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The car’s dedicated voice circuit LM-04YD has solidified four voices such as “reverse, please pay attention”, “turn left, please pay attention”, “turn right, please pay attention”, “brake, please pay attention”, which can be independently triggered to control 4 segments Voice output, while providing 4 output ports to control each LED flashing light. The picture shows the LM-04YD pin and its application circuit.

LM-04YD series car special voice circuit schematic diagram

LM-04YD series car special voice circuit schematic diagram




In the figure, the four trigger circuits are the same, all of which are composed of resistance-capacitance step-down, filtering, and diode voltage stabilizing circuits. R7 and C8 form the external resistance-capacitance component of IC1's internal oscillator. Proper adjustment of R7 can change the oscillation frequency to achieve the purpose of adjusting the speed of voice pronunciation. The 4 output ports VOD1, VOD2, VOD3, VOD4 are respectively connected with external transistors VT1, VT2, VT3, VT4, and directly drive the J1, J2, J3, J4 relays. The main contactor of the Jl-J4 relay is a normally open type, ZD1 is a reverse indicator, ZD2 is a left turn indicator, ZD3 is a right turn indicator, and ZD4 is a brake indicator. The audio signal is output from the VO terminal of IC1. Push the speaker after LM386 amplification. The voice output and the corresponding indicator light flash at the same time to strengthen the attention of pedestrians.

Automotive Cable

The automobile cable is a kind of connecting wire inside the automobile, which is mainly used for current transmission of batteries, instruments, lamps, etc. Due to the particularity of the automobile industry, the manufacturing process of automobile cables is also more special than other ordinary wires. In most cases, it is required that the car cable will be cold and high temperature resistant.


The selection principle of automobile wires is determined according to the insulation degree of wires, the current passing through and the required mechanical strength. For electrical equipment working for a long time, the conductor with 60% of the actual current carrying capacity can be selected; For electrical equipment that works for a short time, conductors with actual current carrying capacity between 60% and 100% can be selected. Automobile electric system belongs to low-voltage power supply, with large working current and voltage loss. Excessive voltage loss will affect the normal operation of electrical equipment. Therefore, when selecting the conductor section, it is necessary to ensure that the voltage loss does not exceed a certain value: 12V system is not more than 0.5V, 24V system is not more than 1.0V. The actual working current of the conductor shall not be greater than the allowable current carrying capacity of the conductor.

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