Explendid amplifier designed by Michael Bittner, our MikeB - Page 378

quicknick · 08:34 PM

After a year-long break, here it is! Complete with remote-control-relay-based R2R attenuator and source selector, soft-start, speaker delay and DC&thermal protection, all encased in nice case!
It sounds as it should and all that's missing is a proper front panel instead of this one that I made from cardboard

... I have the thick, black Aluminum one that came with the case but I still need to find a place where to machine it properly.

Edit: I hope the image thumbnails do not appear so large as to require a horizontal scroll. If they do... it means I need help

destroyer X · 4th September 2010, 09:09 PM

If not, then please share with us.

If yes, then post the link please.

Congratulations, my dear friend Michael Bittner would be very happy watching what you have done....as i am one of the "survivers" from this thread, i would like to congratulate you.

regards,

Carlos

quicknick · 4th September 2010, 09:19 PM

Thanks Carlos!

The volume controller/source selector is "Project 3" from here:

Yet another Volume controlers and source selections

destroyer X · 4th September 2010, 09:27 PM

regards,

Carlos

maouna · 18th October 2010, 11:35 PM

i have read that the amp has some istability issues when used with 2sc5200-2sa1943. when i did a simulation i found that these do not give a very good phase and gain margin .a more appropriiate output would be mjl21193 mjl21194 and 10p feedback capacitor.what is your opinion about these because i already have built two channels but i dont know what output transistors to put.

-_nando-_ · 18th October 2010, 11:38 PM

Nice!

What is the display for?

Cheers!f

ptempel · 28th November 2010, 08:10 PM

I was thinking of using the PCB set from tubeshunter on ebay to build the symasym 5.3 amp:

symasym items - Get great deals on Electronics, goldmund items on eBay.com!

Has anyone tried these boards? Only difference I can see so far is the multi-turn pot for R22. For R27 and R28 (0.22 ohm 5 watt), do you recommend metal oxide or wire wound? This would be my first amp build so might be diving in the deep end. But all the positive reviews I have read about it so far has me wanting to give it a go.

Thanks,
Philippe

difool · 29th November 2010, 08:58 AM

To me this offer does not comply with the diy intention of Mike. The seller is making money of it and it's not a group by for the diy-community. So this is a legal right issue to me. ebay won't do anything, they are earning money from the sales.

keantoken · 29th November 2010, 09:13 AM

Maouna, if you search Symasym on google, you will find Pavel adjusted Symasym (with schematic) to use the devices you speak of. Any change of output devices should probably have a compensation adjustment.

- keantoken

Rudi_Ratlos · 29th November 2010, 10:52 AM

There is a beautiful PCB of the SYMASYM, being offered in a group-buy of the German AAA-forum.

The picture above shows one channel of my SYMASYM.

This group-buy is authorized by Michael Bittner.

If somebody likes to have this PCB: write me a PM please and I will ask the German "Group-buy Thread" owner for some PCBs.

Best regards - Rudi_Ratlos

4th September 2010, 08:28 PM	#3771
quicknick diyAudio Member Join Date: Jun 2008 Location: Romania	My SymAsym 5_3 After a year-long break, here it is! Complete with remote-control-relay-based R2R attenuator and source selector, soft-start, speaker delay and DC&thermal protection, all encased in nice case! It sounds as it should and all that's missing is a proper front panel instead of this one that I made from cardboard ... I have the thick, black Aluminum one that came with the case but I still need to find a place where to machine it properly. Edit: I hope the image thumbnails do not appear so large as to require a horizontal scroll. If they do... it means I need help Last edited by quicknick; 4th September 2010 at 08:34 PM.

4th September 2010, 09:09 PM	#3772
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Beautifull!.... can you share?....or better...have you shared this remote control? If not, then please share with us. If yes, then post the link please. Congratulations, my dear friend Michael Bittner would be very happy watching what you have done....as i am one of the "survivers" from this thread, i would like to congratulate you. regards, Carlos __________________ My Youtube channel; http://www.youtube.com/user/destroyersoueu?feature=mhee

4th September 2010, 09:27 PM	#3774
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Thank you very much...i am sure MikeB would be pleased watching this regards, Carlos __________________ My Youtube channel; http://www.youtube.com/user/destroyersoueu?feature=mhee

29th November 2010, 09:13 AM	#3779
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas Blog Entries: 1	Maouna, if you search Symasym on google, you will find Pavel adjusted Symasym (with schematic) to use the devices you speak of. Any change of output devices should probably have a compensation adjustment. - keantoken __________________ Contribute to the DIYAudio WIKI! http://www.diyaudio.com/forums/every...p-sign-up.html LTSpice wiki with special attention to new users' troubles

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4th September 2010, 09:19 PM	#3773
quicknick diyAudio Member Join Date: Jun 2008 Location: Romania	Thanks Carlos! The volume controller/source selector is "Project 3" from here: Yet another Volume controlers and source selections

18th October 2010, 11:35 PM	#3775
maouna diyAudio Member Join Date: Oct 2008	i have read that the amp has some istability issues when used with 2sc5200-2sa1943. when i did a simulation i found that these do not give a very good phase and gain margin .a more appropriiate output would be mjl21193 mjl21194 and 10p feedback capacitor.what is your opinion about these because i already have built two channels but i dont know what output transistors to put.

18th October 2010, 11:38 PM	#3776
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: São Paulo	Nice! What is the display for? Cheers!f

28th November 2010, 08:10 PM	#3777
ptempel diyAudio Member Join Date: Jul 2008	I was thinking of using the PCB set from tubeshunter on ebay to build the symasym 5.3 amp: symasym items - Get great deals on Electronics, goldmund items on eBay.com! Has anyone tried these boards? Only difference I can see so far is the multi-turn pot for R22. For R27 and R28 (0.22 ohm 5 watt), do you recommend metal oxide or wire wound? This would be my first amp build so might be diving in the deep end. But all the positive reviews I have read about it so far has me wanting to give it a go. Thanks, Philippe

29th November 2010, 08:58 AM	#3778
difool diyAudio Member Join Date: Sep 2002 Location: Germany Blog Entries: 1	To me this offer does not comply with the diy intention of Mike. The seller is making money of it and it's not a group by for the diy-community. So this is a legal right issue to me. ebay won't do anything, they are earning money from the sales.

29th November 2010, 10:52 AM	#3780
Rudi_Ratlos diyAudio Member Join Date: Jun 2009 Location: Hamburg / Germany	There is a beautiful PCB of the SYMASYM, being offered in a group-buy of the German AAA-forum. The picture above shows one channel of my SYMASYM. This group-buy is authorized by Michael Bittner. If somebody likes to have this PCB: write me a PM please and I will ask the German "Group-buy Thread" owner for some PCBs. Best regards - Rudi_Ratlos

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