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Audio power amplifier design how to#
Audio power amplifier design driver#

While the input signal to an audio power amplifier, such as the signal from an electric guitar, may measure only a few hundred microwatts, its output may be a few watts for small consumer electronics devices, such as clock radios, tens or hundreds of watts for a home stereo system, several thousand watts for a nightclub's sound system or tens of thousands of watts for a large rock concert sound reinforcement system.

Most audio power amplifiers require these low-level inputs, which are line level.

The inputs can also be any number of audio sources like record players, CD players, digital audio players and cassette players. The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification of the signal (this is particularly associated with record turntable signals, microphone signals and electric instrument signals from pickups, such as the electric guitar and electric bass), equalization (e.g., adjusting the bass and treble), tone controls, mixing different input signals or adding electronic effects such as reverb. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers. Audio power amplifiers are found in all manner of sound systems including sound reinforcement, public address and home audio systems and musical instrument amplifiers like guitar amplifiers. But it'd be too long to put in the comments.The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) Īn audio power amplifier (or power amp) is an electronic amplifier that amplifies low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is high enough for driving loudspeakers or headphones. Note to the mods: I know that this is not an answer. You can't just put that +1V headroom randomly. I then set Vcc=Vo peak*2 +1 which gives 27V. I got Vo peak as √(10 * 8 * 2) which gives 12.65V.

Audio power amplifier design how to#

If you had shown what you have tried so far then it would give a clue about your level and I'm sure that the experts here would show you where/what you did wrong and how to fix. We don't know your level of each topic above. And it's almost impossible to learn how to design one from a simple answer posted here, believe me. So, as you can see, a Class AB audio amplifier is not a "how can I design one?" thing.

And even a very basic understanding of feedback theory.

It appears that you've listed those, so that's a start.Ī Class-AB audio amplifier involves three stages: How to design that first (voltage gain) stage?Įvery design process starts with listing the requirements. So you need a transistor in the voltage amplifier (gain of 9/0.5 = 18x) able toĭissipate 0.2 watts. WIth 20mA Icollector and 40 volts, the maximum power dissipation of your first transistor (that common emitter) will be 20mA/2 * 40 volts/2 (for passive loads), or 10mA * 20Volt = 0.2 watts. So plan to operate that first transistor at 0.020 amps. And assume another 10mA to provide pullup to the +40 volts. What to do? The base currents will tend to cancel, so assume 10mA (net) into the two output transistors. One amp / Beta = 100 => Ibase of 0.010 amp = 10mA. Many milliAmps, because of 1 amp+ Iout, and moderate beta of the two output transistors. The topology of common_emitter amplifier, into a resistive load, has maximum voltage gain of VDD / 0.026 with 40 volts / 0.026 (or 40 * 39), the maximum gain is nearly 1,600. The final circuit I came up with is shown.įor 10 watts into 8 ohm speaker, you can do this system designġ0 * 8 = V * V thus Vrms_out ~~ 9 volts RMS, or 2.828 * 9 peakPead When I simulate the circuit, the output voltage is quite small and the output power is much less than 10W.

Audio power amplifier design driver#

Image source: Electronics Tutorials - Class AB Amplifier Driver Stage The bandwidth is to cover the range from 20Hz to 18kHz. I am required to design a class AB audio amplifier to deliver 10W to an 8Ω speaker as shown, but I don't know where to start.