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.
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This machine is called the Super Square effect. This gripping power is no less than live stereo.
Circuit principle
The local circuit can be roughly divided into the following three parts:
1. A low frequency enhancement circuit consisting of a resistor and capacitor.
2. Using the feedback input of the power amplifier IC to form a stereo inverting synthesis circuit.
3. Using the power amplifier IC to form the driving circuit of 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.
Stereo inverting synthesis circuit IC 2 pin and 8 pin DC coupling capacitor, composed of 0.47UF and 50K potentiometer. 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 200UF/10V to about 1000UF, you can get better results.
element
There are nothing special about all components. The resistance is 1/8W. 0.1UF and 0.47UF capacitors use monolithic capacitors, others use electrolytic capacitors. In the potentiometer, 20K is a double potentiometer and 50K is equipped with a switch potentiometer. Stereo plug for plug.
Production
Production is extremely simple, even for beginners, one day is enough. Be careful of the polarity of the IC's foot and electrolytic capacitor.
The wiring of the potentiometer is messy, don't make a mistake. If there are no wiring errors and poor soldering, it will be a success.
Plug in a stereo headset or regular headset, insert the battery, and turn the switch on. If the two knobs work well together, listening to music can be extremely impressive. According to the appropriate adjustment of the music and sound source, this is the main point of use of this machine.
Needless to say, connecting with a small stereo, TV, CD will get better results.
Description: In the circuit schematic, W1 is a double potentiometer for bass boost and W2 for reverberation. In the printed circuit board diagram, A1 and A2 are left and right channel inputs. Potentiometers W1 and W2 are both fixed to the edge of the box, where W2 is a potentiometer with a switch.
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