i am new in this forum, need help

space2000 · 8th March 2008, 01:38 PM

Hi,

I am new in this forum. I need help from you guys. I am intending to make a power audio amplifier. I had Visited few web site and saw there are many circuit design about 100w using transistor. But I need to know which type of transistor will be high quality sound with reasonable price. There is mosfet or drilington type of transistor. Any one can suggest me which will be batter to make A class quality power amplifier? I don’t want to use valve type. I need 100w RMS power into 8ohms speaker.

Thank you for your help.

TheMG · 8th March 2008, 03:58 PM

100W/ch/8ohm class A amplifier? That's insane!

You do realize the ridiculous amount of heat that is going to generate constantly, right? You're going to be spending more money on heat sinks than anything.

AndrewT · 8th March 2008, 04:03 PM

Hi,
go and read the KSA100 thread. It's a 100W into 8ohm ClassA power amplifier.
Then decide whether you want to go with BJT or FET

Worth downloading the various PASS amplifiers and papers on various types of ClassA.

Gordy · 8th March 2008, 07:15 PM

Have a look at some of the kits / amps mentioned here:

Reference DIY amplifiers

space2000 · 9th March 2008, 07:48 AM

hi,

Thank you for your helps. I just need 80 to 100 wats rms on 8ohms but the operate voltage should be 30 to 40v+-. I need good sound quality circuit diagram. Those are using transistor in moderate price rate.

Thank you.

djk · 9th March 2008, 10:10 AM

" I just need 80 to 100 wats rms on 8ohms but the operate voltage should be 30 to 40v+-. "

Right, can not be done.

Read the KSA100 thread.

If you really want 100W/8R you will want to use a 35-0-35 transformer of at least 400VA per channel.

MikeB · 9th March 2008, 10:25 AM

Quote:

Originally posted by space2000
I just need 80 to 100 wats rms on 8ohms but the operate voltage should be 30 to 40v+-. I need good sound quality circuit diagram. Those are using transistor in moderate price rate.

You might have look at SymAsym, it is quite simple. It is intended for +/- 36v and will give you ~60w into 8ohms, the power you get with this supply voltage.
Click my www or search the forum.

Mike

space2000 · 12th March 2008, 12:17 AM

hi, can i use 2sc5200 as bridging? how to do it? is there any circuit?

thank you.

Leolabs · 12th March 2008, 02:01 AM

You can go for near 100W@8ohms with +/-40V,but your driver stage supply voltage should be 5 to 10V higher.

8th March 2008, 01:38 PM	#1
space2000 diyAudio Member Join Date: Mar 2008	i am new in this forum, need help Hi, I am new in this forum. I need help from you guys. I am intending to make a power audio amplifier. I had Visited few web site and saw there are many circuit design about 100w using transistor. But I need to know which type of transistor will be high quality sound with reasonable price. There is mosfet or drilington type of transistor. Any one can suggest me which will be batter to make A class quality power amplifier? I don’t want to use valve type. I need 100w RMS power into 8ohms speaker. Thank you for your help.

8th March 2008, 04:03 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, go and read the KSA100 thread. It's a 100W into 8ohm ClassA power amplifier. Then decide whether you want to go with BJT or FET Worth downloading the various PASS amplifiers and papers on various types of ClassA. __________________ regards Andrew T.

9th March 2008, 07:48 AM	#5
space2000 diyAudio Member Join Date: Mar 2008	needed circuit design for 80 to 100 wats hi, Thank you for your helps. I just need 80 to 100 wats rms on 8ohms but the operate voltage should be 30 to 40v+-. I need good sound quality circuit diagram. Those are using transistor in moderate price rate. Thank you.

9th March 2008, 10:10 AM	#6
djk diyAudio Member Join Date: Feb 2001 Location: USA	" I just need 80 to 100 wats rms on 8ohms but the operate voltage should be 30 to 40v+-. " Right, can not be done. Read the KSA100 thread. If you really want 100W/8R you will want to use a 35-0-35 transformer of at least 400VA per channel. __________________ Candidates for the Darwin Award should not read this author.

12th March 2008, 12:17 AM	#8
space2000 diyAudio Member Join Date: Mar 2008	2sc5200 hi, can i use 2sc5200 as bridging? how to do it? is there any circuit? thank you.


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8th March 2008, 03:58 PM	#2
TheMG diyAudio Member Join Date: Jan 2008	100W/ch/8ohm class A amplifier? That's insane! You do realize the ridiculous amount of heat that is going to generate constantly, right? You're going to be spending more money on heat sinks than anything.

8th March 2008, 07:15 PM	#4
Gordy diyAudio Member Join Date: Nov 2006	Have a look at some of the kits / amps mentioned here: Reference DIY amplifiers

12th March 2008, 02:01 AM	#9
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	You can go for near 100W@8ohms with +/-40V,but your driver stage supply voltage should be 5 to 10V higher.

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