Audio Amplifier Circuit

Mini Stereo Audio Amplifier using IC TEA2025

This is a very simple schematic diagram of mini stereo audio amplifier build based the main power IC of TEA2025. This IC support both single audio channel and stereo audia channel. There will be 2x2.5W for stereo channel and 5W for mono channel with bridge mode. TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package. It is designed for portable cassette players and radios, featured with Working Voltage down to 3V, Few External components, High Channel isolation, Voltage gain up to 45dB(Adjustable with external resistor), Soft clipping and Internal Thermal protection.

100W Amplifier with Transistor 2N3055 and MJ2955

schematic diagram 7:15 AM No comments:

This is the circuit diagram of 100W amplifier with paired transistor 2N3055 and MJ2955. 2N3055 and MJ2955 is a silicon power transistor used mostly in amplifier and power supply circuitsbut it is designed for general–purpose switching and amplifier applications. 2N3055 transistor is packed in a TO-3 can, the maximum power rating is 115W, voltage 60V and 15 amperes maximum with a beta gain of 20 to 70 at a collector current of 4A.

2 x 15W Stereo Audio Amplifier with TDA4935

schematic diagram 11:51 PM No comments:

This is the scheme diagram of 2 x 15W stereo audio amplifier using single power IC TDA4935. The amplifier is a Class B stereo and is designed with the TDA4935 from Siemens, which delivers 15 watts each channel. It can also be configured in BTL or bridge, thus delivering 30 watts in mono channel configuration.

80W Power Amplifier based Single Power IC LM12 / LM12CL

schematic diagram 9:13 PM No comments:

80W Power Audio Amplifier with LM12 circuit

This is the schematic diagram of power audio amplifier using single power IC LM12 / LM12CL. The design is very simple. This power amplifier needs power supply with dual polarity output ( +, gnd, - ), don't exceed than 60V : (+30V) ; ground ; (-30V).

5W Audio Amplifier based LA4460

schematic diagram 8:47 PM No comments:

This is the scheme diagram of 5W audio power amplifier which can be built for general purpose and can drive speakers approximately 8 to 12 inches. This 5W audio amplifier circuit is based on the Sanyo LA4460 IC. Based on the IC datasheet, the LA4460 has capability to drive up to 12W power output, of course you will need more power in your power supply.

Notebook / Netbook Audio Amplifier

schematic diagram 12:57 AM No comments:

The audio output from a standart notebook or netbook with built-in speakers is low and the quality is also low. Alternatively, you can use a earphones to make good quality audio output, but for some people, earphones is unconfortable for them.

A power amplifier is needed to achieve a high volume. The following diagram is a simple circuit to amplify the notebook’s audio output.

The circuit is very simple and inexpensive, it use power amplifier IC LA4440 (IC1) and a few other components. LA4440 is a dual channel audio power amplifier, so you just need an IC for stereo application. It has low distortion over a wide range of low to high frequencies with good channel separation. Inbuilt dual channels enable it for stereo and bridge amplifier applications.

50W Amplifier Kit Project based TDA1514A

schematic diagram 7:19 PM No comments:

Here the very simple but powerful amplifier kit which built based on TDA1514A amplifier chip. The circuit is for single channel only, you should build two similar circuit for stereo application. A heatsink is a must to be attached on the IC TDA1514A. This circuit can be used as well as stereo amplifiers Bass in a 5.1 system.

2x2W Stereo Audio Amplifier based LM1877

schematic diagram 7:38 PM No comments:

Here the 2x2 stereo audio amplifier based on single chip LM1877. LM1877 is an amplifier chip designed to deliver 2W/channel continuous into 8Ω loads. This is a very simple and easy build low power audio amplifier with a low number of external components, and still provide flexibility for use in stereo phonographs, tape recorders and AM-FM stereo receivers, etc.

LM380 Audio Amplifier Circuits

schematic diagram 1:53 AM No comments:

This is an easy made, really simple and low cost mini audio amplifier based on integrated circuit LM380. Of course the main part of this amplifier is LM380 itself. This LM380 audio amplifier is simple and easy to built because of the simple circuit design which use minimal external components.

The the above amplifier circuit shows the LM380 in non-inverting mode, with the inverting input left open (the inverting input may also be tied to ground, either directly or through a resistor or capacitor). C2 is used to decouple Vcc from ground. The optional RC circuit at the output (pin 8) is used for added stability, for example, to remove/reduce oscillations in an RF-sensitive application.

150W Car Amplifier based LA47536

schematic diagram 1:56 AM 1 comment:

Here the 150W car amplifier circuit, build based LA47536 power IC. The LF353 which is manufactured by National Semiconductor, will split audio signal into three bands. While, the power IC LA47536 of SANYO will boost these signals. In stereo mode, we shall have the action of eight high speakers who are going to create a very important sound pressure.

