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Group Buy for the Through Hole Folded Cascode CEN IV boards

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#301
GB3 tentative list :

BRN 2 set boards, no mosfets
ZUM911 2 set boards, no mosfets
barryblue 2 sets boards, 2 sets mosfets
Johnny Canuck, 2 sets boards, no mosfets
BEYoung, 2 sets boards, ?? set mosfets
Hartbigsky, 1 set boards, ?? set mosfets
aljordan, 2 sets boards, 0 set mosfets
Intojazz 1 set boards, 1 set mosfets
floyd89gr 1 set boards, 1 set mosfets
Subbu K, 2 sets boards, no mosfets
manniraj 1 set boards, no mosfets
baswamin 1 set boards, 1 set mosfets
intojazz 1 set boards, 1 set mosfets
av-trouvaille, 1 set mosfets
luchoh 1 set boards, 1 set mosfets
 
#302
Thanks guys, another bit of tidying up

GB3 tentative list :

BRN 2 set boards, no mosfets
ZUM911 2 set boards, no mosfets
barryblue 2 sets boards, 2 sets mosfets
Johnny Canuck, 2 sets boards, no mosfets
BEYoung, 2 sets boards, ?? set mosfets
Hartbigsky, 1 set boards, ?? set mosfets
aljordan, 2 sets boards, 0 set mosfets
floyd89gr 1 set boards, 1 set mosfets
Subbu K, 2 sets boards, no mosfets
manniraj 1 set boards, no mosfets
baswamin 1 set boards, 1 set mosfets
intojazz 2 set boards, 2 set mosfets
av-trouvaille, 1 set mosfets
luchoh 1 set boards, 1 set mosfets
 
#303
BRN 2 set boards, no mosfets
ZUM911 2 set boards, no mosfets
barryblue 2 sets boards, 2 sets mosfets
Johnny Canuck, 2 sets boards, no mosfets
BEYoung, 2 sets boards, ?? set mosfets
hartbigsky, 1 set boards, YES 1 set mosfets
aljordan, 2 sets boards, 0 set mosfets
floyd89gr 1 set boards, 1 set mosfets
Subbu K, 2 sets boards, no mosfets
manniraj 1 set boards, no mosfets
baswamin 1 set boards, 1 set mosfets
intojazz 2 set boards, 2 set mosfets
av-trouvaille, 1 set mosfets
luchoh 1 set boards, 1 set mosfets

yes for hartbigsky
 
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#304
I counted 9 sets of MOSFETs, so we cannot go and buy 100 pieces of each type for matching.
It will mean a smaller pool to match from, and hence lower yield, which will jack up cost of matched sets.
Maybe by a factor of 2 if we order 50 pairs to get 9 sets.

Just to manage expectations.
If RickRay can supply you all with what he has on hand, maybe he should.
Fran has none left from the last batch, as far as I know.

Shall wait a couple of weeks before ordering MOSFETs, just on case.


Patrick
 
#309
sign me up for 1 and 1

BRN 2 set boards, no mosfets
ZUM911 2 set boards, no mosfets
barryblue 2 sets boards, 2 sets mosfets
Johnny Canuck, 2 sets boards, no mosfets
BEYoung, 2 sets boards, ?? set mosfets
hartbigsky, 1 set boards, YES 1 set mosfets
aljordan, 2 sets boards, 0 set mosfets
floyd89gr 1 set boards, 1 set mosfets
Subbu K, 2 sets boards, no mosfets
manniraj 1 set boards, no mosfets
baswamin 1 set boards, 1 set mosfets
intojazz 2 set boards, 2 set mosfets
av-trouvaille, 1 set mosfets
luchoh 1 set boards, 1 set mosfets
NORTH4, 1 set board, 1 set mosfets
 
#310
BRN 2 set boards, no mosfets
ZUM911 2 set boards, no mosfets
barryblue 2 sets boards, 2 sets mosfets
Johnny Canuck, 2 sets boards, no mosfets
BEYoung, 2 sets boards, ?? set mosfets
hartbigsky, 1 set boards, YES 1 set mosfets
aljordan, 2 sets boards, 0 set mosfets
floyd89gr 1 set boards, 1 set mosfets
Subbu K, 2 sets boards, no mosfets
manniraj 1 set boards, no mosfets
baswamin 1 set boards, 1 set mosfets
intojazz 2 set boards, 2 set mosfets
av-trouvaille, 1 set mosfets
luchoh 1 set boards, 1 set mosfets
NORTH4, 1 set board, 1 set mosfets
leejh, 2 sets boards, no mosfets
 
#311
[2SK170BL and 2SJ74BL which are available from the diyaudio store. For each channel you will need 2 matched 2SK170 and one matched pair of 2SK170/2SJ74 (for example, one N-channel quad and one NP-quad from the store for a stereo pair @$80-90 plus shipping)]

Are these parts the ones in question? 6-11ma are listed as available. I have a few I would need to match I think I purchased as matched pairs for building basic CEN/SEN I/V which I think this product developed from. I buy a few every now and then to have on hand as I have several Pass components that use them.
How closely do they need to be matched?

regards,
Steve
 
#313
Any mismatch between NJFET and PJFET at the input will result in input DC offset as seen by the DAC i_out.
This cannot be trimmed.

Any mismatch between the two NJFETs at the output will result in output DC offset.
This can be trimmed together with the rest of the circuit, as a whole.


Patrick
 
#315
Its been a while since I posted and I wanted to give a short update on where we are at with GB3.

I am waiting on board supplier to get back up running after new year celebrations. We have mosfets and R1-R4 sorted for all who have expressed interest. So in about 2-3 weeks I would think paypal invoices will go out, and shipping pretty quickly after that.

Its taken a bit of time to get this up and running, but we are getting closer now....
 
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#317
BRN 2 set boards, no mosfets
ZUM911 2 set boards, no mosfets
barryblue 2 sets boards, 2 sets mosfets
Johnny Canuck, 2 sets boards, no mosfets
BEYoung, 2 sets boards, [mosfets not needed assuming one set RickRay mosfets maps to one set of PCBs]
hartbigsky, 1 set boards, YES 1 set mosfets
aljordan, 2 sets boards, 0 set mosfets
floyd89gr 1 set boards, 1 set mosfets
Subbu K, 2 sets boards, no mosfets
manniraj 1 set boards, no mosfets
baswamin 1 set boards, 1 set mosfets
intojazz 2 set boards, 2 set mosfets
av-trouvaille, 1 set mosfets
luchoh 1 set boards, 1 set mosfets
NORTH4, 1 set board, 1 set mosfets
leejh, 2 sets boards, no mosfets
 
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