Explendid amplifier designed by Michael Bittner, our MikeB - diyAudio
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Old 16th July 2005, 10:14 PM   #1
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Default Explendid amplifier designed by Michael Bittner, our MikeB

MikeB, our forum friend, is 30 years old Computer Programer, owner of the Synetic Software.

As he is working very hard those days, having small time to sleep, he asked me to publish his amplifier, result of some monthes of research, where i could cooperate with my ears with the valuable help of Mr. John Mateus from Fredon - New Jersey - USA the one that constructed, evaluate and helped a lot including his enormous professional experience in audio reinforcing our evaluations.

His amplifier is called Symasym, that is Symetrical Assymetrical, a very good design, the one i use to listen, together with GEM, AKSA and JLH...i apreciate, very much, all of them, and cannot stay without those units..in my idea, the best i could find using BGTs.

Alike many others, that use 36 or 37V simetrical supply, it produces 50 watts RMS minimum over 8 ohms and go to 100 watts over 4 ohms, naturally.

Long research was made, many comparisons where made, that had Hugh Dean cooperation, also Graham Maynard cooperation and some others that are not in our diy audio forum.

Professional audio recordings were made and E-mailed in 10 to 20 Megabytes size, using Wave and MP3, with comparisons made using reference amplifiers, in this case, a very expensive Yamaha Home Theater, the JLH basic and first design, and one Harman and Kardon.
Audio was generated by sinthetizers and Graham Maynard sent a beautifull CD, the one you can perceive very deep low humble from pickup and turntable, we could see woofer moving 5 hertz.

Recordings was made using Professional Senheiser Microfone... 1 meter distanced from speaker.... sound recorded was a DAT recorder and them copied to the computer audio board, converted to MP3 and also mailed as Wave.

The amplifier is very good...try it.

Very good audio reproduction is guaranteed

regards,

Carlos
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File Type: gif symasym4.gif (13.3 KB, 41717 views)
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Old 16th July 2005, 10:20 PM   #2
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Default Information of voltages

Here is the image.

regards,

Carlos
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File Type: gif symasym4 voltage.gif (19.2 KB, 34490 views)
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Old 16th July 2005, 10:21 PM   #3
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Default Information of current

here is the image.

regards,

Carlos
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File Type: gif symasym4 current.gif (19.7 KB, 31745 views)
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Old 16th July 2005, 10:22 PM   #4
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Default To produce your board.

Here is the image.

regards,

Carlos
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File Type: jpg printed copper traces.jpg (90.6 KB, 31380 views)
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Old 16th July 2005, 10:24 PM   #5
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Default Close up or the copper side.

Here is the image.

regards,

Carlos
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File Type: jpg close up copper side.jpg (89.1 KB, 30314 views)
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Old 16th July 2005, 10:25 PM   #6
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Default One view of the bottom.

Here it is.

regards,

Carlos
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File Type: jpg bottom1.jpg (72.2 KB, 23077 views)
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Old 16th July 2005, 10:27 PM   #7
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Default Another bottom view to help checking.

Here is the image.

regards,

Carlos
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File Type: jpg bottom2.jpg (86.3 KB, 22025 views)
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Old 16th July 2005, 10:29 PM   #8
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Default Mr. John Mateus, Le Baron of Saint Ivy, made his own board.

Very pretty hand made board...result was wonderfull, unfortunattelly i have not a good picture.

He is our forum friend, Jmateus.

regards,

Carlos
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File Type: jpg mateus board.jpg (93.2 KB, 25139 views)
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Old 16th July 2005, 10:30 PM   #9
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Default More details about John Mateus job.

His method is a little different, as do not use computer to design boards...he do with his eyes, experience and hands habilities.

regards,

Carlos
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File Type: jpg mateus layout.jpg (96.7 KB, 25469 views)
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Old 16th July 2005, 10:32 PM   #10
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Default MikeB also produces "Focasym", this one i did not constructed.

Because already satisfied with Symasym4.

regards,

Carlos
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File Type: jpg focasym.jpg (86.1 KB, 25643 views)
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