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Old 22nd November 2012, 12:44 AM   #1
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Default Beginner needing guidance

Hello,

This is my first post here!!

Well, Iím planning to build amplifiers.

But, as Iím planning to do it right, Iíll build a rectifier and a filter for the power, otherwise Iíll probably have lots of distortions.

As I donít have a good knowledge of electronics yet (I'm a sophomore in college), Iíll begin by building already designed circuits. And I need to know how to measure the distortion, the harmonics (and if there are other measures, please comment) of a circuit. I donít know if the methods are the same for amplifiers, rectifiers and filters. And please donít say that Iíll need to buy those expensive equipment...

About the options that I have for rectifiers, Iíve seen a projects with op-amp in feedback, is it good for audio?

And do you know any website, book, article, anything that youíd suggest for a beginner? (e.g. Decibel Dungeon)

Thank you in advance.
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Old 22nd November 2012, 01:08 AM   #2
Speakerholic
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Hi and welcome. Have you decided what type of amplifier you would like to build? If so, pick a forum that meets your needs and post there.

Good luck.
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Old 22nd November 2012, 01:13 AM   #3
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If you want an easy start you could build a chip amp.
Most of the work is done by the chip with a few external components.
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Old 22nd November 2012, 10:49 AM   #4
DF96 is offline DF96  England
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Buy Horowitz and Hill. Read it slowly. Don't be alarmed if the later chapters look too difficult at first.
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Old 22nd November 2012, 02:18 PM   #5
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Quote:
Originally Posted by ziongh View Post
And I need to know how to measure the distortion, the harmonics (and if there are other measures, please comment) of a circuit.
As a beginner, you should focus on building amplifiers that actually work. As far as measurements, quiescent currents and output offset voltages should be your focus. Once mastering this, you can focus on distortion.

Chip amps are great for beginners, but you still need to be vigilant for oscillation, instability, and noise pickup. Build one and debug it and you'll learn a lot.

You can check for oscillation without a scope. High pass filter- high frequency sample and hold- VOM will tell you if it's oscillating or not. And use a zobel network whether your circuit calls for one or not.
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Old 23rd November 2012, 05:41 PM   #6
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Thank you all for the replies!!

I've found the book that DF96 indicated me. It's great, but i'll need some time to read it, fortunately my vacation is near.

About the chip amps, i'll probably build one to get some experience. But my goal is to design amps, or at least analyse already designed ones, and try to improve it.

And thank you, Fast Eddie D, for your construction tips!!
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