Positive and negative dual power inputs use LM317 and LM337 linear voltage regulator chips to stabilize the voltage. The voltage is adjustable. TVS protection devices and power supply slow start are added to the power supply part. The headphone amplifier uses a 3.5mm headphone jack input and a 6.35mm headphone jack output, two levels. Magnification, NE5532 magnifies 2 times, TPA6120 magnifies 1 times. The actual capacitor can be selected according to the situation, the test function is available, and the effect is very good when using low-sensitivity headphones.
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