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PeeCeeBee V4H GB

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L

Lutto

Member
Joined 2008
rajesh - 2 PCBs
vgeorge - 2 PCBs
gwrskien - 4 PCBs + 1 set of MOSFETs
bambadoo - 4 PCBs
medisinmannen - 2 PCBs + 1 set of MOSFETs
jacques antoine - 2 PCBs
Asuslover - 2 PCBs
vasillis - 4 PCBs
fencki - 2 PCBs
meanman1964 - 2 PCBs
muthumuthiah - 2 PCBs (stereo kit)
craydive - 2 PCBs + 1 set of MOSFETs
ckwong99 - 2 PCBs + 1 set of MOSFETs
jls001 - 2 PCBs (stereo kit)
tome - 2 PCBs
mexakin - 2PCBs
pieter t - 2 PCBs
reaper996 -2 PCBs + 1 set of MOSFETs
883bkong -2 PCBs
emynet - 2 PCBs + 1 set of MOSFETs
patriz - 2 PCBs
CitizenKane - 6 PCBs
Lutto - 4 PCBs
 
vgeorge

vgeorge

Member
Joined 2004
goldenview.gr
rajesh - 2 PCBs
vgeorge - 2 PCBs + 1 set of MOSFETs
gwrskien - 4 PCBs + 1 set of MOSFETs
bambadoo - 4 PCBs
medisinmannen - 2 PCBs + 1 set of MOSFETs
jacques antoine - 2 PCBs
Asuslover - 2 PCBs
vasillis - 4 PCBs
fencki - 2 PCBs
meanman1964 - 2 PCBs
muthumuthiah - 2 PCBs (stereo kit)
craydive - 2 PCBs + 1 set of MOSFETs
ckwong99 - 2 PCBs + 1 set of MOSFETs
jls001 - 2 PCBs (stereo kit)
tome - 2 PCBs
mexakin - 2PCBs
pieter t - 2 PCBs
reaper996 -2 PCBs + 1 set of MOSFETs
883bkong -2 PCBs
emynet - 2 PCBs + 1 set of MOSFETs
patriz - 2 PCBs
CitizenKane - 6 PCBs
Lutto - 4 PCBs
 
shaan

shaan

Member
Joined 2009
GB Update:

rajesh - 2 PCBs (stereo kit) - PM SENT
vgeorge - 2 PCBs + 1 set of MOSFETs - PAID
gwrskien - 4 PCBs + 1 set of MOSFETs - PAID
bambadoo - 4 PCBs - PAID
medisinmannen - 2 PCBs + 1 set of MOSFETs - PAID
jacques antoine - 2 PCBs - PAID
Asuslover - 2 PCBs - PAID
vasillis - 4 PCBs - INVOICE SENT
fencki - 2 PCBs - PM SENT
meanman1964 - 2 PCBs - PAID
muthumuthiah - 2 PCBs (stereo kit) - PAID
craydive - 2 PCBs + 1 set of MOSFETs - INVOICE SENT
ckwong99 - 2 PCBs + 1 set of MOSFETs - PAID
jls001 - 2 PCBs (stereo kit) - PM SENT
tome - 2 PCBs - INVOICE SENT
mexakin - 2PCBs - PM SENT
pieter t - 2 PCBs - PAID
reaper996 -2 PCBs + 1 set of MOSFETs - INVOICE SENT
883bkong -2 PCBs - PM SENT
emynet - 2 PCBs + 1 set of MOSFETs - INVOICE SENT
patriz - 2 PCBs - INVOICE SENT
CitizenKane - 6 PCBs - PAID
Lutto - 4 PCBs - INVOICE SENT

If there is any mistake in the above list please let me know.

