Search Results for: audio amplifier

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…

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…

Listening Bug Circuit using op-amp LM386

Engineeering Projects
listening bug circuit using opamp LM386

Listening bug? What is that? Is it what strikes your head, the first time you see this title? Well, allow us to clear your confusion. Listening bug is a resemblance to that concept improves the quality of sound we hear. Input sound collected by the condenser microphone with high-sensitivity is supplied to the Listening Bug Circuit and adjustable sound gain is obtained at its output which improves the quality of sound for obvious reasons. Now, people can hear everything smoothly without risk of interruption and no talks will be missed.…

Electric guitar preamp circuit

Engineeering Projects
author prototype of guitar pre-amplifier box

The entire circuit of the ‘Electric guitar preamp circuit’ is divided into small sections to ensure simplicity and easy understanding of the project. The first section comprises a single transistor that serves as a common-emitter amplifier. Be it in melodious songs or in rock songs, the guitar is an inseparable part of music in today’s world. To extend the level of sound such that it can be heard by every individual in a mass, amplifier circuits are extensively incorporated into the music system. And this circuit represents a similar concept.…

Speech Communication using Laser

Engineeering Projects
speech communication using laser receiver circuit

Light offers the fastest path for transmission of signals in comparison to any other medium. The circuit “Speech Communication using Laser” makes use of this aspect, it is a one or two-way optical communications system using a short-wavelength visible laser diode (say, RLT6505 or the laser module of a laser pointer) as the light-emitting element, free space as the transmission media and a light-dependent resistor as the light-receiving element. This system is a perfect medium for speech communication between two adjacent offices or between homes on the opposite sides of…

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,…

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…

Laser Voice Transmitter Circuit

Engineeering Projects
author prototype of transmitter unit

The engineer like to communicate with their mates but radio wave is too easy to intercept using light with morse code is tricky. Here Laser Voice Transmitter Circuit uses a laser beam to transmit the voice. Circuit Description of Laser Voice Transmitter Circuit:- Most all communication systems comprised of two parts, the project laser voice transmitter also comprised of two parts i.e. the transmitter circuit and the receiver circuit. The transmitter circuit:- The transmitter circuit is built using a microphone, audio amplifier, laser diode, and a few passive components. A…

Clap Switch Cum Touch Switch

Engineeering Projects
circuit diagram of clap switch cum touch operated switch

Various Switching circuits including clap switch, touch witch heat switch is already posted. Now, here is two in one switching circuit i.e. clap switch cum touch switch with a facility of timer. Circuit Description Clap Switch Cum Touch Switch This circuit uses a timer IC NE555 (IC2) and audio amplifier IC TBA810 (IC1). TBA810 is a 7-watt audio amplifier IC which is used to amplify the audio signal coupled from audio transformer X1. Here we used a loudspeaker as a sound sensor. The audio transformer of 3 volts is connected…

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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