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Old 15th January 2012, 11:31 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default e-Amp

My new power amp ('e-Amp') is coming along quite well. The main boards power amp boards have been assembled and the protection and in-rush board has had the s/ware written and debugged. Still a lot of work to do, but it will probably be up and running in about 3 weeks. I'll post circuits, more pictures and a full write-up once testing is complete. There is a very small write up on my website below in the interim.

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Old 15th January 2012, 11:58 AM   #2
Bonsai is offline Bonsai  Taiwan
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BTW, compensation is selectable using jumpers for either standard MC, TMC, or a hybrid comp scheme I've called WB-TMC.
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Old 15th January 2012, 12:11 PM   #3
wahab is offline wahab  Algeria
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Looks neat....

Apparently , a symetrical differential design.....That s great if true.
Those are very rare.
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Old 15th January 2012, 12:13 PM   #4
Bonsai is offline Bonsai  Taiwan
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Thanks Wahab!

Yes, symmetrical differential design and EF3 - my preferred topology!

:-)
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Old 15th January 2012, 05:20 PM   #5
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We do share some layout ideas Bonzai, this is ELD prototyped Oct 2010. Also dual symmetrical and uses 2SK1058/2SJ162 driving 3 pairs of MJL3821A/1302A.

Front end runs off a voltage doubler and shunt regulated to 70V while the main amp runs from 48V.
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Old 16th January 2012, 04:28 AM   #6
Bonsai is offline Bonsai  Taiwan
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Very nice Nico - yes, I like this layout as well - great for spreading the heat and clamping the devices to the h/sink.

This e-Amp is running off +-73V (actually a bit on th high side, but it can live with it) and I am using a ripple eater on the pos and neg supplies to the front end.

I have a 50 odd page write -up I'll stick up on my site once the nit is assembled and tested - still need a few more weeks though.
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Old 11th May 2012, 07:23 AM   #7
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@Bonsai: Look very good! I'm very interested.
Can you show the schematic and spec? (THD, Slew rate, BW... ect...?)
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Old 11th May 2012, 08:14 AM   #8
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That look just too professional to be homemade!!

You sure u arent rebuilding a commercial amp ?
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Old 11th May 2012, 11:10 AM   #9
Bonsai is offline Bonsai  Taiwan
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Ha ha. Lol

No, the boards are made by a PCB house, but everything else is home made. I even file th holes in h chassis. This week end maybe it is wired up completely!
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Old 11th May 2012, 11:12 AM   #10
Bonsai is offline Bonsai  Taiwan
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Walk lone, yes, when I have finished the listening tests in. Few weeks I will publish something.
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