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hi i am doing a project on a multipurpose siren system and i need to find an Ic that can be used in place of the UM3561 ic ie equivalent or a circuit that does this ie produces ambulance, fire brigade and police siren sounds bcos i cannot get this ic for now.
hello evryone,i'm having trouble identifying the pins of an ultrasonic transducer pair that i bought from a local store here in my country...i dont have a data sheet and i havent any experience dealing with such device.please help me..thank you so much...the pairs are MA40LIR and MA40LIS