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Old 27th March 2008, 11:21 AM   #1
gionag is offline gionag  Italy
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Default what kind of transformer for a Z#9

hi guys,
i'm building the PS for the ZenV9. What kind of toroid i have to use ?

Mr.Pass, had used a 300VA 18x2V, But i seen guys who had used a 35x2V or other voltages.

With the original unregulated ps Board, what transformer can i choose ?

Thanks !
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Old 27th March 2008, 11:25 AM   #2
steenoe is offline steenoe  Denmark
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The answer is both The 2x18 secondaries are used in series which equals 1x36V. The 35V secondaries are used in parallel (or one for each channel) The end-result is roughly the same.



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Old 27th March 2008, 11:28 AM   #3
gionag is offline gionag  Italy
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....

i'm an idiot ! i'm thinking about only SERIES, not PARALLEL

for the parallel, i still use a 300VAC ?


Thanks a lot i'm a n00b
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Old 27th March 2008, 11:39 AM   #4
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by gionag
....

i'm an idiot ! i'm thinking about only SERIES, not PARALLEL

for the parallel, i still use a 300VAC ?


Thanks a lot i'm a n00b
I guess you can do it with a single 300VA (it doesnt matter if its the 2x18V or the 2x35V) If its a good quality unit it should be ok. I am using two pcs 2x18V, 300VA's in mine.



n00b's are very welcome
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Old 27th March 2008, 11:45 AM   #5
gionag is offline gionag  Italy
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i can't find anyone selling a 2x18V 300VAC trasformer.

Where i can look ?

Thanks a lot
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Old 27th March 2008, 12:25 PM   #6
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by gionag
i can't find anyone selling a 2x18V 300VAC trasformer.

Where i can look ?

Thanks a lot
Maybe someone closer to you can answer that Most electronic suppliers, carry toroid's.
Buying two of those with 2x18V secondaries is a very good choice.
You can build many of the Pass amps with such a pair. Almost all of the PassDIY and F amps use them



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Old 28th March 2008, 12:23 PM   #7
gionag is offline gionag  Italy
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another think.

the 300VA transformer is for both channels or a 300VA toroid each channel ?

If i'm right, Mr.pass, use a CCS in the zen #9 and the current is fixed to 2A, then a good toroid for ONE channel is 36 Volt X 2 Ampere = 72VAC.

It's true ?

thanks a lot
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Old 29th March 2008, 11:28 AM   #8
gionag is offline gionag  Italy
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ahem, excuse, maybe i was too confusing in my explanation:

I need to know how much VAC i need for each channel...
it's better 1 toroid of 300VAC, or is enough 1 toroid of 150VAC per channel ?

(i don't want to use a single transformer for both channels)


Thanks a lot
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Old 29th March 2008, 12:36 PM   #9
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VAC = alternating current voltage
VA = voltage times current ~power

Rail voltage of the V9 is 50 volts, 36Vac rectified.
2 Amps times 50 volts = 100 Watts.
150VA works, but is not advisable, a 225VA would be the minimal transformer value.
300VA is more common, price difference between a 225VA and a 300VA transformer is not worth the saving.
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Old 29th March 2008, 06:59 PM   #10
gionag is offline gionag  Italy
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perfect,
i've just order two toroid of 300VA / 36-0V @ 8.3A.

It's right ?

thanks to all
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