what kind of transformer for a Z#9

[gionag]

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 !

[steenoe]

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.



Fast answer, ehh?

[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

[steenoe]

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

[gionag]

i can't find anyone selling a 2x18V 300VAC trasformer.

Where i can look ?

Thanks a lot

[steenoe]

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

[gionag]

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

[gionag]

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

[jacco vermeulen]

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.

[gionag]

perfect,
i've just order two toroid of 300VA / 36-0V @ 8.3A.

It's right ?

thanks to all