Mezmerize DCB1 Building Thread - Page 42

Salas · 19th November 2011, 06:51 PM

Use 9mA quad for the signal section if you got. Less THD than using 6mA.

Marinos · 20th November 2011, 07:00 AM

Thanks Salas,
What about the others ?
If you had a choice, what would you chose ?

momomo67890 · 20th November 2011, 09:03 AM

i get .5/2.5mv dc does that seem wrong i read under 5mv is ok, .5 seems off the matched quad i bought are 9.15/9.15/9.15/9.13 ? and 10.2/10.7v for power supply anything else to test ?

AndrewT · 20th November 2011, 09:42 AM

Are both your output offset voltages a negative value? i.e. did you measure +0.5mVdc or -0.5mVdc? Similarly did you measure +2.5mVdc or -2.5mVdc for the other channel?

momomo67890 · 20th November 2011, 06:25 PM

+10.9mVdc, -10.2mVdc -.5mVdc, -2.5mVdc

AndrewT · 20th November 2011, 06:29 PM

Quote:

Originally Posted by momomo67890

-.5mVdc, -2.5mVdc

good. That tells you that the two jFETs in each pair are the correct way around. The CCS jFET should be the lower Idss. This results in a slight -ve offset.

delecoy · 9th December 2011, 01:53 AM

Would an Antek AS-1215 ( 2x15V, 100VA, 3.3A ) be acceptable for the Mezmerize? Going over the threads I've seen recommendations for anywhere from 12-15V, 30-100VA. I already have one, and was under the impression that only its size would be an issue. Its a bit chunky. This will be my first DIY build so just beginning to learn, needless to say.

Salas · 9th December 2011, 02:39 AM

Acceptable. Can do no harm. Its just bad economy.

momomo67890 · 9th December 2011, 02:48 AM

Quote:

Originally Posted by delecoy

Would an Antek AS-1215 ( 2x15V, 100VA, 3.3A ) be acceptable for the Mezmerize? Going over the threads I've seen recommendations for anywhere from 12-15V, 30-100VA. I already have one, and was under the impression that only its size would be an issue. Its a bit chunky. This will be my first DIY build so just beginning to learn, needless to say.

i used one that i had for a different project worked out fine.

delecoy · 9th December 2011, 03:15 AM

Thank you much!

20th November 2011, 07:00 AM	#412
Marinos diyAudio Member Join Date: Mar 2003 Location: Athens	Thanks Salas, What about the others ? If you had a choice, what would you chose ? __________________ Marinos

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19th November 2011, 06:51 PM	#411
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Use 9mA quad for the signal section if you got. Less THD than using 6mA.

20th November 2011, 09:03 AM	#413
momomo67890 diyAudio Member Join Date: May 2010	i get .5/2.5mv dc does that seem wrong i read under 5mv is ok, .5 seems off the matched quad i bought are 9.15/9.15/9.15/9.13 ? and 10.2/10.7v for power supply anything else to test ?

20th November 2011, 09:42 AM	#414
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Are both your output offset voltages a negative value? i.e. did you measure +0.5mVdc or -0.5mVdc? Similarly did you measure +2.5mVdc or -2.5mVdc for the other channel?

20th November 2011, 06:25 PM	#415
momomo67890 diyAudio Member Join Date: May 2010	+10.9mVdc, -10.2mVdc -.5mVdc, -2.5mVdc

9th December 2011, 01:53 AM	#417
delecoy diyAudio Member Join Date: Nov 2011 Location: Austin, TX	Would an Antek AS-1215 ( 2x15V, 100VA, 3.3A ) be acceptable for the Mezmerize? Going over the threads I've seen recommendations for anywhere from 12-15V, 30-100VA. I already have one, and was under the impression that only its size would be an issue. Its a bit chunky. This will be my first DIY build so just beginning to learn, needless to say.

9th December 2011, 02:39 AM	#418
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Acceptable. Can do no harm. Its just bad economy.

9th December 2011, 03:15 AM	#420
delecoy diyAudio Member Join Date: Nov 2011 Location: Austin, TX	Thank you much!