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Mini-box 2W Amplifier

Mini-box 2W Amplifier Designed for self-powered 8, 4 & 2 Ohm loudspeakers. Contains Bass-boost switch.... [read]

2N3055 Power Amplifier 60W

2N3055 Power Audio Amplifier circuit diagram... [read]

22 Watt Audio Amplifier

22 Watt Audio Amplifier with only one chip TDA1554 ... [read]

15 Watt Amplifier

A 15 watt amplifier made using discrete components. Interesting and not so difficult do build.... [read]

ECM Mic Preamplifier

A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components... [read]

Headphone Amplifier

An amplifier to drive low to medium impedance headphones built using discrete components... [read]

Class-A-AB Amplifier 100w

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker... [read]

UHF Preamplifier

This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals.... [read]

Bench Amplifier

This circuit is basically an audio amplifier, but it is placed in this category because it may be used as signal tracer. It is built around simple National... [read]

Quadraphonic Amplifier

This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels... [read]

25W Mosfet audio amplifier

High Quality simple unit. No need for a preamplifier.... [read]

50 Watt Amplifier

This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device.... [read]

Low impedance microphone amplifier

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. ... [read]

18W Audio Amplifier

18W Audio Amplifier made of transistors.... [read]

10W Mini Audio Amplifier

10W Mini Audio Amplifier with very small count of electronic components based around TDA2003 circuit. You can use this powerful amplifier in any small audio... [read]

Portable Headphone Amplifier

Can be directly connected to CD players, tuners and tape recorders.... [read]

Phono Preamplifier

In recent years, following CD's introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old... [read]

Portable Microphone Preamplifier

This circuit is mainly intended to provide common home stereo amplifiers with a microphone input.... [read]

Stereo Preamplifier with Bass-boost

This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers.... [read]

10W Audio Amplifier with Bass-boost

Audio amplifier that boosts bass tones.... [read]

Guitar Amplifier

The aim of this design is to reproduce a Combo amplifier of the type very common in the sixties and the seventies of the past century.... [read]

60W Guitar Amplifier

Bass, Treble, Harmonic modifier and Brightness controls. Output power: 40W on 8 Ohm and 60W on 4 Ohm loads... [read]

Stereo Tube Amplifier

The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer.... [read]

Amplifier of acoustic frequencies and preamplifier

Tendency of catering: 15V Force of expense: 4,2Wrms in the 4W Minimal signal of entry: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier.... [read]

Motorola Hi-Fi power amplifier

This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it is shown in the table (from 20 W to 80 W RMS)... [read]

Tiny audio amplifier using LM386

Small audio amplifier for weak signals. Simple to build.... [read]

Stereo tape head preamplifier using LA3161

Stereo tape head preamplifier using LA3161 circuit diagram... [read]

20W Bridge Audio Amplifier

20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc.... [read]

20W Audio Amplifier using LM1875

20W Audio Amplifier kit is based on LM1875 IC.... [read]

Infrared cordless Headphone Amplifier

Infrared cordless Headphone Amplifier circuit diagram.... [read]

Portable Audio Amplifiers

It is designed for portable cassette players and radios. You can also use it as your PC Audio Amplifier. A few external components required to build this circuit.... [read]

Universal Preamplifier

Useful for amplifying weak signals before amplifier.... [read]

60W Linear amplifier

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.... [read]

Telephone amplifier

While talking to a distant subscriber on telephone, quite often we feel frustrated when the voice of the distant subscriber is so faint that it is barely intelligible.... [read]

Amplifier Timer

This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least.... [read]

Low cost intercom using transistors

The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and... [read]

Infrared Head Phones

Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place... [read]

Fire Alarm

This circuit warns the user against fire accidents. It relies on the smoke that is produced in the event of a fire. When this smoke passes between a bulb and... [read]

Linear FM 50Watt with BLY90

A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured... [read]

8 Watt Audio Amp

Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.... [read]

Three-Level Audio Power Indicator

This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set... [read]

Audio Light Modulator

Audio light modulations add to the enjoyment of music during functions organised at home or outdoors.... [read]

Stepper motor controller

This project allows you to control the speed, direc-tion, and step size of a unipolar four-phase step-per motor. The controller is capable of handling motor... [read]

6 x 6 Loop Antenna

It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz... [read]

Telephone Audio Interface

Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed... [read]

AM Transmitter

The circuit is in two halfs, an audio amplifier and an RF oscillator.... [read]

Sound Controlled Filp Flop

Described here is a very inexpensive solution to many phono-controlled applications like remote switching on, for instance, or activating a camera, tape recorder,... [read]

Dynamic Microphone Preamp

A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance... [read]

