6, 7, 8, 9 and 10 of the AD conversion chip U14 are connected with the optocouplers U17, U18, U19, U20, pins of the light receivers of the U20 are connected with an analog signal output, pins of a first pin 14 and a pin 15 are connected with a capacitor C72 in common, a pin of the capacitor C16 is connected with a fourth pin 3621, and a fourth pin of the optocoupler is connected with a capacitor V3621 and, U25, U26, U27, U28, U29 and AD conversion chip U22, the light emitter anode of the optical coupler U24, U25, U26, U27, U28, U29 is connected with 5V voltage, the cathode is respectively connected with PA4, PA5, PA6, PA7, PC4, PC5 of the system chip, the light receiver anode of the optical coupler U24, U25, U26, U27, U28, U29 is connected with 5V voltage, the cathode is grounded, the pins 3, 6, 7, 8, 9, 10 of the AD conversion chip U22 are connected with the anode of the optical coupler U24, U25, U26, U27, U28, U29, the pins 19 output analog signals, the pins 14, 15 are connected with the first pin of the capacitor C30, the pin 16 is connected with ground and connected with the second pin of the capacitor C30, the pins 24, 20 and 21 are connected with the capacitor in series.

8. The module of claim 7, wherein the model of the AD conversion chip is AD5420, and the model of the system chip is STM32F103 RE.

9. The module of claim 8, wherein 1 pin of the USB interface of the USB to serial circuit is connected to +5V and provides +5V for the power circuit, 2 pins of the USB interface are connected to 6 pins of the switching chip, 3 pins of the USB interface are connected to +3.3V and 5 pins of the switching chip, 4 pins of the USB interface are left empty, and 5 pins of the USB interface are grounded.