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16 Tune Musical Door-Bell
Gives 16 different tunes by pressing switch sixteen times
This simple circuit finds application as a doorbell as well as telephone intruder music player, toy or attention call bell.
The heart of the circuit is an IC4822 named as IC1. IC4822 is a programmed ROM, which generates 16 musical tunes when it gets triggered. The main feature of this IC is that it has inbuilt tone generator, rhythm generator, modulator, oscillator, frequency divider and preamplifier. So a very few number of components have to be connected externally to set up timing and to build an external AF amplifier/driver circuit.
About the circuit:
When switch S1 is pushed on, voltage at pin 4 triggers IC4822. After triggering, IC plays a musical tone.16 musical tones can be heard simultaneously on pressing S1 sixteen times.
Transistor T1 is used as an amplifier connected to chip preamplifier output at pin 11 to drive 8W loudspeaker.
Resistor R1 controls the tempo i.e. the speed at which tune is played. Tempo can be varied as per choice by changing the value of R1.
This musical bell generates 16 musical tones by pressing switch sixteen times. It can be used as a door-bell, telephone intruder alarm or attention call bell.
16 Tune Selective Musical Bell
Play a selected tune from 16 tunes generated by the circuit
This musical bell provides a facility to select any of the 16 tones generated by IC 4822 (IC1). IC1 is a programmed ROM, popularly known as musical doorbell IC. This IC has an on-chip oscillator and preamplifier circuit. So a very few number of components have to be connected externally to set up the timing and to build up an external AF amplifier/driver circuit.
About the Circuit:
When switch S2 is closed and S1 is in up position, IC1 gets triggered due to the triggering voltage at pin4. IC1 plays a musical tone.16 musical tones can be heard simultaneously by pressing S2 sixteen times.
To play a selected tune, selector switch S1 is pushed down. First tune is selected. Other tunes can be selected by pressing S1 again. The selected tune can be played any number of times by pressing S2.
Capacitors C1 and C2 are used to avoid 50Hz interference from mains. Resistor R2 is used for frequency control at which the tune is played. Transistor T1 is used as a driver transistor connected to pin11 which drives the 8W loudspeaker.
Touch Sensitive Musical Bell
This musical bell generates different musical tones every time the plate is touched. If the plate is touched for more than two seconds, it gives a sound (beep-beep) different from the musical tone. Musical tune is produced after removal of the hand touching the plate. Only a few additional components are required to achieve excellent results.About the Circuit:
The heart of the circuit is a musical tone generator IC4822 (IC1). This is a programmed ROM IC, which has inbuilt oscillator and tone generator.
Touch plate is connected to base of transistor T1. When the plate is touched, T1 conducts and IC1gets triggered. Hence it generates a musical tone. The output at pin 11 of IC is driven by transistors T2 and T3 and in turn drives 8W Loudspeaker.
Care should be taken that battery supply should not be greater than 3V.
This musical bell generates different musical tones every time the plate is touched. Musical tune is generated after removal hand from the touching plate.
When the metal plate is touched, IC gets triggered and generates melodious tone. On next touch, next tone is generated. Thus 16 tones can be heard simultaneously by touching plate 16 times. The speed at which the tune is played can be set with the help of preset.
Simple circuit generates 15 different notes
The modern electronics presents this Electronic Harmonium as a hobby kit or people who are interested to have hands on experience in this field.
IC1 as shown in the circuit diagram is wired as an astable multivibrator. When the voltage at trigger input pin2 of IC1 is below 1/3Vcc, output at pin3 changes its state from low to high. This is achieved by putting the probe on strip, which changes the voltage level of pin2 below 1/3Vcc and IC gets triggered.
Three Tune Musical Bell
Simple low cost melody project
The UM 66T series are CMOS IC is designed for use in doorbell, telephone and toy applications. They are on chip ROM programmed for musical performance produced by CMOS technology, these devices result in very low power consumption, since the UM 66T series include oscillating and mode selection circuit, a compact melody module can be constructed with only a few additional components.About the circuit:
The circuit uses UM 66T having 64 note ROM memory. Which is capable to store three different tunes.
There are different types of siren tones used for different purposes like ambulance, police fire etc. The siren kits available in the market generate normally a single tone. With multitone siren kit, we can generate different types of siren tones for different purposes. This unique feature of the circuit makes it versatile and useful in wide range of applications like burglar system, lift door open alarm, smoke detector and any other alerting application.About the circuit:
Versatile UM 3561, 8 pin IC is used here to generate four different audible ones. Basically IC has built in oscillator, control circuit, address counter, ROM and Tone generator etc .The predefined programs generate different tones only with few external components. The IC operates at low voltage of 3 volts upwards. Its quiescent current is as low as 150 micro amperes.
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