Automatic speed-stabilizing circuit of player

Abstract

The invention discloses an automatic speed-stabilizing circuit of a player. The automatic speed-stabilizing circuit is composed of an optocoupler detecting circuit, a waveform shaping circuit, a control circuit and a driving circuit. The optocoupler detecting circuit connected to the waveform shaping circuit is used for sending a pulse signal to the waveform shaping circuit; the waveform shaping circuit connected to the control circuit is used for carrying out filtering and shaping on the pulse signal transmitted by the optocoupler detecting circuit and outputting the processed signal to the control circuit; the control circuit connected to the driving circuit is used for storing reference frequency information, carrying out analysis and comparison on the reference frequency information and the pulse signal outputted by the waveform shaping circuit to obtain a difference value, and sending out a control instruction to the driving circuit based on the difference value; and the driving circuit controls a player based on the instruction of the control circuit. The automatic speed-stabilizing circuit has the following beneficial effect: with the control circuit, the rotating speed changing phenomenon caused by aging of the rubber belt and the abrasion of the carbon brush can be corrected automatically.

Description

technical field [0001] The invention relates to a rotation speed circuit, in particular to an automatic speed stabilization circuit for a turntable player. Background technique [0002] At present, turntables require records to rotate at a uniform angular speed on the turntable. Speed ​​and wobble are important assessment indicators for turntables. If the rotation speed is unstable, it will directly affect the sound quality. Ordinary turntables are generally mainly composed of DC brushed motors, belts, turntables and pickup devices. During production, the factory needs to arrange multiple stations to monitor and adjust the speed, resulting in low production efficiency, high production cost and poor consistency. In addition, as time goes by, the rubber belt will also age, and the carbon brushes of the brushed DC motor will wear out, so the speed will change day by day, and the sound effect will also deteriorate. [0003] Moreover, the general turntable does not have a speed...

AI Technical Summary

Problems solved by technology

When the factory is producing, it is necessary to arrange multiple stations to monitor and adjust the speed, resulting in low production efficiency, high production costs, and poor consistency

In addition, as time goes by, the rubber belt will also age, and the carbon brushes of the brushed DC motor will wear out, so the speed will change day by day, and the sound effect will also deteriorate.

[0003] Moreover, the general turntable does not have a speed self-test circuit. In order to ensure the speed accuracy, the following factors need to be considered: multiple workers and multiple positions are required to manually monitor and adjust repeatedly, resulting in low production efficiency, high production costs and inaccurate speed; rubber belts are easy to age, The speed will also change due to the aging of the belt; ordinary turntables generally use brushed motors, and the carbon brushes will also wear out, causing speed changes

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