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THE SECRET OF BELL
Abstract
This scheme helps identify identify members of your family. Basically it is less a musical Bell to switch activates a tightening of breathing.
The concept of
circuit description
The front end of the chain is a condenser microphone amplifier with fixed sensitivity of transistor T1 amplifies the signal received from the condenser microphone-through capacitor C1.
Zener diode supports power to IC2 at a safe level 3 volts.
circuit components
TRANSFORMER
DIODE
CAPACITOR
RESISTOR
549 BC TRANSISTOR BC 548 &
BATTERY
REGULATOR IC-7809
REGULATOR IC 7805
toggle switch
Condenser microphones?
Condenser The condenser, electronic component, which stores energy in the form of electrostatic field of the condenser is an obsolete term, but whose is stuck as the name of the microphone type ESTA, which use a capacitor to convert acoustic energy to electrical energy.
Also Capacitors tend to be more sensitive and responsive than the speakers, which makes them well suited to capture the subtle nuances in sound. They are ideal for large volumes of work, because of their sensitivity makes them prone to distortion.
As condenser microphones work?
You have two capacitor plates with a voltage between them. In the condenser microphone, one of these plates made of very lightweight materials and acts as a diaphragm the diaphragm vibrates. impact sound waves by changing the distance between the two plates and, consequently, the capacity. In particular, when the plates closer together, Increasing capacity and charging current occurs. When the plates apart and in addition, the capacity is reduced and the current level is.
UM66 UTC
Series UM66TXXL CMOS LSI that UTC is designed for
use the doorbell, a phone and a toy application.
This is the ROM chip is programmed to music
performance.
Is manufactured using CMOS technology, results in very
Low power consumption.
FEATURES:
64-Note memory Rom
1.5 ~ 4.5 in nutrition and low power consumption
Dynamic loudspeaker can be controlled by an external NPN transistor
Hold the OSC resistor
Power-on reset: Melody starts with the first sheet music
Built on hold level

Reference: http://studentbank.in/report-secret-bell...z3Jz1WtCwf