I need to design a sounder cct. that changes the pitch of the tone over an inpu range of 0-5v. At present I am using a 555 timer and controlling the frequency of output by applying the a controlling voltage to pin 5. However this does not produce a wide enough range of output frequencies for the application it is required for. Any ideas on how I could increase the range of frequencies available? Processing using a PIC16f877 is an option.
The cct. is for use within an altimeter project and the tone is needed to give an indication of whether the user is rising or falling. It needs to audibly vary over a range of 300ft.
The cct. is for use within an altimeter project and the tone is needed to give an indication of whether the user is rising or falling. It needs to audibly vary over a range of 300ft.