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Old 3rd August 2011, 02:23 PM   #11
juma is offline juma  Germany
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Maybe it wouldn't be a bad idea to add one small pot to control the DC offset at the output...
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Old 3rd August 2011, 02:50 PM   #12
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Actually we can make offset control, simply by changing 1k resistor closest to BF471 into multi-turn trimmer. Current imbalance (Hfe & Ube difference of the input pair) causing offset would be elegantly compensated in that way
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Old 3rd August 2011, 03:01 PM   #13
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Quote:
Originally Posted by MarianB View Post
Correct me if i'm wrong but i think we are not always looking for perfection when building an amp, sometimes we need a simple low cost low power amp and this one looks just fine i think
I agree completely. But my intention and priority is always sound quality and musicality (enjoyment factor at listening), since that is hardly achievable from complex designes. I stoped built complicated ones cause complexity/musicality factor raise exponentialy.
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Old 3rd August 2011, 03:58 PM   #14
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This looks quite interesting and indeed, very simple. What's the power ? And could someone post a schematic for the power supply (for a beginner such as I ).
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Old 3rd August 2011, 04:09 PM   #15
MarianB is offline MarianB  Romania
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Quote:
Originally Posted by Dmeister View Post
This looks quite interesting and indeed, very simple. What's the power ? And could someone post a schematic for the power supply (for a beginner such as I ).
Well i presume the power would be something like 30 or 40W on a 4Ohm load, but that is just an asuption, if i'm wrong than i apologise and ask to be corrected.

As for the power supply, well it would have to be something like this:
Click the image to open in full size.

The filter caps should be arround 10.000u at the proper voltage rating, you could add 2 power resistor in paralel with the caps for discharge purpose, as well as 2 ceramic or poliester 100n capacitors in paralel as well with the big ones, to compensate for high frequencyes.
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Old 3rd August 2011, 04:33 PM   #16
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@Dmeister

If we asume that +/- 35 V rails potential is stable (maybe even regulated) than we could easily achieve 50 Wrms/8 ohm (3,53 Ap) or even 75 Wrms/4 ohm (6,12 Ap). I would also recommend to set high quiescent current, at least 200 mA through output mosfets.
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Old 3rd August 2011, 04:49 PM   #17
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Very nice Lazy Cat.............
Are you listening to a single channel, or do you have a stereo setup?

Thanks
Terry
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Old 3rd August 2011, 05:10 PM   #18
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Manage to put together one channel, both will be ready soon. Nevertheless mono listening test showed its serious potential to be a good sounding amp. Presented dynamics and vocal authentics just astonished me.
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Old 3rd August 2011, 06:00 PM   #19
Bigun is offline Bigun  Canada
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A nice project - DIY at it's best !

p.s. This design reminds me mostly of Hiraga's Le Monstre with a touch of F5 ?
Attached Images
File Type: png Hiraga-Monstre-Monster-Class-A-amplifier-schematic.png (31.2 KB, 3961 views)
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Last edited by Bigun; 3rd August 2011 at 06:09 PM.
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Old 4th August 2011, 12:43 AM   #20
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I see So nothing new on the planet Earth, just fun continous
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