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Old 4th February 2013, 11:17 PM   #1
Reality first!
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Join Date: May 2005
Location: Milan, Italy
Default My_Ref Fremen Edition Interest/Group Buy

Hi all,

This thread starts to test interest/organize a group buy for the My_Ref Fremen Edition, a variation of Mauro Penasa's My_Ref with this goals:
  • a more stable and performing amp using SMD parts
  • raise LM318's PS voltage thanks to a voltage limiter
  • better PS for LM318
I've designed a brand new PCB with these features:
  • bigger caps (16mm diameter with both 7 and 5 mm pads) for C1, C2, C9
  • large use of SMD components
  • quite all small caps and some critical resistors are still through-hole
  • very small paths thanks to SMD
  • ground planes design
  • zener limiter based on schematic 5b from this link (which seems pretty similar to My_Evo one)
  • CCS shunt PS for the LM318
  • An alternate C9/R10 arrangement
  • Different grounding
  • Different compensation
  • a double diode bridge like in most gainclones
Both PCB and schematic have been tested organizing beta and release candidate mini group buys

I've been authorized by Mauro Penasa to proceed with this My_Ref derivate amp.

Click the image to open in full size.

You can find references on development, beta and release candidate here:

My_Ref Fremen Edition - need help on PCB evaluation - diyAudio
My_Ref Fremen Edition - Beta build/Fine tuning - diyAudio
My_Ref Fremen Edition RC - Build thread - diyAudio

Schematic
Google Drive BOM
Mouser BOM

Prices will depend on number of partecipants/kits, the Group Buy is about PCBs only

Approximate prices (one kit = 2 PCBs, PayPal fees and 2€/kit donation to DIY audio included):

25-49 kits 36€
50-99 kits 28€
100-199 kits 24€
200 or more 22€

Shipping prices will be (for each kit, for 2 kits add 1€):

Italy 7€
Europe 10€
Rest of the world apart Oceania 13€
Oceania 14€

PCBs will be blue, 2mm tick, 2 Oz/70um copper, gold plated, made in Italy.

BOM cost is around 76€ per board (premium industrial BOM) which can be lowered to 52€ (On a budget BOM)

If interested please fill your nickname, country and number of kits on the Google Spreadsheet

Greetings:
Mauro Penasa for his great design and kind permission
LinuxGuru for his help on new compensation
Luka for the LM318 PS initial design
Soongsc, Marce, Sebaastian, KSTR and Metal for help on PCB design
BMCBob for all support, tests and reviews

Images of RC boards:

Click the image to open in full size.

Click the image to open in full size.
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ClaveFremen "Bailando Salsa en el Sietch" - My_Ref Fremen Edition GB

Last edited by ClaveFremen; 6th June 2013 at 10:18 PM.
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Old 5th February 2013, 07:57 AM   #2
Marra is offline Marra  United Kingdom
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I'm in for one possibly two sets.Thanks Dario.
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Old 5th February 2013, 09:11 AM   #3
Reality first!
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Quote:
Originally Posted by Marra View Post
I'm in for one possibly two sets.Thanks Dario.
Welcome on board

Please fill in the Google Docs Spreadsheet
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ClaveFremen "Bailando Salsa en el Sietch" - My_Ref Fremen Edition GB
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Old 5th February 2013, 03:59 PM   #4
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I've been looking forward for this. The My_Ref is certainly one of the best circuits i've ever built. I get impressive results with it. Can't wait to see what this new implementation gives.

Dario:
I put the country as Brazil on the spreadsheet. i will, however, be moving to Italy next April. Does that make a difference for now?
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Old 5th February 2013, 05:21 PM   #5
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Hooray !
I m in !
Months of waiting - over !
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Old 5th February 2013, 05:39 PM   #6
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+1 :-)
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Old 5th February 2013, 05:43 PM   #7
Reality first!
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Quote:
Originally Posted by ilovepicles View Post
The My_Ref is certainly one of the best circuits i've ever built. I get impressive results with it. Can't wait to see what this new implementation gives.
I think you'll be amazed...

Quote:
Originally Posted by ilovepicles View Post
I put the country as Brazil on the spreadsheet. i will, however, be moving to Italy next April. Does that make a difference for now?
The GB will close in some weeks, around the end of February and boards should be ready for shipping by the end of March.

It depends on you.

If you want to wait April I can ship it to Italy when you move so you can avoid import duties.
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ClaveFremen "Bailando Salsa en el Sietch" - My_Ref Fremen Edition GB
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Old 5th February 2013, 05:53 PM   #8
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Join Date: Oct 2010
Location: the Matrix? Maybe?
Quote:
Originally Posted by ClaveFremen View Post
I think you'll be amazed...
Good to hear!

Quote:
Originally Posted by ClaveFremen View Post
The GB will close in some weeks, around the end of February and boards should be ready for shipping by the end of March.
I thought it would take longer than that. In that case, i will put Italy in the spreadsheet. My girlfriend is already living in Rome so i'll provide her address for the shipping then. Thanks.
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Old 6th February 2013, 08:21 AM   #9
atupi is offline atupi  Romania
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Location: Bucharest
I'm using this amp since few months (from previous GB) and he amazes me every day. Use finest parts and you will be rewarded by a very smooth and precise sound. You will be limited only by your speakers.
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Old 7th February 2013, 07:17 PM   #10
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Location: Rome
Hi Dario,
i'm in for 2 kits, thank you!
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