Author Topic: Bruno Putzey's DIY Balanced Preamp Group Buy  (Read 13663 times)

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Offline romymartinez

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Bruno Putzey's DIY Balanced Preamp Group Buy
« on: Nov 06, 2017 at 12:28 PM »
I am planning to have this preamp built. I am starting this thread  hoping to generate interest on possible group buy of the PCB. The gerber files for the PCB and the bill of materials for the parts are available from the threads below. The DOST-EPDC can make the PCB for a minimum number of 4 units. They can also provide service for soldering the SMD  (and even trough hole) parts for us whose with no soldering skills. :D

http://www.diyaudio.com/forums/group-buys/279981-bruno-putzeys-balanced-preamp-buy.html
http://www.diyaudio.com/forums/group-buys/287508-bruno-putzeys-balanced-preamp-buy-2-a.html
http://www.diyaudio.com/forums/group-buys/298657-bruno-putzeys-balanced-preamp-buy-3-a.html

All components in the published bill of materials (or its equivalent) are locally available through RS and Element14,.

Cost? In my intitial query DOST-EBDC said it will be at least 2.4K for  4 PCBs (P600 each). Components from RS and Farnell would cost around 4K. This excludes the transformer (2x15V 15-30VA), enclusre, (and the drilling/cutting/CNC), IEC, pilot light and some other minor components and labor services for us with no skills. :D


From Bruno Putzey's article:

Quote

"I have a double agenda in presenting this demonstration project. Firstly just to demonstrate how the "new" design methodology works in practice, but secondly to invite doubters to discover for themselves how a bit of rational engineering can produce staggeringly good sonics without resorting to boutique parts or boutique thinking. This is going to be the cheapest and best-sounding preamplifier you've ever built."


:D
« Last Edit: Nov 08, 2017 at 11:59 AM by romymartinez »

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #1 on: Nov 06, 2017 at 02:52 PM »
what is the size of the pcb? 600 php for 1 pcb is kinda steep, I had mine fabricated by my friend in China for only a fraction of that cost. this looks like a god project as I still have 2 torroid with the same specs  that I got from Mouser few months ago

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #2 on: Nov 06, 2017 at 02:58 PM »
Images from the diyaudio.com group buy

« Last Edit: Nov 06, 2017 at 03:03 PM by romymartinez »

Offline tony

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Re: Bruno Putzey's Balanced Preamp
« Reply #3 on: Nov 06, 2017 at 04:48 PM »
what is the size of the pcb? 600 php for 1 pcb is kinda steep, I had mine fabricated by my friend in China for only a fraction of that cost. this looks like a god project as I still have 2 torroid with the same specs  that I got from Mouser few months ago

same project as diyaudio? Dandy Menor can design a balanced input/output line amp easy...i have a pair of balanced input output XLR boards from thailand, i forgot how much i got them for....doesn't cost that much...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #4 on: Nov 06, 2017 at 05:08 PM »
same project as diyaudio? Dandy Menor can design a balanced input/output line amp easy...i have a pair of balanced input output XLR boards from thailand, i forgot how much i got them for....doesn't cost that much...
different project sir tony, but I had my Objective 2 HP amp board and Sapphire amp by RJM from diyaudio fabricated via dandy for a fraction of a cost.

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #5 on: Nov 06, 2017 at 07:49 PM »
Hi Sir Rochie, the dimensions are 49 mm by 140 mm. :D

If you know where I (or the GB if materializes) can have it built much cheaper then your help will be very much appreciated. :D


Offline romymartinez

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Offline tony

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Re: Bruno Putzey's Balanced Preamp
« Reply #7 on: Nov 07, 2017 at 06:41 AM »
i will post this in our FB user group, there are at least ten board layout artists in our group who can do layouts...

the simplest solution to balanced in and balanced out stage is the use of interstage traffos from sowter, jensen or cinemag edcor or hammond...a 10k:10k traffo is good to use here...

i bet Edrel Sison can make such traffos too using the z11 cores...
« Last Edit: Nov 07, 2017 at 06:42 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline romymartinez

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Offline tony

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how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #11 on: Nov 07, 2017 at 01:58 PM »
rochie, pwede pa quote kay Dandy?

sige ill check the size and layers, FR4 and 2oz copper?

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #12 on: Nov 07, 2017 at 02:14 PM »
for boards that are not greater than 10cmX10cm nasa 1000 lang for 8pcs I think,shipping not included.
ilang boards ba ang kailangan? Dandy also offers board assembly with SMT components
« Last Edit: Nov 07, 2017 at 02:20 PM by rochie »

Offline tony

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Re: Bruno Putzey's Balanced Preamp
« Reply #13 on: Nov 07, 2017 at 02:48 PM »
sige ill check the size and layers, FR4 and 2oz copper?