ZN414 Portable Receiver

An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. ... [read]

Keys Finder

Imagine that is morning , you barely anticipate the bus for work and you can't find your keys. If you suffer from this situation frequently, this circuit is... [read]

The ATL-3 Loop Antenna

The ATL-3 Loop Antenna. The Medium Wave Circle can be found on [read]

Portable Mixer

The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance.... [read]

Audio Line Driver

This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive... [read]

Audio Notch Meter

The controls may also be adjusted for use as a band stop (notch) filter or band pass filter.... [read]

Sine Wave Generator

This oscillator produces sinusoidal wave. It's made around LF351 or TL071CN or TL081CN. A classic Wien Bridge oscillator... [read]

A bipolar regenerative receiver

Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently... [read]

A small FM transmitter

This SMD FM transmitter has an operating frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance... [read]

Ultra low drop linear voltage regulator

The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere. Drop of a fewer millivolts is possible with better... [read]

6 Input Mixer

A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts. The mic inputs are amplified about 100 times or by 40dB, the total gain... [read]

Computer Microphone

This circuit is adapter for PC which enables you to use electret microphones. It's an audio amplifier made of two BC547C.... [read]

Ultrasonic Switch

Circuit of a new type of remote control switch is described here. This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz... [read]

Audio Perimeter Monitor

Used to detect sound in some area. This circuit has only two transistors and several passive components... [read]

Electromagnetic field detector

This lovely circuit is a real gem! Easy to assemble and more sensitive than many commercial devices available.... [read]

High Quality Intercom

A very high quality intercom, which may also be used for room monitoring... [read]

Use the CD-ROM drive as a audio CD player

Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect it to an amplifier.... [read]

Peak Reading Audio Level Meter

This circuit has minimal number of components and it's easy to build. It measures peak level of a sound signal. It uses ... [read]

3 Transistor Audio Amp

Here is a little audio amplifier similar to what you might find in a small transistor radio. The input stage is biased so that the supply voltage is divided... [read]

Digital Volume Control

This circuit could be used for replacing your manual volume control in a stereo amplifier.... [read]

5-Band Graphic Equalizer

This complete high quality, low noise 5-BAND GRAPHIC EQUALIZER circuit is based around Monolithic Linear integrated circuit LA3600 manufactured by SANYO. This... [read]

4 Transistor Transmitter

This circuit provides an FM modulated signal with an output power of around 500mW... [read]

Transistor Tester

This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter... [read]

Pulse-Generator and Signal-Tracer

This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio... [read]

Field-strength meter

This is a very straightforward circuit. The first stage acts as a crystal receiver.... [read]

Transmitter FM 45W with valve

Force of expense: max 45W... [read]

Op-Amp Microphone Preamp

Audio preamplifier designed for dynamic or electret microphones. Uses several components which are easy to find. It has a 23.5k ohm input impedance. It can... [read]

Medium Wave Active Antenna

This circuit is designed to amplify the input from a telescopic whip antenna... [read]

IR Remote Control Modulation Detector

A circuit to extract and measure the modulated carrier of an Infra Red remote control... [read]

Ultrasonic pest repellent

It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can�t hear these high-frequency... [read]

Phone Broadcaster

Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier.... [read]

Clap Activated Remote

An infra-red or wireless remote control has the disadvantage that the small, handy, remote transmitter is often misplaced. The sound operated switch has the... [read]

Telephone Headgear

Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic components.... [read]

3W FM Transmitter

This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL... [read]

High Voltage Low Current Supply

high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors... [read]

CB receiver

CB receiver... [read]

AM Receiver

This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the... [read]

Amplified Ear

This circuit, connected with 32 Ohms impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will... [read]

Automatic Loudness Control

In order to obtain a good audio reproduction at different listening levels, a different tone-controls setting should be necessary to suit the well known behaviour... [read]

Lightning Detector

Here is a VLF receiver tuned to 300 kHz designed to detect the crackle of approaching lightning. A bright lamp flashes in sychrony with the lightning bolts... [read]

Salt Taster

This circuit was designed to detect the approximate percentage of salt contained in a liquid. After careful setting it can be useful to persons needing a quick,... [read]

Off line Telephone tester

H ere is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. The circuit is so simple that... [read]

AC Current Monitor

This circuit was designed on request, to remotely monitor when a couple of electric heaters have been left on.... [read]

Speed-limit Alert

This circuit has been designed to alert the vehicle driver that he has reached the maximum fixed speed limit (i.e. in a motorway). It eliminates the necessity... [read]

Speaker Box Audio Amp

Amplifier for your computer. Very serious electronic project.... [read]

High And Low Voltage Cut Off With Time Delay

The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances... [read]