Motor control volume tuning circuit

Abstract

The utility model relates to audio volume adjusting technical field discloses a motor control volume adjusting circuit with better reliability, including the main control module for output at least one way control signal, first drive circuit (110), second drive circuit (120) and volume adjusting circuit (130), wherein, when one way control signal of main control module output is low level, and the other way control signal is high level, or when one way control signal of main control module output is high level, and the other way control signal is low level, volume adjusting circuit (130) is controlled action, to adjust the state of output audio volume.

Description

Technical Field

[0001] This utility model relates to the field of audio volume adjustment technology, and more specifically, to a motor-controlled volume adjustment circuit. Background Technology

[0002] Tuning circuits typically use the position of the fader on a sliding potentiometer to control volume. The sliding potentiometer is controlled by a motor. In current tuning circuits, the motor cannot provide a precise control signal to the sliding potentiometer. Therefore, it is difficult to accurately adjust the fader when changing scenes, resulting in poor tuning effect. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a motor control volume adjustment circuit with better reliability, which addresses the shortcomings of the prior art, such as the difficulty in accurately adjusting the fader during scene changes, resulting in poor sound tuning effect.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a motor control volume adjustment circuit, which has the following features: The main control module is used to output at least one control signal; The first driving circuit has its signal input terminal coupled to a signal output terminal of the main control module, and is used to receive one of the control signals. The second driving circuit has its signal input terminal coupled to another signal output terminal of the main control module, and is used to receive another control signal. The tuning circuit has its first terminal connected to the output terminal of the first driving circuit. The second terminal of the tuning circuit is connected to the output terminal of the second driving circuit; When one of the control signals output by the main control module is low and the other control signal is high, or When one of the control signals output by the main control module is at a high level and the other control signal is at a low level... The tuning circuit is controlled to adjust the output audio volume.

[0005] In some implementations... The tuning circuit includes at least a motor and a dual potentiometer connected in parallel. The first end of the motor is connected to the output end of the second drive circuit. The second end of the motor is connected to the output end of the first drive circuit. When one of the control signals output by the main control module is at a low level and the other control signal is at a high level, the motor is controlled to rotate forward or in reverse, and the resistance of the dual potentiometer is controlled to decrease or increase, so as to increase or decrease the volume of the output audio. When one of the control signals output by the main control module is at a high level and the other control signal is at a low level, the motor is controlled to rotate in reverse or forward, and the resistance of the dual potentiometer is controlled to increase or decrease, so as to decrease or increase the volume of the output audio.

[0006] In some embodiments, the tuning circuit further includes a first capacitor. One end of the first capacitor is connected to the first end of the motor. The other end of the first capacitor is connected to the second end of the motor.

[0007] In some implementations, the first driving circuit and the second driving circuit are connected in parallel.

[0008] In some embodiments, the first driving circuit includes at least a first transistor and a third transistor connected in series. The base of the first transistor is connected to the +5V power supply terminal through the first resistor. The emitter of the first transistor is connected to the +5V power supply terminal. The bases of the first transistor and the third transistor are connected to another signal output terminal of the main control module via a third resistor and a fifth resistor connected in series, for receiving another control signal. The collectors of the first transistor and the third transistor are connected to the first terminal of the tuning circuit. The emitter of the third transistor is connected to the common terminal.

[0009] In some implementations, the first transistor is selected as a PNP transistor. The third transistor is selected as an NPN transistor.

[0010] In some embodiments, the second driving circuit includes at least a second transistor and a fourth transistor connected in series. The base of the second transistor is connected to the +5V power supply terminal through the second resistor. The emitter of the second transistor is connected to the +5V power supply terminal. The bases of the second and fourth transistors are connected to a signal output terminal of the main control module via a fourth and a sixth resistor connected in series, for receiving one of the control signals. The collectors of the second and fourth transistors are connected to the second terminal of the tuning circuit. The emitter of the fourth transistor is connected to the common terminal.

[0011] In some implementations, the second transistor is selected as a PNP transistor. The fourth transistor is selected as an NPN transistor.

[0012] In some embodiments, a second capacitor and a third capacitor connected in parallel are also included. One end of the second capacitor and one end of the third capacitor are connected to the +5V power supply terminal. The other end of the second capacitor and the third capacitor are connected to a common terminal.

