e-Amp

Bonsai · 15th January 2012, 11:31 AM

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.

Bonsai · 15th January 2012, 11:58 AM

BTW, compensation is selectable using jumpers for either standard MC, TMC, or a hybrid comp scheme I've called WB-TMC.

wahab · 15th January 2012, 12:11 PM

Looks neat....

Apparently , a symetrical differential design.....That s great if true.

Those are very rare.

Bonsai · 15th January 2012, 12:13 PM

Thanks Wahab!

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

:-)

Nico Ras · 15th January 2012, 05:20 PM

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.

Bonsai · 16th January 2012, 04:28 AM

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.

Walkalone · 11th May 2012, 07:23 AM

@Bonsai: Look very good! I'm very interested.
Can you show the schematic and spec? (THD, Slew rate, BW... ect...?)

Tekko · 11th May 2012, 08:14 AM

That look just too professional to be homemade!!

You sure u arent rebuilding a commercial amp ?

Bonsai · 11th May 2012, 11:10 AM

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!

Bonsai · 11th May 2012, 11:12 AM

Walk lone, yes, when I have finished the listening tests in. Few weeks I will publish something.

15th January 2012, 11:58 AM	#2
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	BTW, compensation is selectable using jumpers for either standard MC, TMC, or a hybrid comp scheme I've called WB-TMC. __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

15th January 2012, 12:13 PM	#4
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Thanks Wahab! Yes, symmetrical differential design and EF3 - my preferred topology! :-) __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

16th January 2012, 04:28 AM	#6
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	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. __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

11th May 2012, 08:14 AM	#8
Tekko diyAudio Member Join Date: Jan 2005	That look just too professional to be homemade!! You sure u arent rebuilding a commercial amp ? __________________ The point of life is to build atleast one audio amplifier before you die.

11th May 2012, 11:10 AM	#9
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	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! __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/


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15th January 2012, 12:11 PM	#3
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	Looks neat.... Apparently , a symetrical differential design.....That s great if true. Those are very rare.

11th May 2012, 07:23 AM	#7
Walkalone diyAudio Member Join Date: May 2011 Location: Ho Chi Minh city	@Bonsai: Look very good! I'm very interested. Can you show the schematic and spec? (THD, Slew rate, BW... ect...?)

11th May 2012, 11:12 AM	#10
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Walk lone, yes, when I have finished the listening tests in. Few weeks I will publish something. __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

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