Group Buy for the Through Hole Folded Cascode CEN IV boards

[PJN]

Hi Fran,

Got my boards today, nice package. Took much longer to have it delivered once it got to US than it did to get from Ireland to US.

Paul

 

[1543]

@Patrick
Now I understand it, should have read all related documents, thanks

 

[woodturner-fran]

@1543 - well spotted- this is now corrected and new copies will have that correct.

Great to see all packs arriving safely....

 

[EUVL]

hirscwi - 1
Kokanee - 3
samoloko - 2
cristianr - 1
tistvan2 -1
madeleeuw - 2
Paddygarcia - 1
av-trouvaille - 1 or 2
RickRay - 1
manniraj - 1
obh - 1
odessamarin - 1
DtotheG - 1
darrr - 1
tadek -2
ihear21khz (David) - 1
asanden - 1
swak -2

Reserved by XEN Team - 8

Running total 32 sets.
Only 6 sets left for batch 2.


Patrick

 

[samoloko]

Would you please confirm count of pcbs
first post says set of 4 pcb for 2 single ended channels
why we need 4 pcbs for stereo

 

[EUVL]

Clearly described in post #1.

 

[tistvan2]

Would you please confirm count of pcbs
first post says set of 4 pcb for 2 single ended channels
why we need 4 pcbs for stereo

Sallen & Key filter pcb.

tistvan2

 

[EUVL]

Someone asked about bipolar transistor matching.

Most modern DMMs can be used to measure hfe.
Ideally it should be NNPP match.
But production batches vary, that you may not get N to P match even with hundreds.
So next best is NN-PP match, with as little N-P difference as possible.


Patrick

 

[hans030390]

I received my set several days ago safe and sound, by the way. I am very impressed with not only the included documentation but also the level of communication and assistance to the community from @EUVL and @woodturner-fran. Thank you!

 

[G600]

Boards received, thank you for the design and the effort to diffuse it!

 

[jimk04]

I have procured 37 N channel and 10 P channel MOSFETs. I shall attempt to match them and offer any suitable spares here.

 

[codyt]

Sounding great!

 

[Vunce]

Awesome Cody!!
Used with MiroDac?

 

[codyt]

Yep, using AD1862 Miro Dac right now, though will be trying PCM63 as soon as the chips arrive 🙂

 

[EUVL]

Lightning speed.

Maybe you can share some experience with the others with your DC trimming.
What DC you had as built, and what additional resistor you used to reduce it to near zero.

BTW, did I see any thermal grease between the FETs under the heat shrinks ?
Or you are using one of these black thermal adhesives ?


Patrick

 

[woodturner-fran]

Wow! First out of the blocks @codyt !

Well done, lovely neat build. Same questions as @EUVL and tell us about your power supply as well.

 

[nopants]

Is the GB over? I skimmed the thread and it seems like names are being taken for a rerun but I wasn't sure.

 

[woodturner-fran]

@nopants we are planning a second run, if you skim back a few posts you'll see the list for the second run - copy that and add your name to it and we will contact you soon.

 

[nopants]

hirscwi - 1
Kokanee - 3
samoloko - 2
cristianr - 1
tistvan2 -1
madeleeuw - 2
Paddygarcia - 1
av-trouvaille - 1 or 2
RickRay - 1
manniraj - 1
obh - 1
odessamarin - 1
DtotheG - 1
darrr - 1
tadek -2
ihear21khz (David) - 1
asanden - 1
swak -2
nopants - 2

Reserved by XEN Team - 8

 

[PJN]

Great job Cody, I won't be attempting my build till the holidays, but would surely appreciate any pointers you can give the rest of us.