The car’s dedicated voice circuit LM-04YD has solidified four voices such as “reverse, please pay attentionâ€, “turn left, please pay attentionâ€, “turn right, please pay attentionâ€, “brake, please pay attentionâ€, 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.
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.
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