Wednesday, October 26, 2011

60W Class AB Audio Amplifier with TDA7294

Here is the circuit diagram of 60W class AB audio amplifier which is built based power IC TDA7294. The TDA7294 amplifier module is a monolithic integrated circuit. It's meant for use as an audio class AB amplifier in hi-fi applications. It has a wide voltage range and output current capability, enabling it to supply the highest power into both 4 ohm and 8n ohm loads. Using the addition of a handful of components and also a appropriate power source, this module will achieve 50W RMS into 8-ohm with 0.1% THD.

60W Class AB Audio Amplifier circuit with TDA7294

You have to provide a heavy duty heatsink rated at 1.4°C/W. Pin 10 will be the MUTE input and pin 9 provides you with a STANDBY mode. Muting ought to always take place just before standby mode is used. Connecting these pins permanently to the power supply rail (insert links) makes sure that the amplifier comes on instantly on power up. Extending the time constants R3-C6 and R4-C5 may possibly eliminate any switch-on clicks. The IC has internal thermal protection that causes the mute to cut in at 145°C and switches the amplifier into standby at 150°C. Don't operate the module without having a heatsink. The heatsink tab on the TDA7294 IC is internally connected towards the negative supply rail. When the module is mounted inside an earthed metal enclosure then the IC has to be insulated from the heatsink. If not, the negative supply rail is going to be shorted to ground.

Power Supply for 60W Class AB Audio Amplifier:

power supply for 60W Audio Amplifier

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

1 comment:

Anonymous said...

Can you send me the full details for this 60W AB amplifier?
Im kinda interest in doing this amplifier, if yes can you forward it to

thanks and all best regards