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Old 15th August 2008, 03:26 PM   #1611
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I know that...I just don't know if mine can run at 6 amps continuously. Probably not, if it need 9 amps peak. The article uses 1 transformer at 6 amps and 9 amps peak. I want to use 2- 6.67 amp tranfos for each channel. I'm not sure if it's cutting it close or not. Peak for how long?

That's all I wanted to know.

BTW- How do you know I didn't read it? Maybe I just didn't understand it.

If this is the way this forum is going to be...maybe you should just call it " Pass DIY for Elite Experts". Maybe I should just take a walk then.

thanks a lot.
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Old 15th August 2008, 03:35 PM   #1612
udailey is offline udailey  United States
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I think using two transformers with your ratings is going to be fine. If you look at the schematic in that last pdf it shows a dual primary dual secondary transformer which is pretty much what you have with your two transformers. Just wire it the same way as shown in the schematic. Your shouldnt have any problems with current and those two transformers seem to match the project very well.
Just my opinion. I have been wrong before, alot, but it makes good sense to me that you have essentially doubled your current capabilities.
Also, I am not trying to offend you. Maybe just moody right now.
Uriah
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Old 15th August 2008, 03:56 PM   #1613
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i have 660VA transformer with sec ouput 16.8V (10A) x 4

it give about 20V after rectifier and caps, can i use it to build Pass F5 ?
Pass F5 schematic show supply rail are +- 24V

thanks
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Old 15th August 2008, 03:58 PM   #1614
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Quote:
it give about 20V after rectifier and caps, can i use it to build Pass F5 ?
It's better to keep it loser to 24v, if you're using the schematic exactly as it is.

Vince
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Old 15th August 2008, 04:11 PM   #1615
udailey is offline udailey  United States
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It seems a little odd that you are only getting 20V.
Here is the transformer I have in my PS right now
1. Primary I = 0.02A, Secondary V = 18.4VAC at 0.0A, Power = 0 Watt
2. Primary I = 0.65A, Secondary V = 18.1VAC at 3.61A, Power = 65 Watt
3. Primary I = 1.20A, Secondary V = 17.7VAC at 7.08A, Power = 125 Watt
4. Primary I = 2.77A, Secondary V = 16.6VAC at 16.59A, Power = 275 Watt
5. Primary I = 4.00A, Secondary V = 16.4VAC at 24.11A, Power = 400 Watt

Its an Antek 400VA. Not that any of that matters. I get exactly 24V measured at the end of the caps. So what I am saying is that your 20V number seems low for your transformer but that your transformer has different ratings for different current draw and that you might just be testing it at very large draw. I dont know how you are testing it but 20V seems odd.
You should be getting around 23.8 which would be grand for the F5. However if you do some searches or read back through the posts people have tried lower voltages. Probably Zen has a schematic. I think he posted previously a schematic for lower supply voltages.
Uriah
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Old 15th August 2008, 04:13 PM   #1616
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Has anyone tried the F5 on batteries?
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Old 15th August 2008, 04:34 PM   #1617
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Quote:
Originally posted by udailey
It seems a little odd that you are only getting 20V.
Here is the transformer I have in my PS right now
1. Primary I = 0.02A, Secondary V = 18.4VAC at 0.0A, Power = 0 Watt
2. Primary I = 0.65A, Secondary V = 18.1VAC at 3.61A, Power = 65 Watt
3. Primary I = 1.20A, Secondary V = 17.7VAC at 7.08A, Power = 125 Watt
4. Primary I = 2.77A, Secondary V = 16.6VAC at 16.59A, Power = 275 Watt
5. Primary I = 4.00A, Secondary V = 16.4VAC at 24.11A, Power = 400 Watt

Its an Antek 400VA. Not that any of that matters. I get exactly 24V measured at the end of the caps. So what I am saying is that your 20V number seems low for your transformer but that your transformer has different ratings for different current draw and that you might just be testing it at very large draw. I dont know how you are testing it but 20V seems odd.
You should be getting around 23.8 which would be grand for the F5. However if you do some searches or read back through the posts people have tried lower voltages. Probably Zen has a schematic. I think he posted previously a schematic for lower supply voltages.
Uriah
sorry, i forgot to say its 20V under load
i think it should be arround 21V - 22V when no load.

now im using it to power up Pass aleph X.
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Old 15th August 2008, 04:34 PM   #1618
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by dfagerstone
Has anyone tried the F5 on batteries?

every one that did, now have a stack of flat batteries
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Old 15th August 2008, 04:37 PM   #1619
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by udailey

1. Primary I = 0.02A, Secondary V = 18.4VAC at 0.0A, Power = 0 Watt
5. Primary I = 4.00A, Secondary V = 16.4VAC at 24.11A, Power = 400 Watt

Its an Antek 400VA.
that's 12% regulation!!!!
very high for a 400VA transformer.
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Old 15th August 2008, 04:44 PM   #1620
udailey is offline udailey  United States
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http://cgi.ebay.com/18-18V-400VA-Tor...QQcmdZViewItem

Thats the link to the same transformer up for auction on ebay. I get nice performance out of it and it does measure 24V on the dot so it does the job well for me.
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