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How to make an audio amplifier circuit to power a speaker? Answered

I have a 4 Ohm 90 Watt Speaker and I want to be able to play music from my phone on that speaker. I know I need to give the audio signal more power so that it can be used with the speaker, but how do I do this? I have found other circuits on Instructables that accomplish the same task but they are all for much less powerful speakers and only produce less than 1 watt. Any solutions? Thanks

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rickharris

3 years ago

Your best option will be to use one of the integrated circuit (IC) amplifiers that are well established..

As a start i suggest you go for an LM386.

https://www.instructables.com/id/LM386-Audio-Amplif...

with a few extra components this makes a reasonable low power amplifier that should drive your speakers.

There are other higher powered IC amps around but the 386 is cheap and easy to assemble.

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Wired_Mist

3 years ago

Your going to have to search Ebay (And trust your not buying Garbage)

http://www.aliexpress.com/item/HIFI-Parallel-Mono-...

Most online stores like SparkFun and Adafruit will only carry lower powered Amps. You could also try a Car mono amp but it will be a bit more expensive !

Either way Check the Spec's. Most amps will support 4-Ohm