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Old 8th March 2008, 01:38 PM   #1
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Cool 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.
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Old 8th March 2008, 03:58 PM   #2
TheMG is offline TheMG  Canada
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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.
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Old 8th March 2008, 04:03 PM   #3
AndrewT is offline AndrewT  Scotland
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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.
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Old 8th March 2008, 07:15 PM   #4
Gordy is offline Gordy  United Kingdom
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Have a look at some of the kits / amps mentioned here:

Reference DIY amplifiers
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Old 9th March 2008, 07:48 AM   #5
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Default 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.
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Old 9th March 2008, 10:10 AM   #6
djk is offline djk
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" 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.
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Old 9th March 2008, 10:25 AM   #7
MikeB is offline MikeB  Germany
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Default Re: needed circuit design for 80 to 100 wats

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
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Old 12th March 2008, 12:17 AM   #8
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Default 2sc5200

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

thank you.
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Old 12th March 2008, 02:01 AM   #9
Leolabs is offline Leolabs  Malaysia
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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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