Audio Circuits

555 Organ Circuit

Here is a schematic of a simple 555 organ circuit.The circuit is consist of two parts first 555 circuit of organ and second lm386 amplifier for driving 8 ohms speaker....

Bell Circuit

This is a project of a ding dong door bell circuit using 555 IC. The frequency of sound can be controlled with 5.6k and 10k resistors. The transistor 9013 is used....

Buzzer Circuit

This is a project of a 555 buzzer circuit. The circuit mentioned below will produce a buzzer sound when 9 volt power will be applied....

Four Siren Sound Generator Using UM3561

The circuit we are going to discuss here is a four siren sound generator using UM3561 IC which is a  low power CMOS IC. The four different sounds can be...

15x2 Watt Audio Amplifier Using TDA4935

Circuit of a 15x2 watt audio amplifier using TDA4935 IC. TDA 4935 is a stereo audio amplifer IC which supports two speakers output (15 watt each) and requires...

Intercom Circuit Using LM386 IC

The circuit mentioned here is a small easy to build Intercom circuit using one LM386 IC one 2N3904 transistor and few other components. LM386 is...

20W Audio Amplifier Using LM1875 IC

Here is the circuit of 20W audio amplifier using LM1875 IC. LM1875 is a very high quality low distortion 20 Watt audio amplifer IC available...

TDA2822 Amplifier

TDA2822 is a audio amplifier IC available in 16 pin power DIP package. The operating voltage of the IC is from 3V to 15V DC. The IC can be operated in both...

22 Watt Stereo Amplifier Using TDA1554Q

Here is a good quality mini 2 x 22 watt stereo amplifier using TDA1554Q IC. TDA1554Q can be also used as 4 x 11 watt amplifier...

UM66 Melody With TDA2822M Amplifier

Here is the circuit of an UM66 melody with TDA2822M amplifier. UM66 is a very famous CMOS melody IC available in TO-92 transistor package...

1W Mini Stereo Amplifier Using TDA2822M

Here is the circuit of a 1W mini stereo amplifier using TDA2822M IC. We often feel the requirements of headphone amplifier circuit for amplifying our small audio devices...

LM380 2 Watt Audio Amplifier

The LM380 2 watt audio amplifier circuit shown here is an easy to build circuit using only few external parts and able deliver 2W to 2.5 Watt output only on 10V DC...

Voice Amplifier Circuit

Here is schematic of a quality voice amplifier circuit. The maximum output of the circuit is 10 watt and the minimum and maximum operating voltage is...

LM380N-8 Audio Amplifier Circuit

LM380N-8 audio amplifier circuit IC is an another 8 pin dip version of LM380N audio amplifier IC which is available in 14 pin dip package...

Beeper Circuit

Here is a schematic of a beeper circuit. The circuit will generate a continuous beep-beep sound signal with flashing an LED...

Sensitive Microphone Circuit

The figure below shows a schematic of a very interesting sensitive mic circuit which will boost faint sounds from distance. The circuit is quite sensitive and provides good gain to weak audio signals...

Touch Alarm Circuit

Here is a very interesting project / schematic of a touch alarm circuit. The circuit is quite sensitive and it will activate a buzzer and an LED for a set time period when any one touches the metal plate...

Touch Alarm With UM66 IC

Here is a project of a 555 touch alarm circuit with UM66 melody IC. The circuit will produce a melodious alarm sound for a set time period when someone touches the...

Metronome Circuit

is a project of a 555 touch alarm circuit with UM66 melody IC. The circuit will produce a melodious alarm sound for a set time period when someone touches the...

TDA2822M BTL Mode Amplifier

Here is a project of TDA2822M BTL mode amplifier circuit. TDA2822M is a small audio amplifier IC available in 8 pin dip package. When building small battery operated...

Hearing Aid

The figure shows a very simple and easy to build hearing aid circuit using a TDA2822M audio amplifier IC and 2N4401 transistor...

Low Voltage 3W Audio Amplifier With TDA7056A

The figure below shows a very useful project of a low Voltage 3W audio amplifier circuit using TDA7056A. The heart of the circuit is a TDA7056A BTL mono amplifier IC...