[0013] The motor-controlled volume adjustment circuit of this invention includes a main control module for outputting at least one control signal, a first drive circuit, a second drive circuit, and a tuning circuit. When one control signal output by the main control module is low and another control signal is high, or when one control signal output by the main control module is high and another control signal is low, the tuning circuit is activated to adjust the output audio volume. Compared with existing technologies, by using the first and second drive circuits to correspond to the working state of the tuning circuit, the tuning circuit can adjust the volume output of the left and right channel audio signals, thereby adjusting the volume level. This effectively solves the problem of inaccurate fader adjustment during scene transitions, leading to poor tuning effects. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a circuit diagram of an embodiment of the motor control volume adjustment circuit provided by this utility model. Detailed Implementation

[0015] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0016] like Figure 1 As shown, in the first embodiment of the motor control volume adjustment circuit of this utility model, the motor control volume adjustment circuit 10 includes a main control module (not shown), a first drive circuit 110, a second drive circuit 120 and a tuning circuit 130. The main control module (not shown) is responsible for logic operations, signal processing, and control signal output. The first drive circuit 110 has the functions of switching and triggering; The second drive circuit 120 has the functions of switching and triggering; The tuning circuit 130 has the function of adjusting the volume of the audio signal; Specifically, the main control module is used to output at least one control signal (high level / low level). The signal input terminal of the first drive circuit 110 is coupled to a signal output terminal (corresponding to MOTOR-A) of the main control module, and is used to receive a control signal (MOTOR-A). The input control signal (MOTOR-A) is used to control the working state of the first drive circuit 110. Furthermore, the signal input terminal of the second drive circuit 120 is connected to another signal output terminal (corresponding to MOTOR-B) of the main control module to receive another control signal (MOTOR-B). The other control signal (MOTOR-B) is used to control the working state of the second drive circuit 120. Specifically, the first terminal of the tuning circuit 130 is connected to the output terminal of the first driving circuit 110, and is used to receive the voltage signal (corresponding to +5V) input when the first driving circuit 110 is controlled to be turned on. The second terminal of the tuning circuit 130 is connected to the output terminal of the second driving circuit 120, and is used to receive the voltage signal (corresponding to +5V) input when the second driving circuit 120 is controlled to be turned on. Specifically, when one control signal (MOTOR-A) output by the main control module is low and the other control signal (MOTOR-B) is high, or When one control signal (MOTOR-A) output by the main control module is high and the other control signal (MOTOR-B) is low, The tuning circuit 130 is controlled to adjust the volume of the output left and right channel audio signals (increase / decrease).

[0017] Using this technical solution, the working states of the first driving circuit 110 and the second driving circuit 120 corresponding to the tuning circuit 130 enable the tuning circuit 130 to adjust the volume output of the left and right channel audio signals, thereby adjusting the volume. This effectively solves the problem that it is difficult to accurately adjust the fader when changing scenes, resulting in poor tuning effect.

[0018] In some implementations, to ensure the stability of motor M control, the first drive circuit 110 and the second drive circuit 120 can be connected in parallel to form an H-bridge drive circuit. By controlling the on / off state of different bridge arms, the voltage polarity or current path at both ends of motor M can be changed, thereby realizing forward and reverse rotation and speed regulation of motor M.

[0019] In some implementations, to ensure the reliability of volume adjustment of the output audio signal, a motor M and a dual potentiometer VR1 can be provided in the tuning circuit 130. The resistance of the circuit can be changed by controlling the forward or reverse rotation of the motor M to slide the contacts of the dual potentiometer VR1, thereby adjusting the attenuation of the left channel (L) and right channel (R) audio signals and realizing volume control. Specifically, motor M is connected in parallel with dual potentiometer VR1, that is, the first terminal of motor M (corresponding to M+) is connected to one terminal of dual potentiometer VR1 (corresponding to pins 10, 4, and 1). The second end of motor M (corresponding to M-) is connected to the other end of the dual potentiometer VR1 (corresponding to pins 9, 6 and 3); Furthermore, the first end of the motor M (corresponding to M+) is connected to the output end of the second drive circuit 120 to receive the voltage signal input when the second drive circuit 120 is controlled to be turned on; The second end of motor M (corresponding to M-) is connected to the output end of the first drive circuit 110 to receive the voltage signal input when the first drive circuit 110 is controlled to be turned on; Specifically, when one control signal (MOTOR-A) output by the main control module is low and the other control signal (MOTOR-B) is high, the motor M is controlled to rotate forward or reverse, and the resistance of the dual potentiometer VR1 is controlled to decrease or increase, so as to increase or decrease the volume of the output audio. When one control signal (MOTOR-A) output by the main control module is high and the other control signal (MOTOR-B) is low, the motor M is controlled to rotate in reverse or forward, and the resistance of the dual potentiometer VR1 is controlled to increase or decrease to reduce or increase the volume of the output audio.

