05-09-2016, 05:33 PM
25 tune musical door bell doorbell.docx (Size: 176.05 KB / Downloads: 4)
-: INDEX :-
TYPES PAGE NO.
1. INTRODUCTION 5
2. CIRCUIT DIAGRAM 6
3. COMPONENT LIST 7
4. WORKING 8-9
5. ADVANTAGES AND APPLICATIONS 10
6. RESULTS 11
7. BIBILOGRAPHY 12
-: INTRODUCTION :-
The RTS 993 is a CMOS LSI designed for use in toys, doorbell, music boxed, melody clock / timers and telephones. It is designed to play the melody according to previously programmed information and is capable of greeting songs with piano effect . By pushing the sequence trigger key, all songs can be sequenctially selected and played with auto-stop function.
-: CIRCUIT DIAGRAM :-
-: COMPONENT LIST :-
RESESTORS :
R1 : 390K
R2 : 120K
CAPACITORS :
C1,2,3 : 100KPF
C4,5 : 2.2UF / 63V
C5 : 10UF / 25V
SEMICONDUCTORS :
D1 : IN 4007
D2 : IN 4148
T1 : BEL 187
IC : 1 RTS 993-9A
• 16 PIN BASE
• 2 CELL BATTERY HOLDER
• 2 ½ SPEKER
-: WORKING :-
Oscitlator Circuit :
The oscillator frequency is used as a time
base for which tone and tempo generators,
the accuracy of which aflects the quality of
the melody generator.
Tempo Generators :
There are 14 tempos available in this
embodiment 82,88,95,103,112,123,137,154,
176,205,246,308,410,and615 notes per min’s
Tone generator :
The Tone generator is a programmed divider.
The tone frequencies are created by
dividing the oscillator frequancies with M,
where M is an integer from 32 to 127 .There
are 27 tones selectable in this embodiment,
Including end code.
Rhythm Generator :
The rhythm generator is also a programmed
divider and is used to generate the beat for
each for each tone. In this embodiment, 15
beats are available as follows: ¼ , 1/2, ¾, 1,
5/4,3/2,7/4, 2,9/4, 5/2, 11/4, 3, 13/4,7/2,
and 15/4.
ROM :
The mask ROM stores the tempo, tone and
rhytm Data. The ROM send sthese data to
respective generatores so as to control the
tempo of each song,the tone codes and the
rhythm codes.
RTS :
1. Home sweet home
2. Waltzing tell overture
3. William tell overture
4. Long long ago
5. America patrol
6. Amazing Grace
7. Battle ifymn of the Republic
8. Old folks at home
9. Toredors song
10. Oh, Susanna
11. Are you going run all night
12. Are you sleeping
13. O, sole Mio
14. Did you ever see a lassie
15. Oh ,my darling
16. I wish I was in Dixie
17. Santa lusia
18. Home on the range
19. America the Beautiful
20. The yellow roses of Taxes
21. Three blind mice
22. Love me thunder
23. Silver threads among the gold
24. My wild irish rose
25. she’ll be coming round the Mountain.
-: ADVANTAGES AND APPLICATION :-
1. 1024 Note ROM memory
2. 2.5v to 5v Power Supply
3. Low power consumption
4. 14 tempos available through mask setting
5. 15 beats available
6. 27 notes ( including rest) available
7. 1 sequance trigger key
8. Natural sound effect two individual external envelope
circuits.
9. Dynamic speaker can be driven with an external NPN
transistor.
10. Power on reset, melody begins from the first note.
11. Typical oscillator frequency 130KHz.