Some Question About Amp.

Ayne · 8th April 2007, 07:48 AM

First little about me.
I am Learner.. And i am related to Microcontrollers and it's Programming. I never built audio amplifier. I have built buffers with TL072 to using with Micirocontroller but never built Audio Amplifier.

Now i am planing to building an Audio Amplifier. I make search on net i found this.

http://sound.westhost.com/project68.htm

What u say about it??? I need ur suggestions and guidence..
If some one have better design then plz share.
Want to make a high quality and high power amplifier(300~500Watt)

I want to attach the amplifier with My PC(Sound Card). And with MIC.
Is there any need of PreAmplifier between PC and PowerAmplifier??
And If someone have a good Mic pre amp design plz share.

Thanks.

MikeB · 8th April 2007, 08:54 AM

Hi,

i am not sure if you have read the whole page, there are 2 statements that this might not be the right amp for you:
- "DO NOT ATTEMPT THIS AMPLIFIER AS YOUR FIRST PROJECT"
- "Because this amp operates in "pure" Class-B, the high frequency distortion will be relatively high, and is probably unsuited to high power hi-fi."

Maybe you start with something smaller/easier as first project?

Mike

AndrewT · 8th April 2007, 09:57 AM

Hi,
this amp will work, but it has a fixed voltage across the output stage. One cannot alter the bias to optimise the output distortion.

The ESP site has other amplifiers, that are conventional ClassAB designs, with the result they are more suitable for normal music reproduction.

Ayne · 8th April 2007, 11:28 AM

Thanks for reply.

MikeB
U r also on www.electro-tech-online.com ???

Quote:

i am not sure if you have read the whole page, there are 2 statements that this might not be the right amp for you:
- "DO NOT ATTEMPT THIS AMPLIFIER AS YOUR FIRST PROJECT"

First statement for those who never built any electronics project before.

Quote:

Maybe you start with something smaller/easier as first project?

I don't want to waste my money..

Another picture is attached i found . What u sat about it..

If someone have better design then plz share.

Thanks.

MikeB · 8th April 2007, 12:25 PM

Quote:

Originally posted by Ayne

MikeB
U r also on www.electro-tech-online.com ???

No, i don't know this forum, if there is also a MikeB, it's not me...

Quote:

Another picture is attached i found . What u sat about it..

That's my baby, builders are very pleased with its sound, but it's "only" moderate power.

Mike

Ayne · 8th April 2007, 07:37 PM

Oh. I read previous pages on this web i found that u(MikeB) made symasym5..

I think i should go with symasym5.. What u say MikeB.. Are u satisfied with ur symasym5???

Is there any need of PreAmplifier b/w PC sound card and symasym5????

I also want to attach a mic with Selector Switch. Needed MIC pre Amplifier.. Plz Help.

Thanks MikeB.

MikeB · 8th April 2007, 07:58 PM

Yes, i am satisfied with symasym, but i am biased...

You can drive symasym without preamp from soundcard or CD-Player.
For the mic you will definitely need a preamp, but i have no experience with that.

Mike

jaycee · 8th April 2007, 10:09 PM

If this is your first amplifier, I would recommend going with some chip amplifier. A power amp is as much about PCB design and layout as it is about parts... and mistakes can be extremely costly.

On the other hand, the symasym is well proven, and there is a PCB layout already made and available.. as long as you make the PCB well enough you should have few issues. Just be aware that working with power amps is a lot more tricky than working with a microcontroller.

Conrad Hoffman · 8th April 2007, 10:22 PM

If this is your first *discrete* amplifier, I'd suggest building something very low power, purely as a learning exercise. Find a similar design in the 10-30 watt region and build that. You'll learn many things that will help you with the bigger one. You don't want to waste your money, and starting with a very high power amplifier is sure to do that- parts will turn into smoke, poor ground return design will give you high distortion, and after the chassis work is done, you'll see how you could have done it better. Even if you give the small amplifier away, it will have served its purpose and allowed you to build a much better big amplifier. I'd also suggest getting Doug Self's audio power amplifier design book, and others that have been mentioned in various threads here.

radio · 9th September 2011, 06:22 AM

Dear Sirs!

I want to create an amplifier per cent of this is complete!
So please, if someone is able to work that details the description of this amplifier?!

Otherwise, attached below is given PCB for this amplifier!
thanks and cheers

8th April 2007, 07:48 AM	#1
Ayne diyAudio Member Join Date: Apr 2007	Some Question About Amp. First little about me. I am Learner.. And i am related to Microcontrollers and it's Programming. I never built audio amplifier. I have built buffers with TL072 to using with Micirocontroller but never built Audio Amplifier. Now i am planing to building an Audio Amplifier. I make search on net i found this. http://sound.westhost.com/project68.htm What u say about it??? I need ur suggestions and guidence.. If some one have better design then plz share. Want to make a high quality and high power amplifier(300~500Watt) I want to attach the amplifier with My PC(Sound Card). And with MIC. Is there any need of PreAmplifier between PC and PowerAmplifier?? And If someone have a good Mic pre amp design plz share. Thanks.

8th April 2007, 09:57 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, this amp will work, but it has a fixed voltage across the output stage. One cannot alter the bias to optimise the output distortion. The ESP site has other amplifiers, that are conventional ClassAB designs, with the result they are more suitable for normal music reproduction. __________________ regards Andrew T.

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8th April 2007, 08:54 AM	#2
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	Hi, i am not sure if you have read the whole page, there are 2 statements that this might not be the right amp for you: - "DO NOT ATTEMPT THIS AMPLIFIER AS YOUR FIRST PROJECT" - "Because this amp operates in "pure" Class-B, the high frequency distortion will be relatively high, and is probably unsuited to high power hi-fi." Maybe you start with something smaller/easier as first project? Mike

8th April 2007, 07:37 PM	#6
Ayne diyAudio Member Join Date: Apr 2007	Oh. I read previous pages on this web i found that u(MikeB) made symasym5.. I think i should go with symasym5.. What u say MikeB.. Are u satisfied with ur symasym5??? Is there any need of PreAmplifier b/w PC sound card and symasym5???? I also want to attach a mic with Selector Switch. Needed MIC pre Amplifier.. Plz Help. Thanks MikeB.

8th April 2007, 07:58 PM	#7
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	Yes, i am satisfied with symasym, but i am biased... You can drive symasym without preamp from soundcard or CD-Player. For the mic you will definitely need a preamp, but i have no experience with that. Mike

8th April 2007, 10:09 PM	#8
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	If this is your first amplifier, I would recommend going with some chip amplifier. A power amp is as much about PCB design and layout as it is about parts... and mistakes can be extremely costly. On the other hand, the symasym is well proven, and there is a PCB layout already made and available.. as long as you make the PCB well enough you should have few issues. Just be aware that working with power amps is a lot more tricky than working with a microcontroller.

8th April 2007, 10:22 PM	#9
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	If this is your first discrete amplifier, I'd suggest building something very low power, purely as a learning exercise. Find a similar design in the 10-30 watt region and build that. You'll learn many things that will help you with the bigger one. You don't want to waste your money, and starting with a very high power amplifier is sure to do that- parts will turn into smoke, poor ground return design will give you high distortion, and after the chassis work is done, you'll see how you could have done it better. Even if you give the small amplifier away, it will have served its purpose and allowed you to build a much better big amplifier. I'd also suggest getting Doug Self's audio power amplifier design book, and others that have been mentioned in various threads here.

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