CRC Power Supply (Class A amplifier)

[spind]

analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 2 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi 6 boards
asanden 2 boards
jpr_pt 4 boards
spind 4 boards



total 108

 

[BigE]

May I have 4 please?

 

[asanden]

Originally Posted by prasi
analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 2 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi 6 boards
asanden 4 boards
jpr_pt 4 boards
spind 4 boards
BigE 4 boards

total 114

 

[prasi]

thanks asenden,
that's the way to go!.
To all,
GB is open until 15/06/2017. After that requests will be kept on reserve list, which may or may not be honored.
regards
Prasi

 

[bloozestringer]

Hi Prasi,

I have built two power supply with the previous version and I was impressed by the quality of the PCB, however I found that the mounting holes for the heat sink were a little bit too small for some suppliers like "Ohmite heatsink TO-220 EA-T220-51E" from Mouser, I would suggest to increase it by 0.1 or 0.2 mm for this new version...

Rgds,
Marc

What heatsinks did you find that do fit Marc?

 

[AdeS]

TO-220 devices

TO-220 devices

 

[prasi]

this would fit as the dia of mounting pin is 2.4mm. pcb hole dia is 2.5mm. http://www.mouser.com/ProductDetail...=sGAEpiMZZMttgyDkZ5WiujRvxLpuO1i6WZ21MHwWP4U=

as the mounting pins on heatsink are for stability, one could simply pass a 2.6mm drill in the existing holes.

in the newer version GB-3, this has already been taken care of by Project16.

 

[potepuh]

Originally Posted by prasi
analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 2 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi 6 boards
asanden 4 boards
jpr_pt 4 boards
spind 4 boards
BigE 4 boards
potepuh 4 boards

total 118

 

[prasi]

update!

Dear all,
Final gerbers received from Project16 and sent to board house.

waiting for a quote. I have fixed the qty of boards as 130 nos..

Originally Posted by prasi
analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 2 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi+friends 10 boards
asanden 4 boards
jpr_pt 4 boards
spind 4 boards
BigE 4 boards
potepuh 4 boards

total 122

 

[Dennis Hui]

Originally Posted by prasi
analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 2 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi+friends 10 boards
asanden 4 boards
jpr_pt 4 boards
spind 4 boards
BigE 4 boards
potepuh 4 boards
Dennis Hui 4 boards

total 126

 

[Carmaux]

Originally Posted by prasi
analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 2 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi+friends 10 boards
asanden 4 boards
jpr_pt 4 boards
spind 4 boards
BigE 4 boards
potepuh 4 boards
Dennis Hui 4 boards
Carmaux 4 boards

total 130

 

[bk856er]

The 130 ordered is now spoken for. 🙂

I'll take 2 more (total 4) if by chance anyone needs to reduce their number or if more boards become available.

BK

 

[bandol83]

Heatsinks choice

What heatsinks did you find that do fit Marc?

These heatsinks will fit, but only STS and STIS versions, STSB version use M3 screw which will need a 3.2 mm hole !

http://www.fischerelektronik.de/web_fischer/en_GB/heatsinks/A04/Extruded%20heatsinks%20for%20PCB%20mounting/PR/SK129_38.1_/$productCard/dimensionParameters/index.xhtml

Marc

 

[aubmar]

GB2 Board finished!

Stunning Quality Boards thanks to Prasi and Project 16!
around 3mv ripple
I did drill the Heatsink mounting holes to 3.2mm

 

[prasi]

Stunning Quality Boards thanks to Prasi and Project 16!
around 3mv ripple
I did drill the Heatsink mounting holes to 3.2mm

Very nice build aubmar, thanks for posting the update.
did you use quasimodo procedure or default values?
also was there any particular reason why you fitted the faston on ac1 like you did?
regards
Prasi

 

[prasi]

The 130 ordered is now spoken for. 🙂

I'll take 2 more (total 4) if by chance anyone needs to reduce their number or if more boards become available.

BK

I will make them available to you, since I havent received any reply from board house (thursday closed holiday for them). I can increase the quantity.

here is the updated list

analogdiy 4 boards (confirmed)
PauloPT 2 boards (confirmed)
Voysto 4 boards (confirmed)
ravid 2 boards (confirmed)
touchdown 4 boards (confirmed)
LHAMP 20 boards (confirmed)
xrk971 (ver1 or ver 2) 8 boards (confirmed)
avinunca 4 boards (confirmed)
AdeS 2 boards (confirmed)
bk856er 4 boards (confirmed)
Lutto 4 boards (confirmed)
DarpMalone 4 boards (confirmed)
rilke1999 6 boards (confirmed)
redarc12 4 boards (confirmed)
bambadoo 4 boards (confirmed)
Philipp23 8 boards (confirmed)
hui13 4 boards (confirmed)
patriz 4 boards (confirmed)
Project16 2 boards
Prasi+friends 10 boards
asanden 4 boards
jpr_pt 4 boards
spind 4 boards
BigE 4 boards
potepuh 4 boards
Dennis Hui 4 boards
Carmaux 4 boards

total 132

 

[Project16]

The fixing holes of the heat sinks will remain at 2.6 mm because it leaves a wide choice possible and for those that are in 3.2 mm it is very easy to enlarge
The opposite (3.2 => 2.6)!

PS: Thank you aubmar for this feedback. 😉

 

[aubmar]

Very nice build aubmar, thanks for posting the update.
did you use quasimodo procedure or default values?
also was there any particular reason why you fitted the faston on ac1 like you did?
regards
Prasi

Thank you Prasi,

I'm using a pair of these boards in an F5 and only one tx so the second board has the same arrangement on AC2 so it jumps to the AC2 on this board and this AC1 jumps to the other board. Just trying to keep it neat but I'm rethinking and looking at two tx because I don't know how to get rid of the hum with a single tx. I read a few articles and posts about caps and resistors on the speaker and input grounds but still don't understand enough to do it!

These PS's are built with your defaults on the schematic using 33k caps and MUR860 diodes with no caps at the diodes, just on the input, and they come out with a very tiny ripple first time! Absolutely brilliant and I'm sure all of the new GB3 guy's will be really looking forward to getting their hands on their pcb's!

Thank you again,
Aubrey

 

[prasi]

Hi Aubrey,
You could perhaps start a thread on the problems being faced about hum or post in a thread that's already created.

I am sure it can be solved if there is a grounding issue in the overall build.
Regards,
Prasi

 

[bandol83]

Hi Praxi,

Can you add 4 more for me please. Here are the photos of the two I have built, still 2 PCB's available but I will need more in the future and this board may become the standard one for transistor power supply 🙂

Marc