The B1 Buffer and F5 Build intergrated, questions - diyAudio
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Old 15th March 2013, 08:04 PM   #1
Rixsta is offline Rixsta  United Kingdom
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Default The B1 Buffer and F5 Build intergrated, questions

Hey, Iv'e already built an F5 thats been working a year, can someone please help with this, call me silly but i cant find the info about this pre i have couple of questions

Whats the B1 actually do ? if its not a pre-amp does it not amplify the sound ?
Whats the benefit of using it with the F5 ?
Does the B1 buffer take care of a little DC offset ?


This F5 here, can anyone guess what the two red boxes are ? and what transformer that might be ?
and one more... that black cable on the power switch whats the name for that ?
Inspiration.jpg

The wire used here, what kind of wire would this be ? or where to buy ? lol
anyone know a source of clips that can hold down the Mosfets, i like that!

F5__PCB_Close.jpg

Im going to build the pre or B1, into the same chassis as the F5, along with inputs, selector switch etc
cheers for looking
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Last edited by Rixsta; 15th March 2013 at 08:13 PM.
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Old 15th March 2013, 08:29 PM   #2
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I just built an integrated, check out my thread at F5 / Mezmerize Integrated.

The B1 just provides for volume control and source switching, but it does it transparently. Check out Nelson Pass's article on Passdiy.com.
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Old 15th March 2013, 09:34 PM   #3
Rixsta is offline Rixsta  United Kingdom
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Thankyou, think im realy up for B1 or DCB1, I realy like the idea of no caps in the signal path! will check the original article lol

the first F5 i built i sourced the PCB's from ebay, now i regret that but they seem to have 2 caps on
2.jpg
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Old 15th March 2013, 09:47 PM   #4
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Quote:
Originally Posted by Rixsta View Post
Whats the B1 actually do ? if its not a pre-amp does it not amplify the sound ?
Nope. It's a buffer. It lets the volume pot (attenuator) operate in an ideal environment and allows for the driving of long cables if you need to.



Quote:
Whats the benefit of using it with the F5 ?
Volume control.

Quote:
Does the B1 buffer take care of a little DC offset ?
Yes. It's cap coupled.
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Old 15th March 2013, 10:28 PM   #5
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Quote:
Originally Posted by Rixsta View Post
Whats the B1 actually do ?
This will explain - http://passdiy.com/pdf/B1%20Buffer%20Preamp.pdf
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Old 15th March 2013, 11:09 PM   #6
Rixsta is offline Rixsta  United Kingdom
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Thanks, almost totaly cleared up my concerns now
apart from, when you mention long cables you mean from source to B1 or B1 to F5.
and last question, it would be better using a separate small transformer for the Pre than running it from the F5 PSU ?
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Old 15th March 2013, 11:41 PM   #7
6L6 is offline 6L6  United States
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B1 to amplifier.

You could run it from the F5psu, but you will need a regulator or the like to get the required voltage. A small transformer is easy. Or just have a small plug on the back for a wall-wart.
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Old 16th March 2013, 12:54 AM   #8
Rixsta is offline Rixsta  United Kingdom
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Thankyou for your help, the rest is easy now, time to have some fun
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Old 16th March 2013, 01:13 AM   #9
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Originally Posted by Rixsta View Post
Thankyou for your help, the rest is easy now, time to have some fun
Fun for sure... Glad you got your questions and concerns handled. I love the B1 and have one integrated with the "Amp Camp" amps and am using a DCB1 in front of my Nakamichi PA-7.
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Old 16th March 2013, 01:35 AM   #10
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Fun for sure... Glad you got your questions and concerns handled. I love the B1 and have one integrated with the "Amp Camp" amps and am using a DCB1 in front of my Nakamichi PA-7.
Just need some of those JBL monkey coffins like the dude in Clinton had with his PA-7s. Good setup to fill a room in a factory or a raging kegger.
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