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Old 8th August 2007, 08:19 AM   #1
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Question HELP-- I need a simple 50W AMP circuit ---

HELP----- I need a simple 50w AMP circuit ------
Hi every one.
I am going to build a small amp base on some spare part. Could any one give me a simple 50w class AB circuit? I am prefer Sweet, warmth sounds with good bass control .(Martin2599@hotmail.com)

------------ Thanks very much!!!!!!!!-----------

I have:
1 x 300w Transformer: 32V AC / +- 42VDC
2 x Power Transistors: 2SA1302 /2SC3281
2 x Driving Transistors: 2SA1306 / 2SC3098
2 x 2SC4137
2 x 2SC1845 / 2SA992
And some other small transistors and caps.
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Old 8th August 2007, 10:23 AM   #2
Gordy is offline Gordy  United Kingdom
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Join Date: Nov 2006
I can not answer your question exactly, however you may get some ideas from the links and information in the Reference DIY amplifiers thread:
Reference DIY amplifiers
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Old 8th August 2007, 10:44 AM   #3
Bone is online now Bone  United Kingdom
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Join Date: Jun 2004
Location: Dorset, UK
Why not build the P3a from Elliott Sound Products Australia http://sound.westhost.com/project3a.htm
You will need some PNP driver transistors however.

There is even a PCB available

Tony
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Old 8th August 2007, 02:16 PM   #4
AndrewT is online now AndrewT  Scotland
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Location: Scottish Borders
Default Re: HELP-- I need a simple 50W AMP circuit ---

Quote:
Originally posted by MTO audio
I have:
1 x 300w Transformer: 32V AC / +- 42VDC
2 x Power Transistors: 2SA1302 /2SC3281
2 x Driving Transistors: 2SA1306 / 2SC3098
2 x 2SC4137
2 x 2SC1845 / 2SA992
And some other small transistors and caps.
If you had 4pair of 2sa1302/c3281 or their replacement 2sa1943/c5200 you could get 100W+100W into 4ohms from that transformer.

It would be a bit of a waste to only take 50W into 8ohm from it. That's the most I would recommend from 1pair of genuine 2sa1302/C3281.
I think you are more likely to get +-46Vdc from the 32Vac windings when fed with nominal input voltage.
__________________
regards Andrew T.
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Old 9th August 2007, 12:01 AM   #5
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Join Date: Jul 2007
Wink thanks every one

hi, all my parts are comes from a damaged Pioneer A400, i am using a Pioneer A400X at the moment.
i just want to DIY a amp that has better bass control then A400x does. so any one could help me out?

thanks a lot !!!!!
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Old 9th August 2007, 07:46 AM   #6
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Join Date: Jul 2007
Default Hi, it may be usefull for A400/A400x owner

link to A400 and A400x manual: http://www.hifiengine.com/manuals_ty...oneer&mod=A400
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