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1 Sep 2010

Cheap Audio Booster - [Link]

1 Sep 2010

Most audio amplifier systems must have preamplifiers with many different characteristics. These include high-gain linear response for magnetic microphones, low-gain linear response for tuners, and high-gain RIAA equalization for magnetic phone cartridges.

Universal Preamplifier - [Link]

1 Sep 2010

Above circuits are based on TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package manufactured by UTC .Circuit has an Internal Thermal Protector. It is designed for portable cassette players and radios.

Portable Audio Amplifiers - [Link]

1 Sep 2010

The circuit is based around {LM4702}manufactured by NATIONAL semiconductors&{MJ11029-MJ11028} by ON semiconductors It is a high fidelity audio power amplifier. Designed for demanding consumer and pro-audio applications.

600W Audio Amplifier – [Link]

1 Sep 2010

This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20dB for loud sounds.

Sound Level Indicator – [Link]

1 Sep 2010

Simple and low cost. The optimal supply voltage is around 50V, but this amp work from 30 to 60V. The maximal input voltage is around 0.8 – 1V. As you can see, in this design the components have a big tolerance, so you can build it almost of the components, which you find at home. The and transistors can be any NPN type power transistor, but do not use Darlington types… The output power is around 60W.

2N3055 Power Amplifier - [Link]

1 Sep 2010

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

Motorola Hi-Fi power amplifier – [Link]

1 Sep 2010

This is a simple bridge amplifier based on TDA7240A. This circuit is designed for car audio system, but you may use this circuit for your small home audio application…

20W Bridge Amplifier using TDA7240A – [Link]

28 Aug 2010

This project is a 20W audio amplifier based on LM1875 IC from National Semiconductors. With a 25V dual power supply LM1875 can deliver 20W of audio power into a 4 ohm speaker.

20W audio amplifier using LM1875 - [Link]

26 Aug 2010

This circuit is a MOSFET Audio Amplifier rated at 25 Watt. It is high quality and simple design. There is also a kit available on the link below.

25 Watt MosFet Audio Amplifier - [Link]





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