My_Ref Fremen Edition GB (Second run) - Page 4 - diyAudio
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Old 4th June 2013, 08:39 PM   #31
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Looks like Iīm late.

Dario, count me in for a future batch.

Grazie
Alex

Last edited by Alexandre; 4th June 2013 at 08:45 PM.
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Old 6th June 2013, 03:12 PM   #32
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Default Place Revision Number and date on BOM, etc.

Place the Revision Number (1.02) and Revision Date (March 2013) on the
BOM and Schematic. This also applies to the build instruction manner.
This help user's keep track of changes. Take care and great work.
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Old 6th June 2013, 06:50 PM   #33
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Location: Milan, Italy
Quote:
Originally Posted by mrsavage View Post
Place the Revision Number (1.02) and Revision Date (March 2013) on the BOM and Schematic. (....) This help user's keep track of changes.
No changes on schematic, BOM and build intructions from the last GB.

Also Release Candidate boards have little or no difference.

Quote:
Originally Posted by mrsavage View Post
Take care and great work.
Thanks
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Old 15th June 2013, 03:54 PM   #34
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It looks like the schematic link is down.
I just had a thud come through when powering up this morning.
Does anyone no how to increase the turn on delay time for the relays?
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Old 21st June 2013, 08:10 PM   #35
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Default Boards have arrived!

Click the image to open in full size.

Shipping will begin next week
Attached Images
File Type: jpg Boards.jpg (304.4 KB, 366 views)
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Old 21st June 2013, 08:33 PM   #36
bcmbob is offline bcmbob  United States
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Old 28th June 2013, 09:47 PM   #37
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Default Shipping adn DIYAudio donation

I've just donated 32€ do DIY Audio as per GB conditions.

All packages will be shipped tomorrow, except two partecipants.
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Old 1st July 2013, 09:49 PM   #38
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Default All packages shipped

All packages shipped (apart BTW), please post and update Google Spreadsheet when packages arrive.

Thanks in advance.
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Old 3rd July 2013, 05:23 PM   #39
redjr is offline redjr  United States
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Quote:
Originally Posted by ClaveFremen View Post
Hi all,

it seems, from the number of requests that the previous GB was missed by a lot of people so I'm organizing a second run.

The My_Ref Fremen Edition is 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.

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
My_Ref Fremen Edition - Build Thread

On my Google Drive you'll find:

Schematic
BOM
Build Tutorial

There's also a shared Mouser BOM to order parts.

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

Approximate prices (one kit = 2 PCBs, PayPal fees and 1€/kit donation to DIY audio included):

10-14 kits 36€ (made in China)
15-24 kits 30€ (made in China)
25-49 kits 32€
50-99 kits 27€
100-199 kits 23€
200 or more 21€

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

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

PCBs (circa 12 x 10.5 cm) will be blue, 2mm tick, 2 Oz/70um copper, gold plated, made in Italy (from 25 kits and up).

One transformer 160VA-300VA will be needed for each board (monoblock design)

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

A complete amp (premium industrial BOM) will cost around 450€ and up.

If interested please PM me your PayPal associated email address and fill your nickname, country (2 letter code) 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
KSTR for the new C9, R10 arrangement.
Soongsc, Marce, Sebaastian, KSTR and Metal for help on PCB design
BMCBob for all support, tests and reviews

Images of boards from previous GB (made in Italy):

Click the image to open in full size.

Click the image to open in full size.
This may be a silly question, but how do I access your shared BOM, or cart on Mouser. The link just takes me to their home page. Since it is shared, I presume I don't need an access ID/code. Yes?
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Old 3rd July 2013, 08:06 PM   #40
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Quote:
Originally Posted by redjr View Post
This may be a silly question, but how do I access your shared BOM, or cart on Mouser. The link just takes me to their home page. Since it is shared, I presume I don't need an access ID/code. Yes?
The Mouser cart was no longer available, I'll added it back.

The BOM on Google Docs should be readable, it's possible that you have to login to Google, though.

I've attached a PDF version of the BOM.

PS
Cut your quotes next time
Attached Files
File Type: pdf My_Ref_FE - BOM.pdf (61.1 KB, 28 views)
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Last edited by ClaveFremen; 3rd July 2013 at 08:23 PM.
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