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Old 13th February 2013, 04:51 PM   #31
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Quote:
Originally Posted by fromthecrowd View Post
I also signed in the hope to soon feel the sound of this intriguing amplifier.
Welcome

Quote:
Originally Posted by Justadude View Post
Does your design have the same power requirements as a normal lm3886 type amp, 18-22v for 4ohm speakers and 23-36v for 8ohm speakers? These toroids are 400-800va ..is this ok?
Transformer requirements are:

160VA min, dual secondaries 24-25V (8 Ohm) or 21-22V (4 Ohm)

Higher VA ratings give a fuller sound,

R-Cores requirements are lower my 120VA one sound louder than a 225VA toroid.

For each kit (2 channel) two tranformers are required.

I would suggest partecipants to read at least the RC build thread, a lot of questions are already answered on it.
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Old 13th February 2013, 09:09 PM   #32
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Default Render of PCBs

I've just figured out that I didn't posted any image of the final boards...

You'll find attached a render of the PCBs.

The main difference from Release Candidate boards is the fixed cofiguration for C9/R10 (different from My_Ref original one, as suggested by KSTR and tested during RC phase).

Other minor differences are some holes diameter and a more refined trace toward R3.

One final note about price... we've reached 35 kits/70 PCBs, price so far dropped to 32€/kit
Attached Images
File Type: jpg My_Ref_FE Top.jpg (205.0 KB, 389 views)
File Type: jpg My_Ref_FE Bottom.jpg (123.8 KB, 373 views)
File Type: jpg My_Ref_FE Eagle.jpg (466.5 KB, 276 views)
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Last edited by ClaveFremen; 13th February 2013 at 09:19 PM.
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Old 13th February 2013, 10:33 PM   #33
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Yeah baby!
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DACs : TPA Buffalo II + OPC's NTD1 I/V | TPA OPUS + IVY III Speakers : Jim Holtz Statements | Astasia SD | Tubasson Mark 2
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Old 13th February 2013, 11:42 PM   #34
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Have been waiting for this.
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Old 14th February 2013, 01:32 PM   #35
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what are the board dimensions with premium bom (caps)? do you think a stereo set + toroid can fit on the galaxy hifi2000 enclosures? (the 23x28x8)
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Old 14th February 2013, 01:52 PM   #36
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what are the board dimensions with premium bom (caps)? do you think a stereo set + toroid can fit on the galaxy hifi2000 enclosures? (the 23x28x8)
Like this one?

Click the image to open in full size.

But you will probably have to use R-Cores like I did, toroids are larger...
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Old 16th February 2013, 09:35 AM   #37
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Hello Dario,

I read in the past great reviews of My_Ref amplifiers and I'm considering to build one for myself, then I'm happy that you are kindly starting a GB of an improved implementation.
I have some questions about your implementation (maybe some of them are covered elsewhere, this is just to collect info here):

1) about the transformer/s: do you think that 22Vac secondaries are ok?

2) is it known the behavior of my_ref amplifiers with low impedance speakers? (I have 4Ohm speakers, even with lower impedance minimum...)

3) about your kit, is the BOM available? (I read that you made a cost estimation already). If not, will you make one available here?

Thank you,

Daniele
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Old 16th February 2013, 03:59 PM   #38
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Ciao Daniele,

Quote:
Originally Posted by spinwell View Post
1) about the transformer/s: do you think that 22Vac secondaries are ok?
For 4 Ohm speakers, yes

Quote:
Originally Posted by spinwell View Post
2) is it known the behavior of my_ref amplifiers with low impedance speakers? (I have 4Ohm speakers, even with lower impedance minimum...)
It really depends on the speakers...

The My_Ref (and the FE has same advantages/limitations in this regard) has great driving abilities on 8 Ohm speakers and on most 4 Ohm (21-22V secories required) ones but it's still a 40W amp and very demanding speakers can cause troubles.

But I've no way to tell it in advance...

Quote:
Originally Posted by spinwell View Post
3) about your kit, is the BOM available? (I read that you made a cost estimation already). If not, will you make one available here?
Both BOMs can be found on the first post of Release Candidate thread.
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Old 16th February 2013, 10:34 PM   #39
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Default The countries race

So far:

IT 6 US 4 CA 4 UK 3 CH 2 SI 1 RU 1 RO 1 ES 1 DK 1 DE 1 AU 1

Various new countries (Vs RC), a lot of partecipants from Canada
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Old 17th February 2013, 01:33 AM   #40
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25Vac supply is good for both 8 ohms and 4 ohms load, right?

Do
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