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16 TUNE MUSICAL DOOR-BELL
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 APM993D named as IC1. IC APM993D is a programmed 1024 note ROM memory, 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.
AUTO ON/OFF TIMER
Widely used to switch ON/OFF devices with settable timing from 3 to 30min
This is a simple and inexpensive timer, widely used to switch on/off devices. It has a settable timing between 3min to 30min. The circuit is build around counter IC4060 (IC1) and inverter IC4049 (IC2).
The circuit switches on autometically when power is on, and it switches off when the settable time is over.
ELECTRONIC KITS
POLICE / AMBULANCE SIREN
Introduction:
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 burgler system, lift door open alarm, smoke detector and any other alerting application.
THREE TUNE MUSICAL BELL
The UM 66T series are CMOS LS 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.
ELECTRONIC HARMONIUM
The modern electronics presents this Electronic Harmonium as a hobby kit or people who are interested to have hands on experience in this field.
This harmonium can generate 15 different notes of music (one at a time). It has a PCB with 15 parallel copper strips. Each strip corresponds to one note. So as you put the probe on a strip, the instrument plays a corresponding note.
The circuit is build around IC1, which is used as a astable multivibrator. The frequency produced depend on the note selected by the probe. When we put the probe on different strips, we are effectively changing the frequency by changing the resistance between pin7 and pin2 of IC1.
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LISTENING BUG
Used to listening voice the people sitting in the nearby room.
How great, if you are able to listen the people sitting in the adjoining room. This project provides an effective way to this imagination.
This is a very simple and inexpensive circuit uses an operational amplifier IC 741 (IC1) and push-pull amplifier using transistors for amplification of a signal.
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NOVEL LIGHT EFFECT
A bunch of LEDs flashes, which gives novel light effect.
This simple, low cost novel light effect circuit can be used for many purposes like decoration, display board etc. It uses total 88 LEDs and a bunch of 11 LEDs will glow at a time. After a few seconds another bunch glows and the cycle repeats.
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AUTO ON/OFF TIMER
Widely used to switch ON/OFF devices with settable timing from 3 to 30min
This is a simple and inexpensive timer, widely used to switch on/off devices. It has a settable timing between 3min to 30min. The circuit is build around counter IC4060 (IC1) and inverter IC4049 (IC2).
The circuit switches on autometically when power is on, and it switches off when the settable time is over.
TIMER WITH BUZZER INDICATOR
ON/OFF Timer with audible warning from 1 to 100 min delay
This circuit is used as portable parking meter timer and egg timer. The 14 stage binary ripple counter type IC 4060 has an onchip oscillator capable of stable operation over a relatively wide frequency is determined by an external RC network connected to pins 9,10 and11.
COOLER TIMER
Timer with ON time and OFF time setting for cooler/pump.
During summer seasons, we all us knows the need of coolers. If cooler is on for long time, then the requirement of water is also very large. To minimize this problem to a large extent cooler timer is designed. This circuit control the on and off time of cooler water pump according to the user requirement. The minimum and maximum time setting are fraction of second and one-and-a-half minute respectively.
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