This is the simplest ever musical calling bell that can be easily built. It uses the
musical 3 pin IC UM66 and a popularly known Transistor BC548b. The circuit
can be made even without soldering and the ideal for the first electronic project
for newbies. Here the musical IC UM66 generates the music when it receives
supply and drives a small speaker through a class c amplifier using silicon
transistor BC548b.
The UTC UM66TXXL series are CMOS LSI designed for using in door bell, telephone and toy application. It is an on-chip ROM programmed for musical performance. Produced by CMOS technology, the device results in very low power consumption. Since the UTC UM66TXXL series include oscillation circuits a compact melody module can be constructed with only a few additional components.
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Points of importance:
Never connect the IC in reverse supply connection.
The music depends on the part number of the IC .
The transistor are should be connected in proper pin configuration.
The recommended power supply is battery of 3 volt.
The speaker and resistance has no terminal polarity and connection points
can be interchanged.
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