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Sound Effects Kits
Offering quality product range as :
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 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.
Refer PDF for more information:
Tune Selective Musical Bell
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.
Raised And Furrow Seed Cum Fertilizer Meters
We offer Raised And Furrow Seed Cum Fertilizer Drill & Planter. It is suitable for planting maize and garlic on ridges. The machine consists of 5 to 9 bottom ridger a hopper with 5 units of inclined plate metering mechanism, driving wheel and furrow openers. The furrow openers with the help of lever are moved horizontally by a tractor operator at the end of each turn so as to place furrow openers on a southern side of east west ridge. Which is the requirement for planting of winter maize.
Simple circuit generates 15 different notes
Three Tune Musical Bell
Simple low cost melody project
Multi Tone Siren
Select Police, Ambulance, Fire & Staccato siren with 8W amp. O/P
Smoke Detector Alarm
Many industries have to suffer lot from smoke problems. But this unit provides a great relief to this problem.The sensor assembly consists of white LED D1 and Photodiode D2, which are mounted face to face in an enclosure such that when smoke passes through this enclosure, a noticeable alarm is raised.
About the Circuit:
The circuit is designed around IC1, which is wired in monostable mode. Photodiode D2 is connected in reverse bias mode. In presence of light it has very low resistance. But when light falling on it gets interrupted, its resistance increases to a very large value. This feature is used to trigger IC1.Diode D1 is used to fall light on D2. The intensity of light is controlled using preset P1. In absence of smoke, transistor T1 does not conduct and reset pin 4 of IC1 remains high. Output of IC1 at pin3 is low and transistor T2 remains in cut-off state and alarm is not raised.
As soon as the smoke passes through the enclosure, light falling on D2 gets interrupted, transistor T1 conducts and reset pin4 goes low. As a result IC1 gets triggered and pin3 goes high. Transistor T2 conducts and buzzer raises the alarm. At the same time LED D3 lights, which gives visual indication.Diodes D4, D5 are used to rectify the 12V AC signal and capacitor C3 is used as a filter capacitor.
Rain alarm circuit alerts the people when it begins to rain. The circuit is build around monostable multivibrator IC1. The sensor connected to trigger pin2 of IC1 is made from resistor leads or small metal foil pieces. When sensor detects rain, IC1 gets triggered and raises the alarm. Also when the rain stops, the circuit switches off autometically.
About the Circuit:
The circuit is based on the operation of IC1. It is used in the monostable mode i.e. it gets triggered when the voltage at pin2 is below 1/3Vcc.
When rain falls on the sensor, the voltage at pin2 goes below 1/3Vcc. Hence IC1 generates high output pulse at pin3. As a result transistor T1 connected to pin3 conducts and piezobuzzer connected to it sounds an alarm. LED D1 gives the visual indication that the rain falls.
Note on SENSOR:
One can make a suitable sensor according to one’s choice. A model of the sensor is shown in figure. The distance between the rails is made as small as possible so as to have a more compact and reliable sensor.
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