So it looks like a 300 or 400 VA 2x25V toroid would be ideal
for a stereo setup.
Do we have a group buy/special deal set up with Antek?
If so, please post the part number and the contact email id there.
I need one with dual 110V primary windings (since my mains in 220V)
and it looks like Anteks will work for me.
TIA!
for a stereo setup.
Do we have a group buy/special deal set up with Antek?
If so, please post the part number and the contact email id there.
I need one with dual 110V primary windings (since my mains in 220V)
and it looks like Anteks will work for me.
TIA!
Toroid Group Buy
Alright guys. Lets see if you want to do a transformer group buy.
Each toroid is surplus from Steve Dunlap. Steve is an amp designer and is recently a member of DIYaudio. He has a debilitating condition making it hard for him to type/box/ship a bunch of toroids. He has about 200 of them. Lets see if we can help him get rid of some and help you guys get a decent little toroid for each of your channels.
The toroids are 160VA and they have dual primaries with 24V each so this is near perfect for this project. So one per stereo kit will work but you will probably and most likely prefer two, plus that iwll allow you do go dual monoblocks which is always a cool bragging right.
I will do the group buy if we get 30 or more toroids.
The price at 30 of them is 22 dollars each plus shipping. Shipping will only be in the states and will be the price of a flat rate box.
Shoot me an email. If I get enough responses I will start a wiki. Who knows maybe we can start something here and get rid of all 200 for him.
By the way anyone can get in on this group buy for the transformers. I dont care if you bought amps or not.
Uriah
Alright guys. Lets see if you want to do a transformer group buy.
Each toroid is surplus from Steve Dunlap. Steve is an amp designer and is recently a member of DIYaudio. He has a debilitating condition making it hard for him to type/box/ship a bunch of toroids. He has about 200 of them. Lets see if we can help him get rid of some and help you guys get a decent little toroid for each of your channels.
The toroids are 160VA and they have dual primaries with 24V each so this is near perfect for this project. So one per stereo kit will work but you will probably and most likely prefer two, plus that iwll allow you do go dual monoblocks which is always a cool bragging right.
I will do the group buy if we get 30 or more toroids.
The price at 30 of them is 22 dollars each plus shipping. Shipping will only be in the states and will be the price of a flat rate box.
Shoot me an email. If I get enough responses I will start a wiki. Who knows maybe we can start something here and get rid of all 200 for him.
By the way anyone can get in on this group buy for the transformers. I dont care if you bought amps or not.
Uriah
Attachments
Re: Toroid Group Buy
What are the benefits of two toroids vs one in a stereo kit?
udailey said:
What are the benefits of two toroids vs one in a stereo kit?
separate toroids with the implied separated secondary windings moves you towards pseudo monoblock for improved performance.
Re: Re: Toroid Group Buy
Less "crosstalk" between channels. Better channel separation for better imaging with the same VA worth of power.
You need to SIGNIFICANTLY increase the VA rating and capacitors to do what 2 small separate power supplies can do.
marc brown said:
Less "crosstalk" between channels. Better channel separation for better imaging with the same VA worth of power.
You need to SIGNIFICANTLY increase the VA rating and capacitors to do what 2 small separate power supplies can do.
Re: Re: Re: Toroid Group Buy
It is correct that there is potential for increased cross talk, but with caps and rectifiers and all other parts save for the toroid already separate that would not be something I would be concerned about.
In my mind (and different people will give you different answers to this), there is no real benefit to using two toroids in this design if you put everything into one case. One larger toroid is cheaper than two smaller ones.
If you are concerned about any possible crosstalk between the two (one might then debate whether you won't get more crosstalk from other issues...), then you should put them in separate enclosures (and of course then use a toroid each).
peter
Just to be sure Mark doesn't misunderstand. Each board has its own power supply. The only thing that would be shared is the toroid, which of course must be appropriately sized.troystg said:
It is correct that there is potential for increased cross talk, but with caps and rectifiers and all other parts save for the toroid already separate that would not be something I would be concerned about.
In my mind (and different people will give you different answers to this), there is no real benefit to using two toroids in this design if you put everything into one case. One larger toroid is cheaper than two smaller ones.
If you are concerned about any possible crosstalk between the two (one might then debate whether you won't get more crosstalk from other issues...), then you should put them in separate enclosures (and of course then use a toroid each).
peter
Absolutely correct. I was thinking in terms of a traditional pwr supply terms of Xformer / BR / caps separate from the amp PCB.
monoblock:stereo
A pseudo monoblock should be able to outperform a pair of amps sharing a common case and transformer.
Yes, a monoblock using the same components will always outperform a pseudo monoblock in a common case.schro20 said:
A pseudo monoblock should be able to outperform a pair of amps sharing a common case and transformer.
status: placing big orders today
Just wanted to give everyone a quick update. We have only a few outstanding invoices at this time and enough in the till to go ahead and place the big orders today.
A million thanks to everyone for coming through!
peter
Just wanted to give everyone a quick update. We have only a few outstanding invoices at this time and enough in the till to go ahead and place the big orders today.
A million thanks to everyone for coming through!
peter
20 toroids requested so far.
