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Motorbikes are popular of transportation with high usage rates. Safeguarding motorbikes is a necessity for users to provide security. Researchers offer motorcycle safety using sound indicators. The working principle of motorcycle safety offered is after the main key or contact is on position and the Mic sound indicator is blown, amplifier circuit works to drive the relay driver that connects the CDI unit. Motorcycle safety circuit system will live and if there is no blow, motorcycle safety circuit will not function. Research on motorcycle safety circuit can be used with input indicator sound. Components needed include Mic condenser, driver relay circuit, power supply. Measurement of the relay driver circuit and condenser mic aims to find out which circuit can work as planned. The measurement results obtained testing the motorcycle safety circuit with the following explanation: When the sound indicator and driver get a touch simultaneously which gives a signal that the signal from the sound indicator is connected to the amplifier driver, so that the signal is detected, will provide input to the relay (on) and CDI unit when the motorcycle will work. With an indication the LED will turn on.