FM – IF System

Engineeering Projects
IC design FM-IF system

This IC includes a 3-stage FM-IF amplifier/limiter arrangement with level detectors for each stage and a balanced quadrature FM detector. As illustrated in Figure 1, the quadrature-tuned circuit requires two external coils, a capacitor and resistor and a single adjustment. Most ICs of this type also include an audio amplifier as well as a driving circuit for the tuning meter output, automatic frequency control (AFC) for the FM tuner, and AGC for the RF amplifier stage. The muting sensitivity control is optional and provides automatic muting (squelching), if desired. An…

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AM/FM RECEIVING SYSTEM

Engineeering Projects
ic design of am/fm radio system

The circuit designed hereby constitutes of the major portion of every AM/FM receiving system. It can be used to design a complete AM/FM receiving system. Addition of components like audio power amplifier, AM converter (mixer and local oscillator, AMIE detector, FM IF and FM detector) form the internal building block of entire receiving system. However, for the receiving system to function flawlessly, external components like capacitors, coils, and resistors need to be included in the circuit which is obvious necessity. The operating characteristics such as bandwidth and gain of the…

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RGB Colour Generator using Arduino

Engineeering Projects
arduino based RGB color generator

Basically, RGB represent three basic colour RED GREEN and BLUE which is used in our digital system for generation various other colour. The project ‘RGB Colour Generator using Arduino’ is basically a tutorial on how to generate colour code and hex code of that color. Circuit Description of RGB Colour Generator using Arduino The circuit of RGB colour generating using arduino is basically designed using a microcontroller unit (Arduino uno), a 16×2 alpha numeric LCD, a RGB LED and few resistor and variable resistor. The circuit diagram is shown in…

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Soil Moisture Meter using Arduino

Engineeering Projects
arduino based soil moisture meter

The project ‘Soil Moisture Meter using Arduino’ uses arduino board, a 16×2 LCD module and soil moisture sensor in order to display the humidity (moisture) of soil. This project is very useful for farmer, floriculture, researchers etc. in order to know the moisture of soil at different stage. The working principle and circuit description is very simple that anymore can understand who have little knowledge of arduino board. The project is basically an interfacing circuit between arduino board with LCD and sensor. Previously, we had posted Greenhouse Automation System for easy, cost effective,…

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Arduino VU Meter

Engineeering Projects
VU meter using arduino

The project ‘Arduino VU Meter’ uses 16×2 alphanumeric LCD to display signal level of audio. Basically, VU Meter is used to represent volume of audio equipment. Previously we had posted a project Sound VU Meter using Arduino which uses LEDs to represent the level of volume where audio is taken from microphone. Unlike sound VU meter using arduino the project Arduino VU meter take input audio from two different channels i.e. left channel and right channel. Circuit Description of Arduino VU Meter The circuit of Arduino VU Meter is shown…

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Temperature Controlled Fan using Arduino

Engineeering Projects
arduino based temperature controlled fan

The project ‘Temperature Controlled Fan using Arduino is simply fabricated around Arduino uno board and temperature sensor LM35. The projects are a good example of embedded systems designed using a closed-looped feedback control system. For proper user interface visual indication we had also used LCD which indicate the temperature as well as the speed of the fan. Circuit Description of Temperature Controlled Fan using Arduino The entire circuit of ‘Temperature Controlled Fan using Arduino’ utilizes very few components, an MCU (Arduino Uno), a temperature sensor (LM35), an LCD, a motor…

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Industrial Timer Circuit

Engineeering Projects
industrial timer transmitter circuit

Humans are born of habits, they want more and more comfort. To match their requirements, various types of automatic control systems have been developed. Now, again here we have come up with a very interesting project called “Industrial Timer Circuit” with facilities like automation and switching, providing delay and having a long-range of control (100 m). A simple timer circuit can be designed using 555 timer IC by configuring it into monostable mode. These types of circuits have various types of limitations like digital display, an indication of system failure, remote…

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Arduino FM Receiver Circuit using TEA5767

Engineeering Projects
author prototype of fm receiver using arduino

The circuit posted here is of Arduino FM Receiver using digital radio—receiver module TEA5657 by Philips. Additional components like audio power amplifier, Arduino uno board, and LCD module to display station number and frequency. However, for the receiving system to function flawlessly, external components like a capacitor, resistor, etc are included in the circuit, which is necessary. if you wish to make your FM transmitter circuit using Arduino please go through this link: Arduino FM Transmitter Description Arduino FM Receiver Circuit using TEA5767 The circuit of the project Arduino FM…

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Pachisi Circuit Game using 555 IC

Engineeering Projects
pachisi electronics game circuit

Pachisi game is a game similar to backgammon played mostly in Indian subcontinent, in which cones and cowries shells are used instead of counter and Dice. The game is played on a board between two persons, with the pieces moved in accordance with the throws of the cones or cowrie shells. This is an interesting game to test the ‘frustration quotient’ of the players. The rectangular board includes a number of red and green circles. Opponents start from the same square and move in opposite directions. The player who reaches…

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Auto Cut for Manual Stabilisers using 741 IC

Engineeering Projects
auto cut system for manual stabiiser

Many circuits have been published about the auto-cut arrangement in manual stabilisers. These circuits generally use transistors with zener diodes as the only sensing device. However, these circuits have two main drawbacks. Spurious triggering of the transistor Fluctuation in zener diode Circuit Description of Auto cut for manual Stabilisers The circuit of auto cut for manual stabilisers described here overcomes spurious triggering of transistor and fluctuation in zener diode drawbacks. It uses the most versatile op-amp IC741 a schmitt trigger. The reference voltage is given by a combination of 4.6V,…

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