The MP3 player is modified in the car audio system, the effect is good, the circuit is shown in the figure. After the MP3 audio signal is taken out by the headphone cable, the resistor is divided and attenuated, and the switch is sent to perform different signal conversion selection (MP3 signal / The tape, the radio signal, and finally the selected signal is sent to the car's power amplifier circuit for amplification. This article refers to the address: http:// Modification method: first remove the tape playback part of the car, find the output of the preamplifier and the input of the amplifier (the two ends are connected, as long as one end is found, the other end is known. They are generally composed of one The two-core shielded wire is connected to the connector. When the power is turned on and the metal object such as tweezers touches the input end, the corresponding speaker should emit a strong "snake" sound, and the original preamplified output and the power amplifier are disconnected. The input is connected according to the circuit of Figure 1. The switch can be equipped with a double-pole double-throw type toggle switch or push button switch, and is fixed with screws to the appropriate position in the machine compartment. It is best to use a four-core shielded cable for the connection. A headphone cord that picks up MP3 audio signals can be taken from used headphones. Test machine: If the wiring is correct, the test machine can be powered on. Turn the newly installed switch to the tape/receiver position, and the tape playback and radio should work properly.
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