In this article we will learn how to build a simple 3 watt amplifier circuit which can be powered directly from a computer 5V USB port for driving an 8 ohm 3 watt speaker. You can build a couple of such circuits and use them for creating a stereo output into a pair of 8 […]
Audio Projects
120 Watt Amplifier Circuit using TDA 2030 IC
An impressive 120 watt amplifier circuit can be built by cascading a couple of TDA 2030 IC in a bridged tied load (BTL) configuration and through a few current boosting transistors. Advantage of a BTL Amplifier Topology The main objective of a BTL configuration is to enable a two way operation of the load which […]
Simple 150 Watt Amplifier using Transistors
In this post we learn how to make a simple 150 watt power amplifier circuit using a typical OCL design which ensures cheap layout and use of minimum components, with high reliability. Introduction Referring to the figure a perfectly symmetrical OCL based amplifier can be seen , using discrete components suitable for all electronic enthusiasts […]
Audio Record/Playback using IC ISD1820
The post explains the functioning of the IC ISD1820 which is a single chip audio message record/playback chip featuring a 20 second audio recording and storing facility in its internal memory and playing it back through a small 8 ohm speaker whenever required. Introduction The IC ISD1820 is a device which features a single chip […]
OCL Amplifier Explained
In the field of audio amplifiers OCL stands for Output Capacitor-Less Amplifier design. How it Works In this OCL type of amplifier topology or configuration, the power output stage is directly coupled to its preceding driver stage without coupling capacitors. The following figure shows a typical OCL amplifier output stage, as can be seen, the […]
Mp3 Player Using DFPlayer – Full Design Details
In this post we are going to construct an Mp3 player using arduino and DFPlayer. The proposed article has two Mp3 player designs, one with push button control and another one with IR remote control. We will also take a look at DFPlayer (Mp3 player module) and its specifications. By Girish Radhakrishnan We all love […]
4 Channel DJ Audio Mixer for Discotheques Applications
This is a universal 4 channel DJ audio mixer project that may be customized and upgraded to 5 channel or even 10 channel level as desired by the user. 5 Stage DJ Mixer Five stages are employed within the layout; DJ mixer stage; Mono headphone amplifier stage; Balanced-microphone preamplifier stage; Stereo VU circuit stage, and […]
Build this Balanced Microphone Preamplifier
In this post we learn about a simple Hi-Fi balanced microphone preamplifier circuit and also evaluate the calculations, specifications of the design through formulas. What is a Balanced Preamplifier A “balanced” amplifier or differential amplifier possesses not one but two distinct inputs and only the difference amongst these inputs is actually amplified. To elucidate just […]
60 Watt Stereo Amplifier using Gainclone Concept
The explained gainclone 60 watt stereo amplifier circuit is capable of producing an excellent sound quality, using a single IC LM3875. The IC is manufactured by Texas Instruments and can be expected to produce a good 60 watts of power output on a 8 Ohm speaker. General Features of the LM3875 The general features of […]
10 Stage Sequential Latch Switch
In this post we learn how to make a 10 step sequentially switching latch circuit which is used for switching ON 10 high power amplifiers sequentially. The idea was requested by Mr. Jerry B. Williams Circuit to Switch ON Power Amplifiers in Sequence My circuit question will be more detailed than you really care to […]
Buzzer with Incrementing Beep Rate
The post discusses a buzzer circuit with an incrementing beeping rate, which can be used in critical warning signalling applications. The idea was requested by Mr. Lee. Buzzer with Progressive Beep Rate Could you help me with a circuit. I’ve been trying to find but so far had no luck! I need a pulsing piezo […]
Simple Surround Sound Decoder
This article is written with an intent to explain in detail behind the making of a simple surround-sound decoder circuit. By: Dhrubajyoti Biswas Overview The concept of the decoder was first introduced by David Hafler in the 70s. His research illustrates the way to use two speakers as rear speakers on a surround system. The […]
Simple 50 Watt Power Amplifier
A simple 50 watt amplifier circuit is explained below, let’s learn how to build it at home using this versatile single amplifier chip LM3876T By: Dhrubajyoti Biswas Analyzing the Circuit A good power amplifier is a necessity, especially when it comes to listening music. An amplifier added to a sound system will definitely enrich the […]