Bruno Putzeys Balanced Preamp - Group Buy

[simeon_noir]

I have covered both bases, one PCB, one module.

 

[misterdog]

30 units for PCB reached..

 

[vanwykca]

Added myself for one module.

Thank you for organising this.

 

[emyeuoi]

Added one PCB

Thanks!

 

[42001]

Added myself for 2 boards!

 

[misterdog]

Interest shown for 38 boards so far, surely we could go for the Eurocircuits 50 board option if we all agree to pay say 8/9 euros each to cover 'spares'.

 

[42001]

No problem, but what happens when you sell them? Maybee I don't quite get it ��

 

[misterdog]

Well it's your group buy but your PCB manu is charging outrageous prices. My not-so-cheap eurocircuits want € 115 for 10, € 160 for 20 or € 190 for 30. Or € 250 for 50 - that's € 5 a piece. 7 working days.
No setup, no design, no nothing.
Ex VAT so depending on your situation you may need to add a buck. Still very good.

Post from Jan.Didden

If we order 50 boards @ 250Eur +Vat (20% ?) +shipping, unit price is 6 Eeur
(plus shipping) though we only have 38 orders so far.

300 Eur. divided by 38 = 8 Eur. each plus shipping

with 12 spare boards.

If we can 'advertise' the fixed board price and give a cost for a parts BOM and some info on power supply we could have more interest from less experienced builders.

 

[42001]

Sounds good to me�� A good BOM and maybee even parts kits would help this group buy I think.

 

[edd9000]

If we use the eurocircuits option at 6-8 euros a piece I would order 3.

 

[misterdog]

If we use the eurocircuits option at 6-8 euros a piece I would order 3.

So would I.

There is another preamp currently underway by Linear Audio/ Doug Self.

One of their team (madinventor) has designed a power supply that we may be able to utilise.

http://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-6.html

 

[Allelom]

I am a new user. I found the buying group after finding the pattern schematic of Bruno. It uses SMD components, but I have difficulty to settle them. Then I ask if the PCB with SMD as per page 12 of Hypex white page is new or without SMD components.
Thank you.

 

[42001]

Guys, sorry but I took myself off the list. Too much projects already...

 

[chalkandtalk]

Update?

 

[pinnocchio]

Hi Bertel,

It would be great that you include the mfg part # in the BoM since we don't have Farnell in North America

Also, are you re-creating the same PCB run that was done on Linear Audio or you've taking note of the suggested volume wiper issue and other design considerations that were posted?

Thanks
Do

 

[chalkandtalk]

I too have withdrawn.

 

[hfxrzw]

Added for both options, should be right �� Thanks for organizing this!

 

[lohk]

If there will not be enough interest for the ready made version I am of course also interested in the pcb alone.

 

[Tazzz]

How about some arrangements for a simple predrilled case from any of the china vendors?

Or for the hypex regulators, I already have a PCB from Linearaudio

 

[NATDBERG]

Yes, it's in the schematic - this stereo module has two stereo XLR inputs (including a toggle switch triggering a relay to select the input) and one stereo XLR output.

I'm interested in these and would go for a couple of fully built modules.

EDIT (deleted most of my post): I see from the BOM that it does indeed have 4 x input XLRs and 2 x output XLRs so is definately a stereo module. Subtle english use of singular and plurals made it sound like there was only one single XLR output connector which you were mistakenly calling "stereo" (as per Bruno's mono board schematic in the PDF).

One stereo pair of XLR outputs ... cool!

Fingers crossed that we get enough built modules!

One question, in Bruno's paper he mentions tightly matched resistors - will the built modules have tightly matched resistors ?