BTW I will be getting your kits shipped from Peter to me if you order a toroid. Then I will repackage and ship to you. You will save on shipping this way. I will divide the cost of shipping the mass amount of toroids plus Peter shipping to me amongst all those who buy a toroid and add it to shipping out the toroids. If that was all to confusing it will probably add a dollar to your shipping but you will only be paying for shipping of one package instead of 2.
Uriah
BTW I will be getting your kits shipped from Peter to me if you order a toroid. Then I will repackage and ship to you. You will save on shipping this way. I will divide the cost of shipping the mass amount of toroids plus Peter shipping to me amongst all those who buy a toroid and add it to shipping out the toroids. If that was all to confusing it will probably add a dollar to your shipping but you will only be paying for shipping of one package instead of 2.
Uriah
quadtech said:
Uriah,
So if my main is also 220V, I can't use the 160VA toroids?
If this is not true then I'll join the group buy.
Thanks.
I really think you would get a better deal if you bought the toroids in your own country. Shipping from here to there will be very costly after we add another 6 pounds of toroids to your order and the cost of these toroids is smaller then the next cheapest option in the US but not by a lot.
So my bet is that you can find a good alternative for about the same price after shipping.
This is a 120 in 24/24 out transformer. If you plug it into a 60Hz 120VAC socket you will get dual 24VAC primaries. Then tie together one wire from each secondary and you get 24/0/24.
This will not work with 240VAC.
Uriah
So my bet is that you can find a good alternative for about the same price after shipping.
This is a 120 in 24/24 out transformer. If you plug it into a 60Hz 120VAC socket you will get dual 24VAC primaries. Then tie together one wire from each secondary and you get 24/0/24.
This will not work with 240VAC.
Uriah
Will these work both here and overseas:
http://www.apexjr.com/images/AdireToroid.JPG
I have these at $19.95 each
Shipping overseas should be $15.00 by USPS Priority
Mail International Flat Rate Envelope. I can get up to
3 lbs at that cost.
Steve @ Apex Jr
www.apexjr.com
http://www.apexjr.com/images/AdireToroid.JPG
I have these at $19.95 each
Shipping overseas should be $15.00 by USPS Priority
Mail International Flat Rate Envelope. I can get up to
3 lbs at that cost.
Steve @ Apex Jr
www.apexjr.com
Apex Jr said:
The secondary voltage is on the low side.
You would have to adjust the resistors that feed the simple zener regulators on the RevC.
They also are a bit small on the current rating, but would be acceptable I guess for a single channel.
Cheers!
Russ
Thanks all for the input. I guess I will get it from Farnell locally.
I found some options that give 400VA 2x26V, is this ok for the amp? If you have the correct specs of the toroids (current and etc) please post here.
Thanks again 😎
I found some options that give 400VA 2x26V, is this ok for the amp? If you have the correct specs of the toroids (current and etc) please post here.
Thanks again 😎
for those of you that have never listened to a My Ref, you are in for a trat. I just assm. a set that I bought from Twisted Pear a year and a half ago. very very nice..
Hi My Name is Dominick and I'm an audio addict
Hi My Name is Dominick and I'm an audio addict
Guys/Gals
Wanted you to know that I have shipped the PCBs to Peter as of today. We bought the last caps today as well.
We had caps ordered from RELL but they backed out on us. WHAT? Yeah, they sold us the caps, then said they didnt actually have them. Anyway, found replacements today and bought them. They will be shipped to Peter tomorrow.
Peter has made a jig for labeling resistors. You try labeling 3000 resistors without something to help! 🙂 He has been labeling for a few days now. WOW, not my idea of a lot of fun.
Well, I have been waiting for my B1 board to get here. Really looking forward to driving a pair of MyRefC with that. Been doing some layout practice on just Plain Jane LM3886 amp board with some new software. Also working on a little board to turn an unbalanced signal to balanced and back again to unbalanced. WHY? Well because when it goes into balanced for that short time it will remove the junk noise that came in on the input line and I dont have balanced inputs or outputs on my equipment.
Other than that my Mollies wont stop having babies. I have over 3 dozen fry in a mini fish tank. Daughter thinks its great.
Uriah
Wanted you to know that I have shipped the PCBs to Peter as of today. We bought the last caps today as well.
We had caps ordered from RELL but they backed out on us. WHAT? Yeah, they sold us the caps, then said they didnt actually have them. Anyway, found replacements today and bought them. They will be shipped to Peter tomorrow.
Peter has made a jig for labeling resistors. You try labeling 3000 resistors without something to help! 🙂 He has been labeling for a few days now. WOW, not my idea of a lot of fun.
Well, I have been waiting for my B1 board to get here. Really looking forward to driving a pair of MyRefC with that. Been doing some layout practice on just Plain Jane LM3886 amp board with some new software. Also working on a little board to turn an unbalanced signal to balanced and back again to unbalanced. WHY? Well because when it goes into balanced for that short time it will remove the junk noise that came in on the input line and I dont have balanced inputs or outputs on my equipment.
Other than that my Mollies wont stop having babies. I have over 3 dozen fry in a mini fish tank. Daughter thinks its great.
Uriah
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