32W HiFi Audio Amplifier Circuit based TDA2050

schematic diagram 3:24 PM No comments:

This is the very simple and easy build schematic diagram of 32W HiFi audio amplifier circuit based single power chip TDA2050. The TDA2050 can be work with single power supply or split power supply, but on the above circuit design, it use split power supply to work. A TDA2050 must be mounted on the heatsink to prevent overheat and keep good performance.

4W Audio Amplifier based TDA1013B

schematic diagram 4:09 AM No comments:

This is the scheme diagram of 4W audio amplifier built based single power chip TDA1013B. This is a mono amplifier circuit, so you need to build two similar circuit to make it stereo. 18V DC power supply with at least 0.5A current is recommended for this circuit.

Mini Audio Amplifier with Transistors

schematic diagram 8:29 PM No comments:

This is the mini audio amplifier which built using inexpensive transistors. The circuit is quite simple, low-cost and it consumes very low energy to work. It will work with 3V battery / power supply circuit

How the Circuit Operates:

The output is push-pull and needs lower than 3mA (without any signal) but drives the earpiece to a very loud level when audio is detected. The entire circuit is DC coupled and this makes it really challenging to set up.

12W MOSFET Audio Amplifier 2SK135 / 2SJ50

schematic diagram 10:32 PM No comments:

Here the 12W MOSFET audio amplifier circuit build based FET component of 2SK135 / 2SJ50. This is a small power amplifier, but capable on delivering very good sound quality. It combines an high quality op-amp IC (NE5534), which has the ability to drive low loads, high speed, low distortion transistor technology with two V-MOSFET in the output.

2x11W Stereo Audio Amplifier with LM4755

schematic diagram 1:28 AM No comments:

Here the circuit diagram of 2x11W stereo audio amplifier build based on single power chip LM4755 manufactured by National Semiconductor.

The LM4755 is a stereo audio amplifier able to deliver 11W per channel of constant typical output power to a 4Ω load or 7W per channel into 8Ω applying a single 24V supply at 10% THD+N. The internal mute circuit and pre-set gain resistors present for a very economical design solution.

2x30W Stereo Audio Amplifier based STK465

schematic diagram 7:35 PM No comments:

This is the stereo audio amplifier circuit build based on well-known power chip of STK465. The STK465 has two power amplifier module, so, with single chip of STK465 you can build a stereo amplifier with two input channels and two output channels. This circuit is require split power supply, recommended supply : +/- 28V / 2A. The STK465 should be mounted on proper heatsink.

Schematic diagram:

2x30W Stereo Audio Amplifier based STK465 circuit

Component Part list:

R1 = 1K
C1 = 1uF/35V
R2 = 3,3K
C2 = 470pF
R3 = 100
C3 = 100uF/60V
R4 = 330
C4 = 100uF/60V
R5 = 3,3K
C5 = 10uF/60V
R6 = 1K
C6 = 47uF/60V

R7 = 0,33
C7 = 8,2pF
R8 = 33k
C8 = 0,1uF
R9 = 4,7
C9 = 1uF/35V
R10 = 1k
C10 = 470pF
R11 = 3,3k
C11 = 100uF/60V
R12 = 100
C12 = 100uF/60V

R13 = 330
C13 = 10uF/60V
R14 = 3,3k
C14 = 47uF/60V
R15 = 1k
C15 = 8,2pF
R16 = 0,33
C16 = 0,1uF
R17 = 33k
R18 = 4,7
IC1 = STK465
LS1 = Speaker 40W 8 or 4 Ohm

Stereo Power Amplifier 120W based STK4241V

schematic diagram 7:42 PM No comments:

This is the circuit diagram of stereo power amplifier which use STK4241V as the main component. The amplifier will give you audio power output up to 120W on each channel if you use optimum power supply.

STK4241V features:

Muting circuit built-in to isolate all types of shock noise
Current mirror circuit for low 0.08% total harmonic distortion

3W Class D Audio Amplifier with LM48511

schematic diagram 2:56 PM No comments:

This is the 3W Class-D audio amplifier circuit build using power IC LM48511 manufactured by National Semiconductor. The circuit is very simple with a few external components. The 3W Class D amplifier features a low noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further minimize the requirement for output filters.

Low Impedance Mic Preamplifier using TL081

schematic diagram 2:20 PM No comments:

Low Impedance Mic Preamplifier Circuit using TL081

This is the circuit diagram of low impedance mic preamplifier built based TL081. The circuit is for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don't build the impedance adapter part with T1, you get a mic preamp for higher impedance microphones. In this case, you should directly connect the signal to C7.

30W Audio Power Amplifier

schematic diagram 5:34 PM No comments:

Here the 30W audio amplifier circuit for you who need a low power amplifier, but has good audio output quality and made from distinct components. The circuit design does not have any innovation. In the power stage is a Darlington pair of transistors packed TOP3, which can be screwed onto a heatsink, adding between them and the heatsink suitable leaves mica and ointment silicone for better dissipation of temperature.