lm4780 Dual mono kit from audiosector?

Nickzz · 9th March 2006, 07:39 PM

How many volts can i put in to the lm4780?
I found a transformer with 400VA and 42volts does it works?

If you built this kit your self!
please put up some pictures!

Greg Erskine · 9th March 2006, 08:04 PM

Hi Nickzz,

It is really worthwhile having a look at the LM4780 datasheet, one can be found here: http://www.datasheet4u.com/html/L/M/...uctor.pdf.html

It says maximum voltage is 84V i.e. 42-0-42 VDC.

If your transformer is 42-0-42 VAC then after rectification through a bridge the DC voltage ends up approx. 42 x 1.4 = 59 ouch.

If you need to use this transformer then you can't use a bridge rectifier.

regards

dfdye · 10th March 2006, 01:32 AM

If the transformer is 42VCT, then you can use the +/-21V and be right in the sweet spot with ~+/-30V.

Mmmmm. . . . . . Sweet. . . . . .

If it is just +42V, then you will have a little more work to do, and will probably either need to use a different transformer (unless you want to do some surgery on it!)

I think we just need a little more info on the transformer to really say if it will be useful.

9th March 2006, 07:39 PM	#1
Nickzz diyAudio Member Join Date: Mar 2006 Location: Mölndal	lm4780 Dual mono kit from audiosector? How many volts can i put in to the lm4780? I found a transformer with 400VA and 42volts does it works? If you built this kit your self! please put up some pictures!

9th March 2006, 08:04 PM	#2
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	Hi Nickzz, It is really worthwhile having a look at the LM4780 datasheet, one can be found here: http://www.datasheet4u.com/html/L/M/...uctor.pdf.html It says maximum voltage is 84V i.e. 42-0-42 VDC. If your transformer is 42-0-42 VAC then after rectification through a bridge the DC voltage ends up approx. 42 x 1.4 = 59 ouch. If you need to use this transformer then you can't use a bridge rectifier. regards __________________ Greg Erskine

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10th March 2006, 01:32 AM	#3
dfdye diyAudio Member Join Date: Dec 2005 Location: USA	If the transformer is 42VCT, then you can use the +/-21V and be right in the sweet spot with ~+/-30V. Mmmmm. . . . . . Sweet. . . . . . If it is just +42V, then you will have a little more work to do, and will probably either need to use a different transformer (unless you want to do some surgery on it!) I think we just need a little more info on the transformer to really say if it will be useful.