I plan to wait until 22 January Monday before placing the batch order, so anyone interested can still join.
 
shaan

shaan

Member
Joined 2009
GB Update:

rajesh - 2 PCBs (stereo kit) - INVOICE SENT
vgeorge - 2 PCBs + 1 set of MOSFETs - PAID
gwrskien - 4 PCBs + 1 set of MOSFETs - PAID
bambadoo - 4 PCBs - PAID
medisinmannen - 2 PCBs + 1 set of MOSFETs - PAID
jacques antoine - 2 PCBs - PAID
Asuslover - 2 PCBs - PAID
vasillis - 4 PCBs - PAID
fencki - 2 PCBs - PAID
meanman1964 - 2 PCBs - PAID
muthumuthiah - 2 PCBs (stereo kit) - PAID
craydive - 2 PCBs + 1 set of MOSFETs - PAID
ckwong99 - 2 PCBs + 1 set of MOSFETs - PAID
jls001 - 2 PCBs (2 x pre-assembled modules) - PAID
tome - 2 PCBs - INVOICE SENT
mexakin - 2PCBs - PM SENT
pieter t - 2 PCBs - PAID
reaper996 -2 PCBs + 1 set of MOSFETs - PAID
883bkong -2 PCBs - PAID
emynet - 2 PCBs + 1 set of MOSFETs - PAID
patriz - 2 PCBs - PAID
CitizenKane - 6 PCBs - PAID
Lutto - 4 PCBs - PAID
mj777 - 2 PCBs - PAID
Joca - 2 PCBs - PM SENT
 
yoaudio

yoaudio

Member
Joined 2010
Paid Member
rajesh - 2 PCBs (stereo kit) - INVOICE SENT
vgeorge - 2 PCBs + 1 set of MOSFETs - PAID
gwrskien - 4 PCBs + 1 set of MOSFETs - PAID
bambadoo - 4 PCBs - PAID
medisinmannen - 2 PCBs + 1 set of MOSFETs - PAID
jacques antoine - 2 PCBs - PAID
Asuslover - 2 PCBs - PAID
vasillis - 4 PCBs - PAID
fencki - 2 PCBs - PAID
meanman1964 - 2 PCBs - PAID
muthumuthiah - 2 PCBs (stereo kit) - PAID
craydive - 2 PCBs + 1 set of MOSFETs - PAID
ckwong99 - 2 PCBs + 1 set of MOSFETs - PAID
jls001 - 2 PCBs (2 x pre-assembled modules) - PAID
tome - 2 PCBs - INVOICE SENT
mexakin - 2PCBs - PM SENT
pieter t - 2 PCBs - PAID
reaper996 -2 PCBs + 1 set of MOSFETs - PAID
883bkong -2 PCBs - PAID
emynet - 2 PCBs + 1 set of MOSFETs - PAID
patriz - 2 PCBs - PAID
CitizenKane - 6 PCBs - PAID
Lutto - 4 PCBs - PAID
mj777 - 2 PCBs - PAID
Joca - 2 PCBs - PM SENT
yoaudio - 2 PCBs + 1 set of MOSFETs
 
yoaudio

yoaudio

Member
Joined 2010
Paid Member
rajesh - 2 PCBs (stereo kit) - INVOICE SENT
vgeorge - 2 PCBs + 1 set of MOSFETs - PAID
gwrskien - 4 PCBs + 1 set of MOSFETs - PAID
bambadoo - 4 PCBs - PAID
medisinmannen - 2 PCBs + 1 set of MOSFETs - PAID
jacques antoine - 2 PCBs - PAID
Asuslover - 2 PCBs - PAID
vasillis - 4 PCBs - PAID
fencki - 2 PCBs - PAID
meanman1964 - 2 PCBs - PAID
muthumuthiah - 2 PCBs (stereo kit) - PAID
craydive - 2 PCBs + 1 set of MOSFETs - PAID
ckwong99 - 2 PCBs + 1 set of MOSFETs - PAID
jls001 - 2 PCBs (2 x pre-assembled modules) - PAID
tome - 2 PCBs - INVOICE SENT
mexakin - 2PCBs - PM SENT
pieter t - 2 PCBs - PAID
reaper996 -2 PCBs + 1 set of MOSFETs - PAID
883bkong -2 PCBs - PAID
emynet - 2 PCBs + 1 set of MOSFETs - PAID
patriz - 2 PCBs - PAID
CitizenKane - 6 PCBs - PAID
Lutto - 4 PCBs - PAID
mj777 - 2 PCBs - PAID
Joca - 2 PCBs - PM SENT
yoaudio - 2 PCBs + 1 set of MOSFETs - PAID
yoaudio - 1 PCB + MOSFETs for 1 Board (sub build)
 
