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My MOSFET amplifier designed for music.
My MOSFET amplifier designed for music.
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Old 24th May 2019, 03:07 PM   #891
bandol83 is online now bandol83  France
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Join Date: Nov 2004
Location: near Bandol, French Riviera
Hi,

My MOSFET amplifier made for music designed by Mooly is at Philippe home for the final integration in the enclosure, he is living not very far from me, also in the south of France, close to the little town of Bandol well known for the wine produced here I am lucky that Philippe is very smart in mechanical job because I am very bad for that Before I meet him (thanks to Internet Audio forums...) I had plenty of electronic boards assembled and working but not packaged !

Finally Philippe who has also made the final integration for my Quasi will keep the two small CRC power supply modules for his own Quasi project, therefor I had the opportunity to redesign a slightly larger CRC board for the Mooly amplifier since it use a bigger enclosure (see previous post). The new board will have the same height than the Mooly amplifier board designed by Prasi and will fit nicely close to it on the heatsink. With the bigger PCB I was able to put 30 mm diameter capacitor instead of 25 mm, it is possible to use 10'000 uF 50 V or 6'800 uF 63 V (what I am using now) which should be enough for most amplifiers...

Since the Mooly amplifier is no more here, I tested the power supply with an other small amplifier that I have designed to use some LM4702 (now obsolete) and Sanken STD03 that I had in stock. I have designed a first version 10 years ago but I made several mistakes and the ground was not well routed and I had some noise

This version is much better, I have no noise at all and the sound is very good, may be not as transparent and clear as the Quasi or the Mooly but it is a very simple and very compact amplifier to build (it is a stereo board !). If someone is interested and have some LM4702 in stock, it is possible to get the board from PCBWay because I share the design : LM4702 sanken amplifier - Share Project - PCBWay

When the Mooly amplifier will be finished, I will put the photos here For information I have just ordered 12 Renesas 2SJ162 and 12 2SK1058 from Reichelt because these Lateral MOSFET are still available from them

Cheers,
Marc
Attached Images
File Type: png PCB CRC Power Supply MK2.png (86.7 KB, 576 views)
File Type: jpg LM4702 MK2 ampli test 1.JPG (251.2 KB, 559 views)
File Type: jpg LM4702 MK2 ampli test 3.JPG (358.6 KB, 538 views)
File Type: jpg LM4702 MK2 ampli test 2.JPG (292.1 KB, 520 views)
File Type: jpg Photo LM4702 a.JPG (462.8 KB, 523 views)
File Type: jpg Ampli LM4702.JPG (422.5 KB, 255 views)
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Old 25th May 2019, 12:57 AM   #892
Vrystaat is offline Vrystaat  South Africa
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Well done !!
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Jan
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Old 25th May 2019, 10:37 AM   #893
AKSA is offline AKSA  Australia
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Hats off, Marc!

Hugh
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Old 2nd June 2019, 03:34 PM   #894
AMPMAN is offline AMPMAN
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Default mooly amp

Hi mooly can you please show me how to conert your amp to balanced input regards ampman
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Old 2nd June 2019, 07:45 PM   #895
Mooly is offline Mooly  United Kingdom
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My MOSFET amplifier designed for music.
Its not suitable for balanced operation I'm afraid as that really only applies to differential input stages that have similar characteristics between the inverting and non inverting inputs.

The emitter of the input transistor is the inverting input, however the single ended nature of the input stage means its not suitable to be used in a balanced configuration, not least because the DC conditions are always different between the two inputs.
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Old 12th June 2019, 02:37 PM   #896
UltimateX86 is offline UltimateX86  France
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My MOSFET amplifier designed for music.
HI,

Do you know the Q5 dissipation on idle and max output voltage ?

(edit) i found the asc : 268mW idle and 436mW pic with 28V output

it is not to high for a TO92 ?

thanks
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Last edited by UltimateX86; 12th June 2019 at 02:48 PM.
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Old 12th June 2019, 05:44 PM   #897
Mooly is offline Mooly  United Kingdom
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My MOSFET amplifier designed for music.
The dissipation is well within limits. This shows the 2N5551 data of power dissipation vs ambient temperature.
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Old 13th June 2019, 07:51 AM   #898
UltimateX86 is offline UltimateX86  France
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My MOSFET amplifier designed for music.
Thank you mooly,

in fact if I asked the question is because I would also used TO92 in VAS (BC560) and forumers warned me about the risk of reliability because of them while I had 200mW in idle and 280mW maximum

if you have no problem, I should not have any
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Last edited by UltimateX86; 13th June 2019 at 08:02 AM.
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Old 11th July 2019, 08:23 PM   #899
brian92fs is offline brian92fs  United States
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My MOSFET amplifier designed for music.
Quote:
Originally Posted by nfsgame View Post
Is there any possibility of getting the gerber files for this version with four outputs? Just for home-use of course!
Are Prasi's gerber files for the slimmer width PCB posted somewhere? I couldn't find them in the thread.
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