Audio Activated Relay Switch

This audio activated relay switch circuit can be used for variety of audio related tasks. For example it can be used to start a recorder only when an audio signal is received...

Sound / Audio Level LED Meter

Here is a project of a sound / audio level LED meter circuit. It can be used as noise meter, loudness meter, sound pressure or VU level meter and also for variety of...

Sensitive Sound Activated Switch

This is a very sensitive sound switch circuit. It can detect sounds from many meters away and activate the relay switch and LED...

High Quality Buzzer / Beeper

The figure below shows a very high quality buzzer / beeper circuit using 555 ICs. The circuit can provide variety of beeping sounds and also blink an LED...

Mains Operated Doorbell

The schematic below shows a very simple and good quality project of mains operated doorbell or door chime circuit. The circuit is using a UM66...

555 Loud Horn

Here is a good quality and low cost project of a very loud 555 horn circuit. The circuit can be used as horn for bikes and other vehicles...

Automatic ON-OFF Buzzer Using 555

This is a circuit of an automatic ON OFF buzzer using 555 ICs. The circuit will produce a continuous beep beep sound through an 8 ohms speaker...

Sound Controlled Toggle Switch

The figure below shows a very useful and interesting project of sound controlled toggle switch circuit. The circuit is quite sensitive and can detect low sound signals easily...

Audio Controlled LEDs

If you require a simple circuit for audio driven or reactive LEDs then this simple audio controlled LED circuit can do the job very efficiently and you can make...

UM3561 Loud Siren

This is a project of simple UM3561 loud siren sound circuit. This simple siren circuit can produce a quite loud sound in an 8 ohms speaker...

Audio Activated Delay Switch

Here is a very useful project of an audio activated delay switch. The circuit can activate a relay switch for a preset time period...

LED Audio VU Level Meter Using Transistors

By using some transistors and few discrete components a very effective LED audio VU level meter can be made. VU is stand for Volume Unit, volume unit meters are...

Toy Ambulance Siren Using 555 IC

Here is a good designed diagram of a toy ambulance siren circuit using 555 ICs. The circuit is quite loud and can be operated with 6 to 12V DC...

Telephone Ringtone Generator Using 555 ICs

The figure below shows a very useful project of a telephone ring tone generator circuit. The circuit can be used for many purposes like intercom bell, calling bell etc...

Sensitive Clap Switch

This is a project of a sensitive clap switch circuit. A clap switch circuit is always come in the category of very interesting electronic circuits, it is also a good learning...

Sound Activated LEDs Using CA3140 IC

The figure below shows a project of sound activated LEDs using CA3140 IC. The circuit will blink or flashes three LEDs according to the sound received by the electret mic...

555 Ultrasonic Sound Generator

The figure below shows a project of a 555 ultrasonic sound generator circuit. This circuit is very simple to build and using only few discrete components with the IC...

Sound Direction Finder

Here is a project of a sound direction finder circuit, we can also say it sound source detector or sensor. The circuit is very sensitive and able to detect the origin of...

Electronic Metronome Using Transistors

This is a project of an electronic metronome using transistors. An electronic metronome is a device that is used by musicians. It produces a regular toc-toc beats...

Multi Melody Generator Using UM3481

Here is a very interesting project of a multi melody generator circuit using UM3481 IC. UM3481 is a mask-ROM-programmed multi melody generator...

High Quality Low Noise Mic Preamp Using TL071

Here is a circuit of a very good quality low noise mic amplifier circuit using TL071 IC. TL071 is a low cost high performance operational amplifier IC with...

Low Noise Mic Preamp Using NE5534 IC

This is a project of a low noise mic preamp with NE5534 IC. NE5534 is a low noise opamp IC manufactured in 8 pin dip package and designed to use in audio...

Simple 24W 12V Audio Amplifier Using TDA1516BQ

Here is a very interesting circuit of a 24W audio amplifier using a TDA1516BQ IC. TDA1516BQ is a class B audio amplifier IC available in 13 lead...

Multi Tone Generator

The figure below shows a project of a multi tone generator circuit. The circuit can produce different tones and can be used with any project where a tone...

Simple 2 x 40 Watt Amplifier Using TDA8560Q

This is a circuit of a very simple 2 x 40 Watt audio amplifier using TDA8560q IC. TDA8560q is a 13 lead SIL package IC...