[0020] In some implementations, in order to suppress the interference generated by the motor M and ensure the purity of the audio signal, a first capacitor C101 can be set in the tuning circuit 130, with a capacitance value of 0.1μ. It is used to filter out the high-frequency interference generated when the motor M is working, so as to avoid affecting the audio signal. Specifically, one end of the first capacitor C101 is connected to the first terminal (corresponding to M+) of the motor M. The other end of the first capacitor C101 is connected to the second end (corresponding to M-) of the motor M.

[0021] In some implementations, to ensure the reliability of motor M control, a first transistor Q101 and a third transistor Q103 can be provided in the first drive circuit 110. In this configuration, the first transistor Q101 and the third transistor Q103 are connected in series to form one bridge arm. The first transistor Q101 is selected as a PNP type transistor, and the third transistor Q103 is selected as an NPN type transistor, both of which have switching functions; Specifically, the base of the first transistor Q101 is connected to the +5V power supply terminal through the first resistor R101, where the first resistor R101 is a pull-up resistor. The emitter of the first transistor Q101 is connected to the +5V power supply. The base of the first transistor Q101 and the base of the third transistor Q103 are connected to another signal output terminal of the main control module (corresponding to MOTOR-B) through the third resistor R103 and the fifth resistor R105 connected in series, for receiving another control signal (MOTOR-B). The collectors of the first transistor Q101 and the third transistor Q103 are connected to the first terminal of the tuning circuit 130. The base of the third transistor Q103 is connected to the common terminal through the seventh resistor R107. The emitter of the third transistor Q103 is connected to the common terminal; A fourth capacitor C104 is placed between the collector and emitter of the third transistor Q103 to filter out high-frequency noise in the power supply or signal.

[0022] In some implementations, to ensure the reliability of motor M control, a second transistor Q102 and a fourth transistor Q104 can be provided in the second drive circuit 120. In this configuration, the second transistor Q102 and the fourth transistor Q104 are connected in series to form another bridge arm. The second transistor Q102 is a PNP transistor, and the fourth transistor Q104 is an NPN transistor, both of which have switching functions; Specifically, the base of the second transistor Q102 is connected to the +5V power supply terminal through the second resistor R102, where the second resistor R102 is a pull-up resistor. The emitter of the second transistor Q102 is connected to the +5V power supply. The base of the second transistor Q102 is connected to the base of the fourth transistor Q104 through the fourth resistor R104 and the sixth resistor R106 connected in series. The bases of the second transistor Q102 and the fourth transistor Q104 are connected to a signal output terminal (corresponding to MOTOR-A) of the main control module through the fourth resistor R104 and the sixth resistor R106 connected in series, for receiving a control signal (MOTOR-A). The collectors of the second transistor Q102 and the fourth transistor Q104 are connected to the first terminal of the tuning circuit 130. The base of the fourth transistor Q104 is connected to the common terminal through the eighth resistor R108. The emitter of the fourth transistor Q104 is connected to the common terminal; Among them, a fifth capacitor C105 is set at the collector and emitter of the fourth transistor Q104, which is used to filter out high-frequency noise in the power supply or signal.

[0023] In some implementations, to ensure the stability of the input voltage signal, a second capacitor C102 and a third capacitor C103 connected in parallel can be set in the circuit. These capacitors have a filtering function and are used to filter out high-frequency noise in the power supply or signal to stabilize the circuit operation. Specifically, one end of the second capacitor C102 and the third capacitor C103 are connected to the +5V power supply terminal. The other ends of the second capacitor C102 and the third capacitor C103 are connected to the common terminal.

