Category: alarm / sound generator

Mains Trigger Musical Door Bell Circuit

Engineeering Projects
circuit diagram of mains trigger door bell

Door bell system is probably one of the earliest electronics project. Large number of projects has followed the series, each with different components and different sound effects. The projects published till now were either completely battery operated or were mains based. On doing so, the project consumed more power form a single source and sometimes didn’t even operate for desired limit of time. Here we have tried to reduce the problem to some extent by publishing the project “Mains Trigger Musical Door Bell Circuit”. This unique Mains Trigger Musical Door…

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Machine Sound Generator Using 555 Timer IC

Engineeering Projects
machine sound generator circuit

Countless projects have been developed with a variety of alarming effects. We prefer different sound effects in different places. For instance, in security-based projects sharp and alarming sound is considered the best option, whereas, in the doorbell, the soft sound is found pleasant to the ears. Thus, it is more appropriate to have related sound effects for particular areas. The project “Machine Sound Generator Using 555 Timer IC” is a similar project aiming to generate machine sound solely for industrial applications. However, the circuit Machine Sound Generator Using 555 Timer…

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Grasshopper Sound Generator Circuit using 555 Timer IC

Engineeering Projects
circuit diagram of grasshopper sound generator

Electronics projects just because of the name must not, always be complicated and advance level projects. Small projects play a vital role in the field of electronics. Here is a similar basic project which is named, ‘Grasshopper Sound Generator Circuit Using 555’. The project will surely entertain children and for electronics beginners, this project is the best option to start with. Especially at night times, we do often hear the shrill sound of grasshopper or cockroach. This project also produces a similar sound (PI-PI sound like grasshopper) and for this…

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Car Reverse Horn Circuit

Engineeering Projects
circuit diagram of car reverse horn

Unexpected incidents occur in the road when the driver is unaware about certain activities that may lead to accidents in the vicinity. For instance, suppose you are on a trip with your family and driving along the narrow road, while you were in the middle of conversation, you notice car right at the front is driving backwards towards your car and in seconds is going to hit you. It may be too late before you realize the situation. Maybe if you had known earlier, you could save yourself and your…

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Multi Sound Generator Circuit

Engineeering Projects
circuit diagram of multi sound generator

Sound generating circuits fascinates everyone. Dedicated circuits are available in the market to provide a single type of sound or technically it can be said as ‘circuits with one level of intensity of sound’. In contrast to those circuits, here we present you a multi-sound generator circuit which offers a wide range of sound intensities as directed by the name of project itself. The multi sound generator circuit is designed such that it produces a total of eight different levels/types of sound from the single circuit. This is what makes…

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Electronic Siren Circuit

Engineeering Projects
circuit diagram of electronic siren

Multiple alarm circuits are developed and are distributed in the market so as to serve the needs and demands of client. Though the design parameter may vary, but all circuits are based on the same principle to provide security services under probable conditions. Designing these circuits becomes entertaining with different sound effects we can use during the designing phase.   A similar electronic siren circuit is depicted in the figure below. The electronic siren circuit is different from other siren circuits from a fact that it uses a dual-amp MC1458,…

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Tune Player Using Arduino

Engineeering Projects
circuit diagram of tune player using arduino

Arduino board is designed for working with digital signal or square wave signal. If we want to generate sine wave, we have to do little effort, because analog output from arduino is not true analog but a PWM output which turn board on and off very frequently. Here we use digital to analog converter to generate fine analog output. A digital to analog converter has a single output having number of digital input. PARTS LIST OF YUNE LAYER USING ARDUINO Resistor (all ¼-watt, ± 5% Carbon) R1 – R4, R8…

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Aural Metronome Circuit

Engineeering Projects
aural metronome circuit diagram

A metronome is a device which produces regular beats and is measured in beats per minute. Here is project called aural metronome circuit which produce fixed sound (Tick – Tick) like quartz watch. The stability of pulse can be adjusted from 40 to 400 ticks per minutes using preset VR1. Circuit Diagram of Aural Metronome Circuit The circuit of aural metronome is designed using a CMOS quad NAND gate IC (CD4011), out of which we uses two NAND gates only. Variable resistor VR1 is used to control the rate of…

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Door Ajar Alarm Circuit

Engineeering Projects
circuit diagram of door ajar alarm circuit

Here is an another alarm circuit in the section of sound generator, the project posted here is of door ajar alarm circuit which alerts in every ten seconds that your door is open. Circuit Description of Door Ajar Alarm Circuit The heart of the circuit is 14-stage ripple carry binary counter IC CD4060. The working principle of the circuit is very simple, when high input at reset pin (pin 12) is given all the output becomes low and vice-versa.  Switch SW1 is used as door open/close sensor, when the door…

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Simple Siren Circuit using CD7400

Engineeering Projects
circuit diagram of electronic siren

Various types of siren circuit like electronic siren, toy siren, warning siren etc. are already posted in bestengineeringrpojects.com . Now here in one another simple siren circuit using popular and low-cost NAND gate IC (CD4700), which gives hour of entertainment and also can be used in toy. Description of Simple Siren Circuit using CD7400 Siren circuit is build around NAND gate IC (CD7400), a PNP transistor (SK100B) and few passive components. In this circuit we use only half part of IC1. NAND gates N1 and N2 are wired as low…

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