Automotive dedicated voice circuit LM-04YD

The car-specific voice circuit LM-04YD solidifies four voice sentences: "Reverse, please pay attention", "Turn left, please pay attention", "Turn right, please pay attention", "Brake, please pay attention", and can independently trigger and control 4 segments. Voice output, while providing 4 output ports to control each LED flash. The picture shows the LM-04YD pins and its application circuit. In the figure, the four trigger circuits are the same and are composed of resistor-capacitor voltage reduction, filtering, and diode voltage stabilizing circuits. R7 and C8 form the external resistor-capacitor components of IC1's internal oscillator. Appropriate adjustment of R7 can change the oscillation frequency to achieve the purpose of adjusting the speech pronunciation speed. The four output ports VOD1, VOD2, VOD3, and VOD4 are connected to external transistors VT1, VT2, VT3, and VT4 respectively, and directly drive J1, J2, J3, and J4 relays. The main contact of the Jl-J4 relay is a normally open type, ZD1 is the reversing indicator light, ZD2 is the left turn indicator light, ZD3 is the right turn indicator light, and ZD4 is the brake indicator light. The audio signal is output from the VO terminal of IC1. After being amplified by LM386, the speaker is pushed. The voice output and the corresponding indicator light flash at the same time to remind pedestrians to pay attention.