2B-12 TUNE MUSICAL BELL [ENGLISH]
This project can be used on your door bell, intercom and as car reverse horn. This bell produces twelve English tunes and offers your guest a warm welcome.
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and tested O.K. in our TV Engineers Technical Lab. The components and PCB used in the projects published in our books are available for sale at resonable price.
In the present days of electronics, the conventional spring door bell are being replaced by electronic musical bells. The project described here produces 12 English tunes which are pleasant and heart touching. The working of the project depends on the ROM IC3482. The IC incorporates the Run of control, Oscillator, Modulator, Tone generator, Rhythm generator, Timber generator, Frequency divider and Pre- amplifier in its internal configuration. The 12 tune musical tone produced by the IC is amplified by the transistor BC187 and applied to the speaker to produce sound.
PRECAUTIONS WHILE ASSEMBLING THE PROJECT:-
*First of all check all the components as per circuit.
*Check polarity of diodes [anode and cathode]
*Clean PCB after SOLDERING, so that the component or print do not short.
*Please use resistance of the exact value as given in the circuit.
*Check polarity of electrolytic capacitor while mounting on PCB otherwise reverse connection may damage it.
IC UM3481 / 3482 = 1
BEL 187 = 1
DIODE IN4007 = 1
12K = 1
100K = 1
47 PF = 1
PUSH TO ON SWITCH = 1