Multiple Sound Effects Generator

Here is an interesting project of a multiple sound effect generator circuit. The circuit is using two ICs, which are MM5837 as IC1 and TDA2822M as IC2...

Mosquito Repellent Using Two Transistors

The figure below shows a simple mosquito repellent circuit. There are several techniques to get rid of mosquitoes. An electronic mosquito repellent...

Simple Siren Enhancer 10Watt

This simple 10 watt siren enhancer circuit can amplify the output of any simple or small output siren to 10 watt. It can be used with many melody and siren generators...

Alarm Generator Using CD4046 IC

Here is the project of a alarm circuit using CD4046 IC. CD4046 is a CMOS IC available in 16 lead packages. The IC can be used for many purposes for example tone...

Morse Code Practice Oscillator Using 555

The figure below shows a very useful project of a morse code practice oscillator circuit using a 555 IC...

Electronic Organ Using Transistors

This is a very interesting project of a simple electronic organ using transistors. The circuit can generate seven different tones and work like an electronic piano...

Piezo Buzzer Circuit

This article describes a project of simple piezo buzzer circuit using a piezo ceramic buzzer and few discrete components; the circuit will produce a loud tone...

Sound Controlled DC Motor

This is a project of a sound controlled motor using an opamp and few other components. The circuit will activate a DC motor when the microphone used...

Adjustable Buzzer Using 556 IC

Here is a project of a adjustable buzzer using 556 IC. The circuit provides beep beep sound which can be adjusted with the two variable resistors used...

Computer Audio Amplifier With Preamplifier

The figure shows a computer / PC audio amplifier circuit with preamplifier included. The circuit has some different features as compare to the normal computer speaker...

Sound Activated Alarm Using LM386 Audio Amplifier IC

The circuit will activate a buzzer for few seconds when the microphone receives a sound. The sensitivity of the circuit is good and it can detect sounds of whistle, clap...

Sound Activated Switch Using LM386

This is a project of a sound activated switch using LM386 IC. The circuit can activate a relay switch for few minutes when microphone receives any sound...

Bird Sound Generator Using 555 ICs

The figure below shows a very interesting project of a bird sound generator circuit using 555 timer ICs. An electronic bird chirping sound always get our attention in bells,...

Real Bird Sound Generator Using 555 ICs

This real bird sound generator circuit is built around three 555 timer ICs. The circuit will produce the real sound effects of a bird chirping...

Sequential Sound Activated Switches

Here is a very useful project of sequential sound activated switches. The circuit will activate four relay switches one by one when the microphone receive sounds...

Easy 220V Doorbell Using UM66 IC

Here is an easy to build 220V AC doorbell using a UM66 melody IC. The circuit is quite simple and low cost one but provides very good results. The circuit can also...

LM3914 VU Meter

Here is a project of a VU meter using LM3914 IC. The circuit will display signal level of any audio equipment. For example it will display the audio level of your...

Sound Sensor Switch Using LM393N IC

This article describes a project of a simple sound sensor switch circuit using a LM393N IC. LM393N is dual voltage comparator IC contains two...

Sound Sensor Switch Using LM358N

This is a project of a sound sensor switch using lm358N IC. LM358N is a dual high gain opamp IC, contains two independent opamp in one package...

VU Meter Using LM358 ICs

This is a project of a VU meter using LM358 ICs. The circuit is using four low cost LM358 operational amplifiers ICs and few other discrete components...

Voice Activated Loud Hailer

The figure below shows a project of a voice activated loud hailer circuit. The circuit can be used to amplify speeches. The circuit is a battery saver and can...

220V Doorbell With Mains Absence Backup

Here is a project of a 220V doorbell with mains absence backup. This doorbell will also run when the mains power is not present...

Door Knock Sensing Doorbell

This door knock sensing doorbell will become activated when some one knock on your door. The circuit is simple and sensitive and can detect even a small knock...

Beeper Using CD4011 IC

This door knock sensing doorbell will become activated when some one knock on your door. The circuit is simple and sensitive and can detect even a small knock...

Door Knock Activated Bird Bell

This door knock activated bird bell circuit can be used as a door bell to let you know if there is any visitor at your door...

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