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Old 15th January 2004, 11:22 AM   #11
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I am not using 741, it´s a simple scheme. I am using the LM386 with 100 of gain.
When i put the speaker on the output of LM386, the sounds is very good. The problem is the output stage.

My question is about the output stage.

The Crossover distorcion is low.

Can one help me one the OutPut stage ????
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Old 15th January 2004, 12:31 PM   #12
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What type of amplifier are you trying to design?
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Old 15th January 2004, 12:45 PM   #13
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Sorry, Mr Brasil, you have much to learn but you can take shortcut by looking at this amp:

http://www.audio-circuit.dk/LYNX_main.html
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Old 15th January 2004, 01:04 PM   #14
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Quote:
Originally posted by peranders
Sorry, Mr Brasil, you have much to learn but you can take shortcut by looking at this amp:

http://www.audio-circuit.dk/LYNX_main.html
If he just want's to get something running maybe. If he also
wants to learn how amplifiers work then it is not a good one
to start with in my opinion. Already the way the op amp is
used is likely to confuse him for ages considering what his
present knowledge of electronics seems to be.

I think he said he actually didn't use a 741 but some op amp
that could take the higher voltage (if I understood him right).
Then maybe he just needs to buffer it for current capability.
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Old 15th January 2004, 01:05 PM   #15
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Quote:
Originally posted by Richard C
What type of amplifier are you trying to design?

A Class B Amplifier
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Old 15th January 2004, 01:31 PM   #16
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Quote:
Originally posted by PicancoNet
I am not using 741, it´s a simple scheme. I am using the LM386 with 100 of gain.
When i put the speaker on the output of LM386, the sounds is very good. The problem is the output stage.

Can one help me one the OutPut stage ????

it is hard to fix. the lm386 is a power amp ic for single rail applications. so you may have to a lot of tweaking to get it to work in a dual rail applications.

One concept to consider is here:

http://www.diyaudio.com/forums/showt...929#post182929

and it should work with your lm386, but you need to do so in a single rail fashion, with DC blocking on the output and no external gain setting resistors (probably not so great performance).
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Old 28th January 2004, 10:35 AM   #17
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Quote:
Originally posted by millwood



it is hard to fix. the lm386 is a power amp ic for single rail applications. so you may have to a lot of tweaking to get it to work in a dual rail applications.

One concept to consider is here:

http://www.diyaudio.com/forums/showt...929#post182929

and it should work with your lm386, but you need to do so in a single rail fashion, with DC blocking on the output and no external gain setting resistors (probably not so great performance).

But, i'm using single rail on my amp !!!

And i have a capacitor between the transitors emiters and the output !!!
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Old 28th January 2004, 03:51 PM   #18
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Default At least it won't blow up much.

The output and driver stages have base emitter shorts. After the 741 evaporates not much else can happen.

I really, really suggest you just copy someone elses amplifier as it is obvious you know very little about amplifier design. It is not as easy as it looks but you need education on transistor biasing, feedback networks and device selection. At least study other designs and determine why each part is there. Designers do not put in parts for no reason. Every part serves a purpose and if the designer did not feel it was justified, it would not be there.

The way I learned amplifier design was by first building copies of other people's amplifiers. It took me perhaps 10 years of this before I could design a reliable, good sounding amplifier.

Good Luck.
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Old 30th January 2004, 07:00 AM   #19
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I started out trying to build amps based on opamps driving current gain stages becuase they were easy and they work when done right.

There's nothing more satisfying though, IMO, then designing and building your own discrete amplifier.

All you need is the will and the time and it'll all fall together.

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Old 30th January 2004, 08:51 AM   #20
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I would have to say the same thing.

A bunch of my early posts here at diyaudio demonstrate when I was trying to get into amplifiers but didn't know enough theory.

After working a great deal with other's designs and reverse engineering, I have become able to design my own amplifiers.

It's a very tricky thing to accomplish, but once you do, it becomes second nature after some good hard practice.

Just recently I designed and built a four channel 450W/ch amplifier similar to some designs I have seen. It uses CFP output, balanced input with mirrors, CCS, VAS with CCS, Vbe multiplier bias, etc. Basically a mix of the blameless amplifier by D. Self and some of Rod Elliot's designs on his site. With my own selection of parts and values and configuration. I designed it out of known theory in my head, put it on paper, checked it out, and then built it.

I am very pleased with the design, it sounds very good and it's really stable. The trick of it all is that I spent 6 years studying theories and only within the past year have I been able to successfully design something this nice.

It definitely takes a lot of work, as any engineer or hobby DIY'er will tell you.
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