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What can i made from 2x55VAC 1000W toroidal transformer ?
What can i made from 2x55VAC 1000W toroidal transformer ?
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Old 14th November 2017, 07:20 PM   #31
asuslover is online now asuslover  Romania
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What can i made from 2x55VAC 1000W toroidal transformer ?
That's right.
I used edit again. No reason to argue here.

Last edited by asuslover; 14th November 2017 at 07:24 PM.
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Old 14th November 2017, 07:26 PM   #32
diyralf is offline diyralf
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Quote:
Originally Posted by AudioSan View Post
the point is: 2x55Vac sec transformer will give you around 375W average at 8ohm.
55x1.41=77.5Vdc rails. 77.5x0.707=54.8Vrms. 54.8x54.8/8=375W average at 8ohm and not 180W.
however. this is a teoretical ideal world. in the real world there will be some voltage loss. how much depends on the amp.
That's 60% true. But the transistors eat power too for the heat sink. I have an 150W amp that dissipates 50W into the heat sink.
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Old 14th November 2017, 07:36 PM   #33
AudioSan is offline AudioSan  Norway
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heat disipation got nothing to do with it. that do not change any voltage sving. it's the same calculation if its class A class A/B or class D or what ever.
the heat disipation is the result of consumed current at the given voltage by the outputs. and there is ofcourse a couple of volts lost in the outputs too.
i have a 25W amp that dissipates 125W at the heatsink at idle for each ch. but still, +/-24V rails still gives me 25W average at 8ohm.
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Old 14th November 2017, 07:36 PM   #34
leadbelly is offline leadbelly  Canada
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What can i made from 2x55VAC 1000W toroidal transformer ?
Quote:
Originally Posted by diyralf View Post
The 40% "lost" refers to the heat dissipation from the transistors not the transformer.
Why are you are you arguing? You are still wrong.

Quote:
Originally Posted by diyralf View Post
55VAC -> 55Vrms@1000W -> 55Vrails -> 55V/sqrt(2) = 38Vrms -> sqr(38V)/8ohm=180Watt rms
This calculation is simply wrong. If the transformer is rated for 55VAC at 1000VA then the rails can be +/- 76VDC. The output can be 54Vrms - active device headroom required, not 38Vrms. Don't ******** that you accounted for real world losses, those don't magically equate to sqrt(2).
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Old 15th November 2017, 09:33 AM   #35
diyralf is offline diyralf
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With 1000W load, your headroom is 54V. That means 54Vp for output. 54Vp means 38Vrms. Don't mix up peak and rms.
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Old 15th November 2017, 10:37 AM   #36
AudioSan is offline AudioSan  Norway
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like you do? its not 54V peak. peak voltage would be around 77V
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Old 15th November 2017, 12:20 PM   #37
AndrewT is offline AndrewT  Scotland
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nothing wrong with any 4year old Thread.

The rectifier passes the peak of the sinewave to the smoothing capacitors.
A dual 55Vac 1kVA transformer could have a peak voltage of around 124Vac on the bridge rectifier. That would give ~ 175Vdc across the two smoothing capacitors, i.e. +-87Vdc
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