Listening to music with headphones, especially small headphones, always feels that the music is not enough, and the effect in the low frequency band is even worse. Therefore, the local camera is used to enhance the low-frequency characteristics of the earphone, and the stereo inversion synthesis method, together with the built-in simple matrix surround sound circuit, can obtain a strong bass and widen the sound range in a wider range. This machine is called the Super Square effect. This gripping power is no less than live stereo.
Circuit working principle: Low-frequency enhancement circuit composed of resistors and capacitors. A stereo inverting synthesizing circuit is constructed by using the feedback input of the power amplifier IC. A power amplifier IC is used to form a driving circuit for the headphones. From the resistance capacitance between the input ICs to enhance the low frequency characteristics, because of the potentiometer, the enhancement of the low frequency part can be continuously adjusted between 0 and 10 times. The stereo inverting synthesis circuit IC2 pin and 8-pin DC coupling capacitor are composed of 0.47μF and 50K potentiometers. In this circuit, the high-pitched parts of the stereo square effect component are respectively inverted and combined to enhance the effect. Push the headset with the Toshiba TA7376P. This IC contains two channels with few external components and can operate at low voltage. When the load impedance is low, the low-frequency sound of the moving effect can be reproduced. If the power supply is switched to a 5# battery, four series are connected in series and the voltage is 6V, which can directly drive the high output speaker. If you increase the capacitance of three 200μF/10V to about 1000μF, you can get better results. Selection of components All components are nothing special. 0.1μF and 0.47μF capacitors use monolithic capacitors, others use electrolytic capacitors. In the potentiometer, 20K is a double potentiometer and 50K is equipped with a switch potentiometer. There is no special requirement for the resistor. Ordinary 1/8 or 1/4W metal film resistors are used. Stereo plug for plug. 
AC (Alternating Current) Power cord is to transmit high voltage. It is used to drive machinery or home appliances. Since AC Power Cord is output of high voltage electric power, there is a risk of electric shock injury, therefore, All the AC power cord must comply with safety standard to produce. DC (direct Current) power cord is used to the applicance with lower voltage mostly, so safety requirement is less stringent.
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