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Old 23rd November 2007, 01:47 PM   #1
geminni is offline geminni  Yugoslavia
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Default High quality 40-60w amplifier

I have a bunch of a BD911 and BD912, had full of BC-s, and transformer with 2x20v ac. That gives about 2x40w at 6 ohm. I have tried to find schematic for this kind voltage but found couple of "no name" type schematics.

Can anyone suggest some fairy simple schematic for 2x28V but some good quality amp?

I'll try to find schematic that i have made but I'm not pleased with it because it's midrange is very bad sounding

Also, i must say that, building amp with Lm3886 and similar maybe is faster but it takes away all the fun of building one
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Old 23rd November 2007, 03:06 PM   #2
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Elliot P3A or any Lin-Bailey Class AB/B variant, like the Elektor Darlington amplifier from 1982 by T. Giesberts. This topology gives excellent performance, while leaving a lot of room for sonic tweaking, a la Hugh Dean's AKSA and its higher-end upgrades.
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Old 23rd November 2007, 03:16 PM   #3
Twaksak is offline Twaksak  South Africa
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How about the bameless amp from Self. If I had components laying around that would be interesting for me. All types of distortions cancelled out as per Douglas Self. A very clear and precise amplifier indeed.
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Old 23rd November 2007, 03:29 PM   #4
Donk is offline Donk  Europe
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My 50W/4Ohm 30W/8Ohm error-correction amplifier design using dirty cheap parts.
Your 2*20Vac transformer will be just OK. Use 10.000uF-35/50V elkos for PSU.
Attached Images
File Type: png ec50_s.png (27.6 KB, 2160 views)
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Old 23rd November 2007, 03:31 PM   #5
Donk is offline Donk  Europe
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PCB (non-mirrored!)
http://forum.audiodiy.hu/download.php?id=2059
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Old 23rd November 2007, 03:35 PM   #6
Donk is offline Donk  Europe
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Placing

Green lines are wire links, blue line is the heatsink of BD139

http://forum.audiodiy.hu/download.php?id=2058

2.2uH coil is air-cored, 23 turns of D=1mm enamelled cooper wire, on 10mm former, length is 24mm

Amp performance: THD and IMD <0.01%, ...50W, 20Hz...20kHz
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Old 23rd November 2007, 07:08 PM   #7
geminni is offline geminni  Yugoslavia
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Wow! Thanks guys!

Now i don't know which to do first
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Old 24th November 2007, 01:01 AM   #8
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Hi, Donk,

I'm very interested in your CCT, but unfortunately I don't understand it. How does your EC work?
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Old 24th November 2007, 10:39 AM   #9
pintur is online now pintur  Italy
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Very nice, Donk.

It seems to be inspired to Quad 405' s current-dumping topology.
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Old 25th November 2007, 12:26 PM   #10
Donk is offline Donk  Europe
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Hi guys,

Lumanauw, see the following links for working method of my amplifier:
http://www.google.com/patents?id=t6I...BAJ&dq=3970953
http://forum.audiodiy.hu/files/ec50_m_460.jpg


Be careful, the attached schematic is only a test version, a prototype, It's not a final version!

There is a fault in the circuit and on the PCB-placing: the three 1N4148s in serial need to be three 1N4002s in serial!!!
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