[0024] Specifically, when one of the control signals (MOTOR-A) input to the main control module is high, the fourth transistor Q104 is turned on and the second transistor Q102 is turned off. When one of the control signals (MOTOR-A) input to the main control module is low, the second transistor Q102 is turned on and the fourth transistor Q104 is turned off. When the other control signal (MOTOR-B) input to the main control module is high, the third transistor Q103 is turned on and the first transistor Q101 is turned off. When the second transistor Q102 and the third transistor Q103 are turned on, and the fourth transistor Q104 and the first transistor Q101 are turned off, the +5V voltage / current signal is input from the emitter-collector of the second transistor Q102 to the first terminal (corresponding to M+) - the second terminal (corresponding to M-) of the motor M - the collector-emitter of the third transistor Q103 to the common terminal. The motor M is controlled to rotate forward or in reverse, and the resistance of the dual potentiometer VR1 is controlled to decrease or increase, so as to increase or decrease the volume of the left / right channel audio output. When the first transistor Q101 and the fourth transistor Q104 are turned on, and the third transistor Q103 and the second transistor Q102 are turned off, the +5V voltage / current signal is input from the emitter-collector of the first transistor Q101 to the second terminal (corresponding to M-) of the motor M, then to the collector-emitter of the fourth transistor Q104, and finally to the common terminal. The motor M is controlled to rotate in reverse or forward, and the resistance of the dual potentiometer VR1 is controlled to increase or decrease, thereby decreasing or increasing the volume of the left / right channel audio output.

[0025] Wherein, L-IN / R-IN are the left / right channel audio inputs; L-OUT / R-OUT are the left / right channel audio outputs adjusted by the dual potentiometer VR1.

[0026] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A motor-controlled volume adjustment circuit, characterized in that, have: The main control module is used to output at least one control signal; The first driving circuit has its signal input terminal coupled to a signal output terminal of the main control module, and is used to receive one of the control signals. The second driving circuit has its signal input terminal coupled to another signal output terminal of the main control module, and is used to receive another control signal. The tuning circuit has its first terminal connected to the output terminal of the first driving circuit. The second terminal of the tuning circuit is connected to the output terminal of the second driving circuit; When one of the control signals output by the main control module is low and the other control signal is high, or When one of the control signals output by the main control module is at a high level and the other control signal is at a low level... The tuning circuit is controlled to adjust the output audio volume.

2. The motor control volume adjustment circuit according to claim 1, characterized in that, The tuning circuit includes at least a motor and a dual potentiometer connected in parallel. The first end of the motor is connected to the output end of the second drive circuit. The second end of the motor is connected to the output end of the first drive circuit. When one of the control signals output by the main control module is at a low level and the other control signal is at a high level, the motor is controlled to rotate forward or in reverse, and the resistance of the dual potentiometer is controlled to decrease or increase, so as to increase or decrease the volume of the output audio. When one of the control signals output by the main control module is at a high level and the other control signal is at a low level, the motor is controlled to rotate in reverse or forward, and the resistance of the dual potentiometer is controlled to increase or decrease, so as to decrease or increase the volume of the output audio.

3. The motor control volume adjustment circuit according to claim 2, characterized in that, The tuning circuit also includes a first capacitor. One end of the first capacitor is connected to the first end of the motor. The other end of the first capacitor is connected to the second end of the motor.

4. The motor control volume adjustment circuit according to claim 1, characterized in that, The first driving circuit and the second driving circuit are connected in parallel.

5. The motor control volume adjustment circuit according to claim 4, characterized in that, The first driving circuit includes at least a first transistor and a third transistor connected in series. The base of the first transistor is connected to the +5V power supply terminal through the first resistor. The emitter of the first transistor is connected to the +5V power supply terminal. The bases of the first transistor and the third transistor are connected to another signal output terminal of the main control module via a third resistor and a fifth resistor connected in series, for receiving another control signal. The collectors of the first transistor and the third transistor are connected to the first terminal of the tuning circuit. The emitter of the third transistor is connected to the common terminal.

6. The motor control volume adjustment circuit according to claim 5, characterized in that, The first transistor is selected as a PNP type transistor. The third transistor is selected as an NPN transistor.

7. The motor control volume adjustment circuit according to claim 5, characterized in that, The second driving circuit includes at least a second transistor and a fourth transistor connected in series. The base of the second transistor is connected to the +5V power supply terminal through the second resistor. The emitter of the second transistor is connected to the +5V power supply terminal. The bases of the second and fourth transistors are connected to a signal output terminal of the main control module via a fourth and a sixth resistor connected in series, for receiving one of the control signals. The collectors of the second and fourth transistors are connected to the second terminal of the tuning circuit. The emitter of the fourth transistor is connected to the common terminal.

8. The motor control volume adjustment circuit according to claim 7, characterized in that, The second transistor is selected as a PNP type transistor. The fourth transistor is selected as an NPN transistor.

9. The motor control volume adjustment circuit according to claim 7, characterized in that, It also includes a second capacitor and a third capacitor connected in parallel. One end of the second capacitor and one end of the third capacitor are connected to the +5V power supply terminal. The other end of the second capacitor and the third capacitor are connected to a common terminal.

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