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Old 9th December 2013, 07:49 PM   #721
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yea there's a great deal on that transformer but I want to be sure it'll work obviously.
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Old 12th June 2014, 02:00 AM   #722
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I really hope I am in a right thread. Hi Guys. I need help. 1/2 way building a spare Peter Daneils Premium kit. As been suggest the transfo secondary is 23-0 x 2 for this kit. I would like to push the output W higher, say to 50W above. What Secondary value V should I go for on the transfo? I have a spare Cyrus toridal at 29v x2. Can I use it? Tq guys!
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Old 12th June 2014, 08:42 AM   #723
AndrewT is offline AndrewT  Scotland
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What is the transformer's rated input voltage for that 29Vac output?
What is the transformer's rated regulation?

Then you can predict the maximum voltage, after the rectifier, when your mains is at maximum supply voltage.

We can't invent those numbers for you.
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Old 12th June 2014, 09:53 AM   #724
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Hi Andrew,

It was removed from Cyrus III. Input is

230- 0

Secondary is:

29v - 0v - 29v

7v - 0v

Looks like less hope? I see nothing written for the regulation. Supplied by Toroid Intl.Etd.

If this can't work, I have to custom 1.
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Old 12th June 2014, 11:06 AM   #725
AndrewT is offline AndrewT  Scotland
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you have a 230:29-0-29Vac.
You still need information for maximum mains supply voltage and for transformer regulation.

Maximum output voltage is :
maximum input voltage / rated input voltage * rated output voltage * {transformer regulation plus 1}

From there the peak voltage into the rectifier is sqrt(2) * maximum output voltage.

Maximum output voltage from the bridge rectifier is ~ peak voltage minus ~1V

Find the missing information.
Calculate the numbers.

Then from the datasheet see what the maximum supply voltage that is allowed.
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Old 12th June 2014, 02:22 PM   #726
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LM3875 Wide Supply Voltage Range: |V+| + |V
| = 20V
to 84V. Does this helps?

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Old 13th June 2014, 07:09 AM   #727
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by AndrewT View Post
..............
You still need information for maximum mains supply voltage and for transformer regulation.........................
That does not help.
Contact your Mains electricity supplier and ask them what the range of voltage for your domestic supply.

It is likely to be around 210Vac to 250Vac.

You need to contact your transformer manufacturer, or study the datasheet, for the transformer model you have and ask what is the transformer regulation.

Once you have these figures you calculate the maximum voltage as shown earlier.

If it exceeds the signal present maximum for the chipamp then you run the risk of blowing up your chip.
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Old 13th June 2014, 03:24 PM   #728
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Hi Andrew. Our domestic is 240v. Okie I try to search for the transfo spec and will catch up with you.
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Old 14th June 2014, 09:30 AM   #729
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by alfred wan View Post
........... Our domestic is 240v. ............
Your domestic supply varies.
of voltage depends on the supplier.
You need to ask them.

The minimum range is usually +-6%, some can be +-10%, It's even possible that your range could exceed +-10%.
ASK !
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Old 5th July 2014, 08:53 AM   #730
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Hi Andrew,

In fact I look for the tranny guy and custom according to original GainCard 170va x 2 and complete the amp couple days ago. Without worrying too much I do enjoy the Gainclone. Good news is it sound really special but bad thing is I prefer it to my Naim.

I borrowed a meter and plug into the outlet. In fact yes, the voltage varies. lowest show 212v and highest (at night) 230v.
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