B1 Buffer Preamp

[troystg]

Adjustable pwr supply from PE:

http://www.parts-express.com/pe/sho...ravel+Adapter+012909&utm_campaign=email012909


Just got the email flyer..

 

[raypalmer]

Any idea on the eta for more of these boards?? Does anyone have any spares I can buy??!?

 

[udailey]

Go to Pass DIY dot com and check out the store. Yeah it says none available. Mine showed up yesterday so dont believe the words on the site. Email Colin and ask him. You might get really lucky.
Uriah

 

[Lee35210]

Pots for B1

I've got some Noble 50k log mono avail for cheap:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=137764

Bought 10 to get good price per pot, but don't need but 2

 

[Lee35210]

PassDIY Badge

Any body else wondered how great a PassDIY logo for the front panel would be? Or maybe a First Watt DIY logo?

Sure would be a nice finishing touch to an excellent project.

Please Papa?

 

[udailey]

I think it says on his site that if you want you can submit pics of your build to his site and he will send you a sticker Couldnt be easier.
Uriah

 

[Nelson Pass]

Re: PassDIY Badge

Any body else wondered how great a PassDIY logo for the front panel would be? Or maybe a First Watt DIY logo?

Sure would be a nice finishing touch to an excellent project.

Please Papa?

email a request to colin@passlabs.com

 

[sonidos]

DIY Badge

I want a PassDIY badge! Sorry honey, can't watch the kids tonight..gotta finish my B1 build!

 

[udailey]

Colin, Prepare your Inbox!

 

[Lee35210]

DIY Badge

Thanks, Papa!!!


PS Love my 8" El-Pipe-O's, or as I call them, the Baby Bongs

 

[warren64c]

Transporter

Could you use a pair of B1's to bypass the op-amp stage in a Slim Devices Transporter?


I would guess the sound woudl have to improve without opamps

 

[pchw]

Colin, Prepare your Inbox!

No kidding!!

 

[labjr]

Re: Transporter

Could you use a pair of B1's to bypass the op-amp stage in a Slim Devices Transporter?


I would guess the sound woudl have to improve without opamps

Probably depends on the circuit. Is it a unity gain buffer? I'd have to guess the opamps are SMD chips and the whole unit is most likely one board. Would you really want to tear it apart just to compare the sound?

 

[warren64c]

transporter

There is a raging debate about the quality of the 5534 opamps used in the transporter. People are offering very expensive upgrades which include replacing or bypassing the opamp stage. Others say the design is fine, just the way it is.

It wouldn't be too hard to pull the signal off before the outputs to run them through the B1 boards and then to the balanced outs.

It would stand to reason that the B1 would necessarily sound better than the opamps (there is plenty of gain coming off the dacs).

 

[rob lenk]

B-1

quick question
could you get more ISOLATED outputs from this design by just adding more "legs" downstream from the 10uf cap? I'm assuming multiple R104 & R105 dividers
anyone?
bueller?
tnx
rob

 

[Nelson Pass]

Any idea on the eta for more of these boards?? Does anyone have any spares I can buy??!?

We have about 20 in excess of orders as of today.

 

[raypalmer]

Boosh!!

Put one aside for me! I emailed Colin but he hasn't replied yet?

 

[labjr]

Re: transporter

There is a raging debate about the quality of the 5534 opamps used in the transporter. People are offering very expensive upgrades which include replacing or bypassing the opamp stage. Others say the design is fine, just the way it is.

It wouldn't be too hard to pull the signal off before the outputs to run them through the B1 boards and then to the balanced outs.

It would stand to reason that the B1 would necessarily sound better than the opamps (there is plenty of gain coming off the dacs).

I don't think the NE5534 is anything special. It's not one of those "high-end" opamps. I don't know why they would put 99 cent op-amps in a $2,000 unit, but i can guess. Then it gets a good review in Stereophile.

 

[jackinnj]

Re: Re: transporter

I don't think the NE5534 is anything special. It's not one of those "high-end" opamps. I don't know why they would put 99 cent op-amps in a $2,000 unit, but i can guess. Then it gets a good review in Stereophile.

Those NE5534/2 are darn good opamps. Perhaps not up to the standards of the new muscular crew from TI, National and ADi but you get an awful lot of performance for a great price.

 

[Salas]

The Benchmark DAC designer wrote me in an email that they chose them 5534s not on cost grounds, but because IMD wasn't rising with frequency in DAC1 as with costlier ones.