Interest in SumR 500VA 2x15V Transformer for F5X (ca. 100USD per Tx):
The Team 4 +
AndrewT 2
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.....
Please fill in accordingly.
Patrick
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The Team 4 +
AndrewT 2
.....
.....
Please fill in accordingly.
Patrick
.
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Interest in SumR 500VA 2x15V Transformer for F5X (ca. 100USD per Tx):
The Team 4 +
AndrewT 2
Horio 2
.....
.....
Please fill in accordingly.
Patrick
The Team 4 +
AndrewT 2
Horio 2
.....
.....
Please fill in accordingly.
Patrick
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Pls note that 1x 500VA will be sufficient for 1 channel F5X only or 2 channel F5 standard.
Price indication only and not including postage.
Patrick
Price indication only and not including postage.
Patrick
So we'll go and ask for 10 pieces.
I think that'll do for the first round. Some discount.
Not too much GB effort to divert the team from development work.
Patrick
I think that'll do for the first round. Some discount.
Not too much GB effort to divert the team from development work.
Patrick
For those who wants to support their local industry, here is an exemplary specification.
Patrick
Patrick
Please pardon my ignorance here, still catching up on the thread - why is a 500VA, 16A txr required for each channel?
If custom made, would 2 X 300, 400, etc VA units or one larger single unit, if space permits, do the job?
I generally use the EI core trannies, but are much larger (and expensive) than the T's.
If custom made, would 2 X 300, 400, etc VA units or one larger single unit, if space permits, do the job?
I generally use the EI core trannies, but are much larger (and expensive) than the T's.
Total dissipation per channel is 128W. Dropout loss in regulator or CRC 24W. Diode loss 16W. Min power requirement per channel = 168W. Factor of 3 to allow for high ripple current of Class A amp (see NP articles) = 504VA. Actually 0.8% undersized.
http://www.firstwatt.com/pdf/art_power_supplies.pdf
Case design has 350mm overall width. Conrad heatsinks 2x48mm. Some room for PCBs, wiring, etc, 2x50mm. Maximum width (diameter) of Tx = 154mm. Fits most commercially available 500VA Tx with about 5mm space left both sides.
Of course you can make your own decisions. That's why I said exemplary.
Patrick
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http://www.firstwatt.com/pdf/art_power_supplies.pdf
Case design has 350mm overall width. Conrad heatsinks 2x48mm. Some room for PCBs, wiring, etc, 2x50mm. Maximum width (diameter) of Tx = 154mm. Fits most commercially available 500VA Tx with about 5mm space left both sides.
Of course you can make your own decisions. That's why I said exemplary.
Patrick
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Hi there
I have been away for a while but not to far.
Enclosed copy of a first draft of the balanced F5 Triple
loads to do as make second half of pcb fatten & route tracks
Suply voltagge planed at 28V rails so components need sizing up
I have retained Nelson numbering.
AL
I have been away for a while but not to far.
Enclosed copy of a first draft of the balanced F5 Triple
loads to do as make second half of pcb fatten & route tracks
Suply voltagge planed at 28V rails so components need sizing up
I have retained Nelson numbering.
AL
Yes, but my experience is that you don't know what wire you get from them.
So I'd rather cut the enamel wire short and screw on a terminal block at the toroid, and use my own (normally silicon) wire from there.
If you want flexible wires we can ask whether he will do 2 of those as an exception.
Patrick
So I'd rather cut the enamel wire short and screw on a terminal block at the toroid, and use my own (normally silicon) wire from there.
If you want flexible wires we can ask whether he will do 2 of those as an exception.
Patrick
do remember that richard makes these custom, so if the perfect number is 504va, ask him for 504va, i'm sure he will do it for the same price
> do remember that richard makes these custom, so if the perfect number is 504va, ask him for 504va, i'm sure he will do it for the same price
I think I can also live with an over-rating factor of 2.976 instead of 3.000.
😉
Patrick
I think I can also live with an over-rating factor of 2.976 instead of 3.000.
😉
Patrick
I work from the other direction, and unsurprisingly arrive at the same answer.
The 500VA 16Aac transformer can supply 4Adc continuously using ~50% of it's maximum continuous capacity.
4Adc is sufficient to bias one channel of balanced F5x.
The 500VA 16Aac transformer can supply 4Adc continuously using ~50% of it's maximum continuous capacity.
4Adc is sufficient to bias one channel of balanced F5x.
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