shaan

shaan

Member
Joined 2009
rajesh - 2 PCBs (2 x pre-assembled modules) - PAID
vgeorge - 2 PCBs + 1 set of MOSFETs - PAID
gwrskien - 4 PCBs + 1 set of MOSFETs - PAID
bambadoo - 4 PCBs - PAID
medisinmannen - 2 PCBs + 1 set of MOSFETs - PAID
jacques antoine - 2 PCBs - PAID
Asuslover - 2 PCBs - PAID
vasillis - 4 PCBs - PAID
fencki - 2 PCBs - PAID
meanman1964 - 2 PCBs - PAID
muthumuthiah - 2 PCBs (stereo kit) - PAID
craydive - 2 PCBs + 1 set of MOSFETs - PAID
ckwong99 - 2 PCBs + 1 set of MOSFETs - PAID
jls001 - 2 PCBs (2 x pre-assembled modules) - PAID
mexakin - 2 PCBs - PM SENT
pieter t - 2 PCBs - PAID
reaper996 -2 PCBs + 1 set of MOSFETs - PAID
883bkong -2 PCBs - PAID
emynet - 2 PCBs + 1 set of MOSFETs - PAID
patriz - 2 PCBs - PAID
CitizenKane - 6 PCBs - PAID
Lutto - 4 PCBs - PAID
mj777 - 2 PCBs - PAID
yoaudio - 2 PCBs + 1 set of MOSFETs - PAID
yoaudio - 1 PCB + MOSFETs - PAID
Joca - 2 PCBs - INVOICE SENT
tome - 2 PCBs - INVOICE SENT

PCBs ordered. Expecting them at hand between 12 and 15 Feb.
Thanks everyone for your patience and for joining this GB.
 
shaan

shaan

Member
Joined 2009
Hello GB members and anyone reading.

Here is an update on the layout of the V4H that's been sent to the fab for printing. It is slightly different from the one shown in Post#1 and for a good reason - stable operation with unmatched MOSFETs. Read on to know more.

During more experiments last week with V4H I tried to give the amp hell, bypassing the speaker output traces and connecting the source resistors to output node with dangling 1mm enameled copper wires with curves and angles, and switching between three sets of randomly selected unmatched MOSFET pairs. Two sets showed 9MHz and 16MHz parasitic oscillation triggered at 4 and 7V output respectively. The zobel resistors were sitting there uselessly and increasing the 47pF to 100pF didn't help stop the oscillation even the slightest. After two days of hair-pulling the solution came up, and it's simple.

Just re-positioned the zobel and BOOM! No parasitics at all, with any combination of the MOSFET sets! The zobel resistors will now load right at junction of the two source resistors for both N and P MOSFET pairs and with this config I have been unable to make it oscillate with any of the MOSFETs that I have, which are far from matched as I mentioned in earlier posts. I also decreased both resistors to 10R and gave each its own capacitor to kill any and every attempt by the fast output stage to go nuts.

That's all really. The V4H boards that you will be getting will allow for blind selection for MOSFETs (as long as they are Laterals of course) and will facilitate rock-stable operation while delivering pleasant music. Rest assured, there is zero impact on sonics from the mod.

The old schematic and layout in Post#1 has been replaced with the updated ones. Full BOM is ready and will be uploaded in next post.

I know it would be okay if I made a one-line post mentioning that the layout has been changed slightly for stability, but for a layout designer taming parasitics is one of the bigger challenges and I can't express the joy I felt when the fuzz on top of that sinewave vanished! :cloud9:

Thank you all again for all your support!
 
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