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Portable Amp using MC33171? Answered

Sir, I am really sorry to ask this but i don't know much about electronics but i want to make portable amp for speakers using MC33171 but I don't know which capacitors and resistors to connect to it. Please can you tell me which components i should use. I am gonna use DC current ,around 3.7 to 4.5 voltage.
Thank you



Quercus austrina

Best Answer 7 years ago

That particular IC is not a power amp, rather, it is better suited as a preamp. What most people do (in this day and age) for a first time portable amp is use the ubiquitous LM386 low power audio amplifier. This is a low power single IC (chip) that uses a minimal amount of external components to create a complete single channel amp capable of driving a typical speaker. Note that this chip is a single amp, and if you want stereo you must build 2 of them, one each for the left and right channels. The bonus of using this IC is that it will work down to 4 Volts, though I'd maximize your available voltage to run it.

There are plenty of 'ibles here. just do a search for LM386 and you'll have scads to choose from.

In the future, if you want to progress to something a bit more powerful for home use, look at this thread for a Losmandy Amplifier that uses an op-amp similar to the one you've mentioned. Just click on the link in the post. Extremely simple and easy to build.


Quercus austrinaharryjone

Answer 7 years ago

You are quite welcome. Always willing to help those who are starting out. I find that those who are encouraged early on tend to go to greater heights. I hope you will.



7 years ago

That's a very bad choice for a power amp, it won't work.