The goal of this device was to create a doorbell that would allow the home user to change the sound of the doorbell from a simple chime to any other noise of their choosing. The device had to be easy to use, inexpensive, and easy to install. Several different ideas were considered ranging from using a digital recording chip to including a CD-player to play pre-recorded CD’s. Of all of these ideas, the digital recording chip stood out as the easiest to use, cheapest, and easiest to construct. The digital recording chip design consisted of a few different components soldered together on an etched circuitboard. With this design, major modifications could be made to the overall layout of the design that could not be made with a pre-existing sound circuit (like ones that can be purchased at Radio Shack). The main components of the circuit were the actual sound recording chip and the audio amplifier. For these two parts, the ISD 1400 series was used for the recording chip, and the LM386 was used for the audio amplifier. The etched circuit board and components were to be placed in a wooden housing. This housing was basically an 8 by 5 by 2.5 in box. The box had a hole in the front for a speaker and two in the sides for the microphone and the record button. There was a hole in the back that allowed for the doorbell button to be connected. When the device was in its circuit prototype stage (on protoboard) it seemed that there would be a major problem with noise in the signal. After careful reading it was discovered that the inherent resistance in the protoboard itself was creating the bulk of the noise. When the circuit board was etched and all of the debugging was complete, it was confirmed that the final product had much less noise than it did when it was on protoboard. The final product allowed for a 20 second recording. It could be easily recorded using the button on the side and the mounted microphone. The device had telephone quality sound playback a recording. It was powered by of 4 AAA batteries. It seemed to work well with most houses with some minor adjustments to the home doorbell circuitry.