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View Full Version : Make own speaker amplifier

weitao
Dec15-10, 02:43 AM
How to build this amplifier ? Need what component!!!
berkeman
Dec15-10, 01:30 PM
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?sourceid=navclient&aq=0&oq=build+speaker+amp&ie=UTF-8&rlz=1T4GGLL_enUS301US302&q=build+speaker+amplifier

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waht
Dec15-10, 01:42 PM
If you want to play around with transistors you can build a class AB amplifier:

http://www.eetasia.com/ARTICLES/2006JAN/2/EEOL_2006JAN13_ACC_NP_05.gif

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

http://www.hobby-hour.com/electronics/lm386-200.gif
weitao
Dec19-10, 09:57 AM
What transistor? NPN or PNP?
berkeman
Dec19-10, 01:56 PM
What transistor? NPN or PNP?

waht's first circuit contains one of each, right?
weitao
Dec19-10, 08:44 PM
Ya !!! Which transistor? And how to adjust the base? And second circuit, what is mean by "by pass"?
Averagesupernova
Dec20-10, 10:40 AM
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 waht 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
Dec20-10, 11:29 AM
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
Dec21-10, 08:02 AM
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 waht 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!!!