Burning Amp BA-3 - Page 85 - diyAudio
 Burning Amp BA-3
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diyAudio Member

Join Date: Apr 2002
Location: SE Washington State
Quote:
 Originally Posted by nkdk Hi Thx for the answers I have swap p1-p2 too 1kΩ and the volts over R10-11 is 1,0 volts now, then this okay , there is running 45 ma , but how about Q1-2 there is only running 4 ma,is that a problem ?? 600 Ω drain resistor? , there is no 600 Ω resistor only 10 Ω with a 100 Ω pot Nkdk
The 4 ma is why you had to increase the drain resistance. I think the Idss was specified to be 10 ma. Problem, I don't know? Have a listen and see what you think.

The 600 ohm was the combined total drain resistance, but that doesn't matter now that you have put in the new pot.

 21st July 2012, 04:11 AM #842 diyAudio Member   Join Date: May 2009 Hi Okay thx, i give it a try and make some listen tests, and ma by fiddle with q1-2 Nkdk
 2nd September 2012, 06:39 PM #843 diyAudio Member   Join Date: Nov 2011 Measurements Hi there, i was hoping that someone could point me in the right direction regaring some measurements on the front end. I have a dip/overshoot on the negative curve that i would like to understand. Voltage on the resistors are: Left R3/R4 = 64.66 - 64.69mV R10 = 1.042 V R11 = 1.037 V Right R3/R4 = 65.08 - 65.10mV R10 = 1.038 R11 = 1.036 Here are som waveforms from the scope, the blue ones are for left channel and red for right. The input is 2Vp-p @ 5k, 50k and 100kHz. Measured across R13. 2Vpp_5Khz_Left.gif2Vpp_5Khz_Right.gif 2Vpp_50kHz_left.gif2Vpp_50kHz_Right.gif 2Vpp_100Khz_Left.gif2Vpp_100Khz_Right.gif
 2nd September 2012, 07:27 PM #844 diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain fiddle with P3 __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
diyAudio Member

Join Date: May 2010
Location: Texas
Hi
Would some one help me out here I don't know where to connect the connection from the ba 3 to the bias board ,Like what connects to D+ or D- or S
Thanks
NS
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diyAudio Moderator R.I.P.

Join Date: Nov 2005
Quote:
 Originally Posted by noSmoking ......Like what connects to D+ or D- or S Thanks NS
according to new BA3 frontend schematic, +D is signal out(to power amp)
I reckon -D would be signal ground

S ...? I only find that on old BA1 frontend, so I guess it goes nowhere now with new BA1/BA3 ?

 7th September 2012, 08:28 PM #847 diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain who made these pcbs ? __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 7th September 2012, 10:01 PM #848 diyAudio Member     Join Date: Jul 2009 Location: Near Frankfurt Diyaudio store Output of One side of the BA-3 frontend to D (GS) and ground G of One bias board, the same with the other output of the BA-3 Frontend and the other bias board. D+ and D- are Only for the bias and S is the feedback sensing the bias current. __________________ and the First Wtt is......a really First Class PSS Idea Last edited by generg; 7th September 2012 at 10:13 PM.
 7th September 2012, 10:06 PM #849 diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain so there must be a blog somewhere ? D+ and D- are reminding me on BA3 balanced sorry - I just didn't follow birth of pcbs __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 7th September 2012, 10:20 PM #850 diyAudio Member     Join Date: Jul 2009 Location: Near Frankfurt Unfortunately Nelson's PDF and the bias and output board nomenclature are a bit different I always had to think twice when connecting these parts and often.......did it the wrong way. In this case D+and D- refer to the drains of the upper and lower outputstage and their bias. D (GS) !GS means gainstage, is the real input and the ground point nearby is for he shielded cable. __________________ and the First Wtt is......a really First Class PSS Idea

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