Modified the MP3 player in the car audio system, the effect is good, the circuit is shown in the figure. After the MP3 audio signal is taken out from the headphone cable, and then attenuated by the resistance voltage divider, it is sent to the switch for different signal conversion selection (MP3 signal / Magnetic tape, radio signal), and finally the selected signal is sent to the car's power amplifier circuit for amplification.
Modification method: first remove the tape playback part of the car, find the pre-amplified output end and the input end of the power amplifier (these 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 input end is touched with metal objects such as tweezers, the corresponding speaker should emit a strong "click" sound, and the original preamplified output and power amplifier are disconnected Connect the input of the input circuit according to Figure 1. The switch can be a double-pole double-throw toggle switch or a button switch, and is fixed in a proper position in the machine room with small screws. It is best to use a four-core shielded wire for the connection. The headphone cable for picking up MP3 audio signals can be obtained from used headphones.
Test machine: Only when the wiring is correct, can the test machine be powered on. Turn the newly installed switch to the tape / receiver position, and the tape playback and radio should be normal.
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