Category: Electronics Projects

Audio Mixer Circuit

Engineeering Projects
circuit diagram of audio mixture using lm349

An audio mixer circuit is used to combine output from several microphones/channels into one or more common outputs, usually for public address purposes or while recording. The function of the audio mixture circuit, as the name suggests is to ‘mix’ the different audio signals which are fed to the input for the mixer. In this article, we include various types of audio mixer circuits from the simplest possible transistor audio mixer circuit to the high-end audio mixer preamplifier using an operational amplifier. Description and Working of Audio Mixture Circuit The…

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Audio Filter Circuit

Engineeering Projects
circuit diagram of audio filter using lm741

An audio filter circuit is a broadband filter and is also called a wide bandpass filter because its bandwidth is restricted to the audio frequency. Audio filter circuit can be formed by simple cascading high pass filter circuit and low pass filter circuit and is generally the choice for simplicity of design and performance through such a circuit can be realized by a number of the possible circuits. The butter-worth filter is generally used in audio systems which are characterized by a maximally flat-flat filter. Circuit Description of Audio Filter…

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Power Protection Circuit

Engineeering Projects
circuit diagram of power protection unit

Being active users of electrical appliances, we can’t deny the fact that they have almost become our right hand to perform our day-to-day activities. Some of these appliances cost us a heavy amount and when these devices fail to operate or get damaged, we suffer heavy economical loss and in addition to that, we lose our helping hand. To avoid this type of issue faced by most people, we have prepared this low-cost circuit “power protection circuit” which saves our dear electrically operated appliances from situations like sudden tripping and…

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Electronic Game Circuit | Electronic Pendulum

Engineeering Projects
circuit diagram of electronic game

Every person gets a pleasant feeling staring at pendulum when it is oscillating. This pendulum trick can be used in different ways to create a shimmering atmosphere. Electronic technologies guide us through people’s soul and thus help us to win their heart eventually. Here we have presented similar type of game circuit which is used to produce attention-grabbing phenomenon like “dashing light” and pendulum. It sounds quite interesting, don’t you feel so? As everyone knows pendulum oscillates in to and fro motion about a vertical mean position. This process can…

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Transistor, TRIAC and SCR Tester Circuit

Engineeering Projects
circuit diagram of transistor triac and scr tester

In different types of electronic circuits, you might have seen multiple elements in common. Some of these commonly used semiconductor devices, without which electric circuits are almost incomplete are SCRs, transistors, and TRIACs. In broad electronics circuits when small elements fail to function, its consequence affects the performance of the whole circuit. So, before building the overall circuit, one must be wise enough to check the functioning of circuit elements to avoid future complications. The Transistor, TRIAC, and SCR Tester Circuit presented below assists us in a similar way to…

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Door Bell Circuit

Engineeering Projects
circuit diagram of door bell

This project describes the constructional and working details of a door bell circuit. The door bell circuit presented here is of 2-notes (modulated sound) type and delivers about 4-watt Musial power at 12 volt. While using it as a door bell circuit, 6V DC supply is enough, which can be derived either from dry battery cells or a battery eliminator. The door bell circuit is flexible enough to work off right from 6V to 18V supply, without change of any component in the circuitry. However, it is important to use…

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Temperature Deviation Indicator Using OP-AMP 741

Engineeering Projects
circuit diagram of temperature deviation indiator

For laboratory work, an accurate temperature deviation indicator is more effective than a sophisticated thermometer. The electronic device temperature deviation indicator using 741 can register a difference of 0.20C between the thermal sources and display it with the appropriate direction of variation. It can be used as a heater coil controller to maintain the equilibrium level. Circuit Description of Temperature Deviation Indicator using op-amp 741 The circuit of temperature deviation indicator using op-amp 741 is simple and self-explanatory. Two silicon diodes (D3 and D4) complete a bridge network and act…

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Low Pass Filter Circuit | Low Pass Filter Design

Engineeering Projects
circuit diagram of low pass filter using lm387

An electric filter or simply a filter is an electric network that passes or allows without loss, the transmission of electric signal within a certain frequency range but stops or disallows transmission of electric signal outside this frequency range. The low-pass filter circuit is also known as a scratch filter and is used to roll off excessive high-frequency noise from worn-out records and tapes. Or we can also define low pass filter as, it passes all frequencies up to a specified frequency, called the cutoff frequencies fc, and reject all…

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High Pass Filter Circuit | Rumble Filter

Engineeering Projects
circuit diagram of high pass filter using lm741

An electric filter or simply a filter is an electric network that passes or allows without loss, the transmission of electric signal within a certain frequency range but stops or disallows transmission of electric signal outside this frequency range. The three most-popular filters found in audio equipment are the High Pass Filter (rumble filter), Low pass filter (scratch filter), and speech filters. The rumble filter is a high-pass filter, used to suppress the low-frequency rumbling sound associated with old and worn-out turntable and tape deck mechanisms. Here we explain to…

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Bass Treble Circuit

Engineeering Projects
circuit diagram of bass treble unit

Among different types of amplifiers available in today’s technical world, sometimes we get stuck with the audio frequency amplifiers which provide flat frequency low-frequency notes should be amplified more than the high-frequency note stable). The provision of bass treble is accordingly made to gratify the users and to compensate for the effect of noise that comes along with the signal. The bass treble combination is given a single name; tone control. Circuit Description of Bass Treble Circuit Talking about the bass treble circuit, it is comparatively much simpler and gainful.…

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