Are Basic Electronics Enough to Build a Speaker Amplifier?

[weitao]

How to build this amplifier ? Need what component!

 

[berkeman]

How to build this amplifier ? Need what component!

That's a very broad question. So I'll supply a broad answer. I googled build speaker amplifier, and got lots of good hits. Have a look through the hit list, and see if it answers your question.

http://www.google.com/search?source...T4GGLL_enUS301US302&q=build+speaker+amplifier

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[waht]

If you want to play around with transistors you can build a class AB amplifier:

or you could build a simple amplifier with a chip LM386:

 

[weitao]

What transistor? NPN or PNP?

 

[berkeman]

What transistor? NPN or PNP?

what's first circuit contains one of each, right?

 

[weitao]

Ya ! Which transistor? And how to adjust the base? And second circuit, what is mean by "by pass"?

 

[Averagesupernova]

I don't think this forum is the place to be looking for advice and circuits to build when a person can't tell the difference between an NPN and a PNP transistor from looking at the schematic. There are several other things omitted from the schematic that what posted as well. Not that it isn't a workable circuit, but it is not a turnkey solution. It is a place to start.

 

[berkeman]

Ya ! Which transistor? And how to adjust the base? And second circuit, what is mean by "by pass"?

I agree with supernova -- you are not ready to make an audio amplifier from scratch.

But, you may be ready and interested in building an audio amplifier kit. That's a great way to learn how to build electronic circuits, and each kit generally comes with tutorial materials to help you understand how it works.

Have a look at these kits:

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLL_enUS301US302&q=audio+amp+kit

You can also just look at the electronics store nearest you (Radio Shack, Frys Electronics, etc.) at their kits.

 

[weitao]

I don't think this forum is the place to be looking for advice and circuits to build when a person can't tell the difference between an NPN and a PNP transistor from looking at the schematic. There are several other things omitted from the schematic that what posted as well. Not that it isn't a workable circuit, but it is not a turnkey solution. It is a place to start.

Not me can't see the difference but have PNP and NPN transitor in first diagram and I just learn basic electronic only!