MyRef_C with Ultimate BOM

[regiregi22]

Thank you,

I am hoping other builders will come up with the +5v PSU and select a 100k dual log pot.

I don't have the skills to design a PSU board.

Read again the LDR description to see a PSU I designed for the purpose.

In this file, look at the folder called LDR PSU regulator, inside LDR volume control folder. There you have a BOM with some recommended pots.
MyRef_C_Ultimate_Documentation_v1.1.rar

 

[AndrewT]

move your LDR enquiries to an LDR thread.

 

[ppcblaster]

move your LDR enquiries to an LDR thread.

I am not talking just about the LDR, just the process involved in building this project, will there be a building thread?

Thanks

 

[regiregi22]

I am not talking just about the LDR, just the process involved in building this project, will there be a building thread?

Thanks

Will there be.

 

[AndrewT]

There will be a "build MyRef_C" thread.

If you want/need a "build MyLDR" thread then start one.

 

[udailey]

Tested the caps on my Lightspeed. At min position or max position with the LDRs sucking as much power as they can the time allowed was nearly nothing on both a 1000uf and a 12000uf cap. If you turn the volume just a small amount either way of max or min then we get about 4 seconds with 1000uf and about 9 seconds with 12000uf. I didnt use a stopwatch or anything, just counting in my head. At half volume the time with the 12000uf goes on and on and on, way more than we need. So I would say that maybe 2 1000uf should be great after the regulator and before the 100k dual log pot.
Uriah

 

[AndrewT]

At half volume the time with the 12000uf goes on and on and on, way more than we need. So I would say that maybe 2 1000uf should be great

That complies with the recommendation that the LDRs have minimum current when in stand by.

 

[AndrewT]

Now can we keep this thread on the MyRef_C tpoic?

 

[udailey]

Andrew this is a group buy thread in which at least 30 people in the group bought LDRs and will be using them with their MyREFC. I think these questions are right on topic.
Uriah

 

[ppcblaster]

What is the secondaty voltage of the two 150VA per channel transformers for this project?

Perhaps part numbers from Antek, inc and The Avel Lindberg.

Thank You.

 

[udailey]

22vac or 24vac.
Antek would be AN2222 or AN4222. They dont seem to have 24V til 600VA that would be suitable for this project. You could use the 600VA of course, but its way larger then you need.
Uriah

 

[ppcblaster]

22vac or 24vac.
Antek would be AN2222 or AN4222. They dont seem to have 24V til 600VA that would be suitable for this project. You could use the 600VA of course, but its way larger then you need.
Uriah

Would 25v work?

 

[ppcblaster]

From AVEL

Load Secondary AVEL Part Number

160VA 12+12 Y236500 wired in Series = 24v


160VA 25+25 Y236504

 

[ppcblaster]

22vac or 24vac.
Antek would be AN2222 or AN4222. They dont seem to have 24V til 600VA that would be suitable for this project. You could use the 600VA of course, but its way larger then you need.
Uriah

I emailed Antek and was told they have AN-2224 $29 each plus shipping.

I couldn't find it on their website so I called Maria at (201) 991-3300 and was told Antek modifies the
AN- 2225 to a 24v secondary and call it AN-2224.

 

[ClaveFremen]

Would 25v work?

Yes, unless your speakers are 4 Ohm.

The Nuvotem transformer suggested by Mauro is a 2x25V.

The 200VA Antek transformer is OK for a single monoblock, for a stereo configuration a bigger one is better (300VA)

 

[ppcblaster]

Yes, unless your speakers are 4 Ohm.

The Nuvotem transformer suggested by Mauro is a 2x25V.

The 200VA Antek transformer is OK for a single monoblock, for a stereo configuration a bigger one is better (300VA)

Thank you, it was that extra volt I was concerned about, 25v will not cause an overvoltage condition on the rails?

One more question, is the Antek as good as the Avel brand? The Antek is $29 usd each plus shipping and the Avel is $41.61 usd

 

[ClaveFremen]

Almost all people from the Audiofaidate forum that built the original MyRef used that 2x25V Nuvotem...

And as I've already said was Mauro Penasa himself that suggested it.

You can see for yourself reading the MyRef Evolution BOM.

Regarding the two brands I can't help you as I don't know them.

 

[regiregi22]

I think the topic of integrating the LDR into the MyRefC is adecuate in this thread, is part of the kit.
I am now fitting some caps around the regulator. I have found 2200uF 6.3v from a switching PSU I had from work. I may fit 4 of them, making around 8800uF.

25v will work. That is what I will be using, 250VA for two MyRef C

 

[ppcblaster]

I think the topic of integrating the LDR into the MyRefC is adecuate in this thread, is part of the kit.
I am now fitting some caps around the regulator. I have found 2200uF 6.3v from a switching PSU I had from work. I may fit 4 of them, making around 8800uF.

25v will work. That is what I will be using, 250VA for two MyRef C

Is that 250va one transformer for both channels?

What brand transformer did you select?

 

[regiregi22]

The one most readily available from Farnell: Nuvotem. Is the european brand of an american brand, if I remember well. I have been using this brand since I am in this, and they work very well. No buzzes or sounds, no heat, and give the voltage and power you demand from it. What else can you ask to a transformer?