Natural Sound Effect Melody Generator

Natural Sound Effect Melody Generator

Here I have built a simple Melody generator using Realtek's 15 beats Melody chip RTS993. The circuit is simple and works first shot. No need for a PCB, although I have built one. You can comfortably built one on a vero board and use it in doorbells, Melody Clock/timer etc. Tones generated are impressive and the project is, real Value for Money. There is no other information to give, except that the operating voltage is 3V DC and pressing SW (Switch) sequentially plays the tunes. Resistor , R1, between pins 4 and 5 of the IC changes the oscillation frequency which in turn controls the time base for the tone and tempo generators. D1 is a LED indication of melody being played. I used a BC107 for T1, but any other NPN transitor would do. Other variation of the circuit as mentioned in the application notes are available with me on request (6 pages).

RTS993.gif (3078 bytes)

Figure 1

Parts List

D1 - LED , C1-22uF , C2-10uF, R1-390K, C3-22uF, C4 - 0.1uF, T1 - NPN