Building a symmetrical psu B1 buffer - Page 28

Tea-Bag · 8th October 2009, 11:06 PM

I am happy to report that replacing the lower NPN with a Salas recommended BC517G and a upper 550c worked well.
This in addition to replacing the National Semi with STMicroelectronics 7812ACV removed the chatter I had currently seen. So I will ask Korben69 to put this on the recommended parts list.
I will also discuss with La Ode a possibility of updating the boards to reflect this change if we deem it will work for everyone.

billyk · 8th October 2009, 11:26 PM

That's good news for sure!

udailey · 9th October 2009, 12:37 AM

At the audio get together I had in Austin I think the Lightspeed was on the end of the preamp/buffer/RIAA thing. This sounded fantastic. I think people are putting the Lightspeed ahead of the B1. What do you think?
I was thinking my CDP is probably 600R out, a guess and if the B1 puts out 1kR then probably Lightspeed in front of B1. I am guessing in front.
Ri

Salas · 9th October 2009, 12:42 AM

The DCB1 specifically puts out 260R. The regular B1 about 1050R.

AndrewT · 9th October 2009, 10:50 AM

write about source impedance seen by the load or output impedance.
But "outputs 260R" and "puts out 1kR" is nonsensical.

Salas · 9th October 2009, 10:54 AM

Come on! Like nobody sees its DIY jargon.

korben69 · 9th October 2009, 04:28 PM

Hi all, great work !

I'm compiling the V3.7 including those mods :

- Lower NPN BC517G towards B1 audio part : Qty ? (Tea-Bag / Salas)
- Upper NPN BC550C towards the 2 resistors: Qty ? (Tea-Bag / Salas)
- STMicroelectronics 7812ACV : tested and approved (Tea-Bag)
- 538 10112033 Female 3 poles connector (Tea-Bag)
- 2x12v vs 2x15v 50VA (Tea-Bag)

Let me know if I'm missing something.
Quite busy until now

Salas · 9th October 2009, 04:34 PM

Quote:

Originally Posted by korben69

Hi all, great work !

I'm compiling the V3.7 including those mods :

- Lower NPN BC517G towards B1 audio part : Qty ? (Tea-Bag / Salas)
- Upper NPN BC550C towards the 2 resistors: Qty ? (Tea-Bag / Salas)

Let me know if I'm missing something.
Quite busy until now

Vice versa. Lower towards 2 resistors = BC517
Upper towards B1 audio part = BC550

danny_66 · 9th October 2009, 04:36 PM

For my B1 I'll try those new Takman resistors.
Until now I've been using Dale CMF/RN and nude bulk foil resistors, lots of Dale and only a few nude bulk foils, it has something to do with the price:-)

Now those Takmans come in two flavors: metal film and carbon.
Has someone compared them? Any differences ?
If I want the last bit of detail/transparency should I go with metal film instead of carbon? Or just buy them both and see/hear them for myself :-)

Regards,
Danny

korben69 · 9th October 2009, 04:36 PM

Quote:

Originally Posted by Salas

Vice versa. Lower towards 2 resistors = BC517
Upper towards B1 audio part = BC550

Lower towards 2 resistors = BC517
Upper towards B1 audio part = BC550
Ok corrected, what about the qty of ea ?
Thanks Salas

8th October 2009, 11:06 PM	#271
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 5	I am happy to report that replacing the lower NPN with a Salas recommended BC517G and a upper 550c worked well. This in addition to replacing the National Semi with STMicroelectronics 7812ACV removed the chatter I had currently seen. So I will ask Korben69 to put this on the recommended parts list. I will also discuss with La Ode a possibility of updating the boards to reflect this change if we deem it will work for everyone. __________________ DCB1/BiB Sign up Sheet Round #2 2012 CLICK HERE\|SSHV2 Shipping\| F5TConvertible Circuit Board Sign Up Sheet (Shipping)CLICK HERE\|Semisouth R100A/R085 available PM

9th October 2009, 12:37 AM	#273
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	At the audio get together I had in Austin I think the Lightspeed was on the end of the preamp/buffer/RIAA thing. This sounded fantastic. I think people are putting the Lightspeed ahead of the B1. What do you think? I was thinking my CDP is probably 600R out, a guess and if the B1 puts out 1kR then probably Lightspeed in front of B1. I am guessing in front. Ri __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

9th October 2009, 10:50 AM	#275
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	write about source impedance seen by the load or output impedance. But "outputs 260R" and "puts out 1kR" is nonsensical. __________________ regards Andrew T.

9th October 2009, 04:28 PM	#277
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	BOM news and Updates Hi all, great work ! I'm compiling the V3.7 including those mods : - Lower NPN BC517G towards B1 audio part : Qty ? (Tea-Bag / Salas) - Upper NPN BC550C towards the 2 resistors: Qty ? (Tea-Bag / Salas) - STMicroelectronics 7812ACV : tested and approved (Tea-Bag) - 538 10112033 Female 3 poles connector (Tea-Bag) - 2x12v vs 2x15v 50VA (Tea-Bag) Let me know if I'm missing something. Quite busy until now

9th October 2009, 04:36 PM	#279
danny_66 diyAudio Member Join Date: Jun 2005 Location: Lierde	Takman For my B1 I'll try those new Takman resistors. Until now I've been using Dale CMF/RN and nude bulk foil resistors, lots of Dale and only a few nude bulk foils, it has something to do with the price:-) Now those Takmans come in two flavors: metal film and carbon. Has someone compared them? Any differences ? If I want the last bit of detail/transparency should I go with metal film instead of carbon? Or just buy them both and see/hear them for myself :-) Regards, Danny


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8th October 2009, 11:26 PM	#272
billyk diyAudio Member Join Date: Oct 2005 Location: North Central Mass, USA	That's good news for sure!

9th October 2009, 12:42 AM	#274
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The DCB1 specifically puts out 260R. The regular B1 about 1050R.

9th October 2009, 10:54 AM	#276
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Come on! Like nobody sees its DIY jargon.

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