New-building of my B1 buffer

[Babowana]

Originally posted by steenoe

J-fet matching for B1

Hi, Steen

Thanks for the valuable info.

For example, as follows?

Upper Idss - Lower Idss
8.67mA - 8.5mA
8.68mA - 8.5mA

>><<

[steenoe]

That would be superb, even with perfect matching between the channels. I just got the itch to build one more B1, because of this little talk

[Babowana]

>><<

Okay, my new B1 is now working, wow . . . !!!

The attached picture shows the baby B1 and F5 working together.

Cheers,

[Vix]

Great!

[mightym]

Babowana,

Neat build, did you etch a board? Or, is this a P2P? I couldn't make it out from the picture.

I'd like to DIY my own version of the B-1, I'm trying to decide P2P/make a board.

Is it possible you would have more photos, and willingness to post them??

It would be much appreciated.

John

[twitchie]

Babo has a secret for making boards - actually magic more than a secret (magic markers)

Look at Babo's F5 building thread - he draws his boards by hand using oil-based paint markers.

[Babowana]

Here is a close-up view of my baby B1.

I made exactly the same PCB as shown in the post #1, but the size was adjusted to a bit smaller dimension, 170mmX120mm, fit for the box.

Two fat electrolytic caps are Korean made, Samhwa. One black film cap of 1uF is parallel with one of the two fat caps. Two black film caps of 10uF are output-coupling caps. Two yellow film caps of 1uF are input-coupling caps (Icel of 1% tolerance). I got these film caps from my old diy-projects

All resistors are Korean made, except Panasonic 1-ohm-2W resistor just behind the +19V inlet.

By the way, you might wonder with . . . You see?
The input and output RCA connections have (+) wires only. Where are the (ground) connections?


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[Zen Mod]

Originally posted by Babowana
..... Where are the (ground) connections?


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ya have backplate , grounding them all

[Babowana]

Originally posted by Zen Mod

ya have backplate , grounding them all

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Here is back side (or rear side) view . . . which English is correct . . . ?

The aluminium (or aluminum) back plate is a common ground for the all RCA connectors. And, the center of the plate having the same distance to each PCA connector is connected to the GND point of the PCB.

Seasons Greetings,

>><<

[eLarson]

Originally posted by Babowana


>><<

Here is back side (or rear side) view . . . which English is correct . . . ?

Either one is fine.

The aluminium (or aluminum) back plate is a common ground for the all RCA connectors. And, the center of the plate having the same distance to each PCA connector is connected to the GND point of the PCB.

Seasons Greetings,

Very attractive build, Babowana.