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Old 3rd July 2012, 08:03 PM   #31
mattmcl is offline mattmcl  United States
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What would be suitable Antec transformers to use when building this dual mono?
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Old 4th July 2012, 08:30 AM   #32
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Quote:
Originally Posted by mattmcl View Post
What would be suitable Antec transformers to use when building this dual mono?
Maybe these?
AN6440
39.9vac, 3.6a, 144w nom
39.2vac, 7.4a, 289w max
(39.2+39.2)*7.4 = 580va
.
AN6445
44.7vac, 3.3a, 146w nom
43.7vac, 6.4a, 278w max
(43.7+43.7)*6.4a =559va
.
AN5440
40.4vac, 3.0a, 122w nom
40.0vac, 6.0a, 240w max
(40.0+40.0)*6.0 = 480va
.
AS4445
43.8vac, 4.5a, 195w nom
43.2vac, 5.5a, 232w max
(43.2+43.2)*5.5 = 475va
AN4442
42.3vac, 2.4a, 103w nom
41.9vac, 4.4a, 185w max
(41.9+41.9)*4.4 = 369va
AN3245
45.2vac, 1.8a, 81w, nom
44.2vac, 3.3a, 143w max
(44.2+44.2)*3.3 = 292va

The secondaries in parallel data was divided by 2 to get the above estimates for split rail amplifier use. There's a variety of considerations when selecting transformers but speaker load seems especially important. What is your speaker load? Do you intend to use stealth, shottky or silicon rectifiers? Do you intend to use a CRC or C,R//D,C power supply or not? Will you be using a mains fuse? Do you have interest in running the amplifier at near full blast for long durations or do you plan to use a fraction of the amplifier's power most of the time? Will you be using dual mono with 2 transformers or virtual dual mono with 1 transformer with or without a CRC? Will you be using a speaker jack fuse? And, I'd sure like you to double-check my estimated transformer current figures before purchase.
Click the image to open in full size.
Some voltage notes: If you wanted 60vdc rails, Antek has one that will do it natively, the AN4442--with KBPC3502 and some caps gets the target voltage simply. For the AN**45 you might like a CRC, CDC or similar power supply (or if you're using a stealth rectifier) to waste the couple extra volts (perhaps waste some noise as well) and get you back down to 60vdc rails. Transformer voltage figures are given with 120v mains voltage, but if that varies, so will your transformer output.
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Last edited by danielwritesbac; 4th July 2012 at 08:33 AM.
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Old 4th July 2012, 02:51 PM   #33
mattmcl is offline mattmcl  United States
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Wow, thanks. My speakers are 6.5ohm, about 87db.

I'm not sure on the rectifiers, I don't know the differences. Same with your questions on CRC or C,R/D,C- not sure what that means.

I will definitely be using a mains fuse. Probably will run the amp at low to mid volume for short periods of time.

I would like to build it dual mono with two transfos.

No on the speaker jack fuse, but I will be incorporating the soft start and speaker protection circuits offered in the store.
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Old 4th July 2012, 03:17 PM   #34
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Originally Posted by mattmcl View Post
Wow, thanks. My speakers are 6.5ohm, about 87db.
Probably will run the amp at low to mid volume for short periods of time.
I would like to build it dual mono with two transfos.
It seems there is a Ferrari going to the grocery store (more amp than speakers), but that's okay! You won't have clipping.
I've got a couple more questions:
Is the 6.5 ohms measured by ohmmeter?
Are the speakers 2 way or 3 way design?
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Last edited by danielwritesbac; 4th July 2012 at 03:31 PM.
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Old 4th July 2012, 03:25 PM   #35
mattmcl is offline mattmcl  United States
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No, I have not measured with an ohmmeter, but they are Short Thors and many here have built them. I'm assuming mine are equal to what others have tested.

They are MTM, 6.5" woofer, tweeter, 6.5" woofer.
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Old 4th July 2012, 03:39 PM   #36
SoIL4x4 is offline SoIL4x4  United States
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Matt, my speakers are AMT monitors which have very similar specs to yours and I am planning on using a pair of antek AS4445 transformers for a dual mono configuration. That will provide a rail voltage of +-64V. I assume you are using the DIY store power supply boards also? If so you will have to watch the operating voltage of the caps you choose.


My requirements of this amp seem similar to yours.

Daniel. Are you saying you don't grocery shop in a ferrari?
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Old 4th July 2012, 06:13 PM   #37
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Quote:
Originally Posted by mattmcl View Post
No, I have not measured with an ohmmeter, but they are Short Thors and many here have built them. I'm assuming mine are equal to what others have tested. They are MTM, 6.5" woofer, tweeter, 6.5" woofer.
Okay, diyaudio.com member Currentflow pointed me to the answer to my voltage question here: diyAB Amp - The "Honey Badger" in that post by OStripper.

So, it is possible to use a 28+28vac transformer just fine. It is going to make about 42vdc rails. That is enough to X-Max most or many 8" and smaller woofers. More to the point clear vocals don't come out of madly shaking woofers of maxed out 2 way speakers. Thus the lesser transformer is probably enough voltage if you have 2 way speakers. It simply makes a smaller scale amplifier. You can "right size" if you want to.

What it means to me is that this opens up more possible transformer selections, much of which is less expensive in some way. With the 28+28vac transformer, the caps can be inexpensive 63v models, and you can use double-parallel output with less ballast resistor loss and less expense which is something to consider if your speakers didn't happen to need a super power amplifier.

Not everyone has speakers capable of handling or doing anything useful with 150 watts and therefore not everyone needs 60+60vdc rails, and then maybe not everyone needs the price tag for extra power not used.

At least we have a transformer voltage range: 28+28vac to 45+45vac or anywhere in-between.
Quote:
Originally Posted by SoIL4x4 View Post
Daniel. Are you saying you don't grocery shop in a ferrari?
I would do that more expensive approach if there was future plans to upgrade the power handling of my speakers. With a 150w amplifier, of course the upgrade speakers would be 3 way or more so that the vocals didn't get scrambled/shaken when the amplifier was run all the way to its maximum potential.
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Last edited by danielwritesbac; 4th July 2012 at 06:19 PM.
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Old 7th July 2012, 11:17 AM   #38
naf is offline naf  Indonesia
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found discrepancy in DiyAB Build Guide,
schematic say C4 = 0.1uf, BOM say 220uf non polar (voltage rating ??)
schematic say C3 = 220uf, BOM say 100nf (0.1uf) 35-50V
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Old 8th July 2012, 02:56 PM   #39
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Quote:
Originally Posted by naf View Post
found discrepancy in DiyAB Build Guide,
schematic say C4 = 0.1uf, BOM say 220uf non polar (voltage rating ??)
schematic say C3 = 220uf, BOM say 100nf (0.1uf) 35-50V
C3 paralel with C4, so it,s Ok...rating c3=c4
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Old 8th July 2012, 03:26 PM   #40
naf is offline naf  Indonesia
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Originally Posted by danzrose View Post
C3 paralel with C4, so it,s Ok...rating c3=c4
Thanks mas Danz, but in layout overview it's correct C4 is NP Cap.
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