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Old 12th November 2008, 07:11 AM   #901
big1 is offline big1  Australia
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Default Re: Re: Re: B1 born in the land of Oz

Quote:
Originally posted by rabbitz


I meant "did". You had me going there as I'm partially disabled and tend to hit the wrong keys or type slower than the brain so I miss out on key words.

When I adjusted the offsets to about the same numerically (1.4mV), even though one was +ve and the other -ve, the rails were quite different. I'm trying to remember but it was something like +10.1V and -9.4V so I decided to keep the rail voltages the same and have and extra 1.3mV offset which is no problem.

Salas

The next one I build I'll try and get them closer, but hey, a few mV here or there is not going to upset me.
Hi
I have the Anthony Holton NXV200 amp and would like to build B1,where do you get the parts in oz?
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Old 12th November 2008, 11:00 AM   #902
rabbitz is offline rabbitz  Australia
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big1

I bought mine from diyAudio member Kovax in Croatia. Took about 12 days to arrive and work a treat.

Matched pairs of 2SK170BL and 2SJ74BL and stuff...
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Old 12th November 2008, 11:35 AM   #903
flg is offline flg  United States
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Quote:
Originally posted by Gooch
...I have another question I have an old Dell laptop power supply output is 20v DC that should work? Or should I get something at 18v DC?...
Your Dell charger is likely a fairly well regulated 19.5-20V or so. There will be almost no loading on it as it is likely 3A-6A rated. I would position it a good fisical distance away from the B1 as it will emit switching noise your systen will pick up. Also filter it better with some film caps.
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Old 12th November 2008, 01:31 PM   #904
sonidos is offline sonidos  United States
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Quote:
Try explaining it to the new bald headed boss
udailey, how did you know?!?! We just walked through a discussion of our December scheduling, which will be hectic. I asked him where my time off comes into the schedule because he has me involved in just about every hot project.

Everyone: I'll have some photos up soon of my B1 build as it progresses. I've already got the main board populated with caps, resistors, relays, etc.

I spent last night on getting my bridge rectifiers and caps populated...coming together nicely. This weekend will probably be spent in the garage drilling holes in the chassis on my drill press.
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Old 12th November 2008, 01:40 PM   #905
Gooch is offline Gooch  United States
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Quote:
Originally posted by flg


Your Dell charger is likely a fairly well regulated 19.5-20V or so. There will be almost no loading on it as it is likely 3A-6A rated. I would position it a good fisical distance away from the B1 as it will emit switching noise your systen will pick up. Also filter it better with some film caps.

You most have one of those power supplies you pretty much nailed it. I order the parts I didn't have on hand now I have to come up with some type of chassis for it.

Thanks again for all the help
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Old 13th November 2008, 02:21 AM   #906
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My B1 is an ugly, Manhattan style version -- but does it perform quite nicely -- this is the THD% graph with only 18V -- when I run it at 32V the THD% averages about 0.00066%

Click the image to open in full size.
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Old 13th November 2008, 02:34 AM   #907
flg is offline flg  United States
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Quote:
Originally posted by Gooch
You most have one of those power supplies you pretty much nailed it...
Thanks again for all the help

I might have a few around here... I used to work in the off Line switcher bis. Used to build protos and demos. You can find some that are 8-10A. Save those for a power amp
Now I play with DC-DC stuff. 12V to 1.2V Not much use except for putor stuff
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Old 13th November 2008, 03:43 AM   #908
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You really don't want to use a switcher -- note that 1/2 VCC is injected onto the gate and any noise on the VCC node will degrade performance.
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Old 13th November 2008, 08:13 AM   #909
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Hi Everyone
I got my B1 buffer PCB with 4 matched JFETS today.
Has anyone else received theirs yet?
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Old 13th November 2008, 08:43 AM   #910
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by Gooch
Thanks Guy's for you help appreciate it.

I have another question I have an old Dell laptop power supply output is 20v DC that should work? Or should I get something at 18v DC?

Cheers
Dave
It can run on a voltage up to 24V.
What you really ought to want, is a shuntreg
Here and onwards

It simply sounds crisp, transparent and very enjoyable.

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