1 oz is enough para mas mura, wala namang high currents na dadaloy...
black looks good...
FR4 of course...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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Re: Bruno Putzey's Balanced Preamp
« Reply #14 on: Nov 07, 2017 at 02:50 PM »
for boards that are not greater than 10cmX10cm nasa 1000 lang for 8pcs I think,shipping not included.
ilang boards ba ang kailangan? Dandy also offers board assembly with SMT components

SMT seems to be a good idea...minimum qty... i guess...
as for shipping he can hand carry in one of his trips here.....:D
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #15 on: Nov 07, 2017 at 04:07 PM »
SMT seems to be a good idea...minimum qty... i guess...
as for shipping he can hand carry in one of his trips here.....:D


sayang di na aabot,uuwi siya sa 17 at may event daw sila sa Baguio, inaaya nga ako kung meron ako project na pwede ko i display sa event niya. I Think walang min qty for PCB assembly with SMT parts,balik na daw ulit sila sa dati kasi free na ulit yung ibang mga kasama niya, so baka continue ulit mga diy kits na semi-assembled.

@romy - kung madami interest sa GB nito baka gusto nila na assembled na yung mga smt components para hindi na mahirap magbuo. may estimate ka na ba kung mga ilang pc kaya?

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #16 on: Nov 07, 2017 at 05:35 PM »
Wow Sir Tony and rochie. Thank you for your interest to this project.

Yes, i would also be interested with pre-assembled SMT.

How many PCBs? I hope this thread would generate the interest and the estimated number. :D

1. romymartinez
2. ....
3. ....
...

:D
« Last Edit: Nov 07, 2017 at 05:40 PM by romymartinez »

Offline tony

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Re: Bruno Putzey's Balanced Preamp
« Reply #17 on: Nov 07, 2017 at 05:41 PM »
copy paste nyo na lang...

1. romymartinez
2. ....tony tecson 2 boards...
3. ....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #18 on: Nov 07, 2017 at 05:41 PM »
bro romy - sent you a PM

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #19 on: Nov 07, 2017 at 06:03 PM »
1. romymartinez 1 bare board, 1 board with SMT
2. ....tony tecson 2 boards...
3. ....

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #20 on: Nov 07, 2017 at 09:08 PM »
Picture of preamp beard assebled by a diyaduio.com member:


Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #21 on: Nov 07, 2017 at 09:41 PM »
9 boards confirmed for fabrication. ETA 2-3rd week of November

1. romymartinez 1 bare board, 1 board with SMT
2. ....tony tecson 2 boards...
3. ....rochie 1 board

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #22 on: Nov 07, 2017 at 09:48 PM »
9 boards confirmed for fabrication. ETA 2-3rd week of November

GB for 9 boards:

1. romymartinez
2. romymartinez
3. tony
4. tony
5. rochie
6. ..
7. ..
8.. ..
9. ..

Four boards still available :D

Offline parasound

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Re: Bruno Putzey's Balanced Preamp
« Reply #23 on: Nov 08, 2017 at 01:05 AM »
Count me in..  1 board with parts na ha.. thanks


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Fullrange.. Fullrange.. Fullrange.. Fullrange

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #24 on: Nov 08, 2017 at 07:07 AM »
Count me in..  1 board with parts na ha.. thanks

Noted Sir parasound :D

GB for 9 boards:

1. romymartinez
2. romymartinez
3. tony
4. tony
5. rochie
6. parasound
7. ..
8.. ..
9. ..

3 boards still available :D


Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #25 on: Nov 08, 2017 at 07:23 AM »
GB for 9 boards:

1. romymartinez
2. romymartinez
3. tony
4. tony
5. rochie
6. parasound
7. ..
8.. ..
9. ..

3 boards still available :D

Interested with SMD parts  and assembly GB
(arrangements for our further discussions)

1. romymartinez
2. rochie
3. parasound
4. ...


Offline ndotcom

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Re: Bruno Putzey's Balanced Preamp
« Reply #26 on: Nov 08, 2017 at 07:38 AM »
How much kaya abutin neto with parts na?

Offline rochie

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Re: Bruno Putzey's Balanced Preamp
« Reply #27 on: Nov 08, 2017 at 08:26 AM »
How much kaya abutin neto with parts na?
Guesstimate ko sa parts mga 3-4k,ang medyo mahal yung xlr connector kung reputable brand ang bibilhin. Try ko gumawa ng project sa mouser para makakuha ng quote. Yung torroid nito nasa 700 ang isa from mouser din.

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Offline tony

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Re: Bruno Putzey's Balanced Preamp
« Reply #28 on: Nov 08, 2017 at 10:08 AM »
rochie, i do not like torroids for these type of amps, an EI with primary screens is much better for noise...

and since the boards were designed for smt's it makes more sense to get them with the resistors soldered in....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline romymartinez

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Re: Bruno Putzey's Balanced Preamp
« Reply #29 on: Nov 08, 2017 at 11:17 AM »
Guesstimate ko sa parts mga 3-4k,ang medyo mahal yung xlr connector kung reputable brand ang bibilhin. Try ko gumawa ng project sa mouser para makakuha ng quote. Yung torroid nito nasa 700 ang isa from mouser din.

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I think Sir rochies guesstimate is about right. When I made an estimate of cost of parts for 1 pcb using RS Philippines and element14 Philippines it's around 4.1K excluding the trafo. With group buy malamang mas mura if we can have the numbers and  from Mouser. :D
« Last Edit: Nov 08, 2017 at 11:24 AM by romymartinez »