What amp could I build with 600VA 2x61V AC transformers?

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#21
The LM4780 claims (in the datasheet) to take 20V to 84V, so I guess that's always an option.

So my hunch about rectifying the same pair twice in each direction makes sense? I'll have to draw it out to see it I guess..

But in conclusion, it's either much too high for any discrete amp, or slightly on the low side?

I could buy 3 and build a 6 channel (5.1 surround) lm4780 chipamp? could be interesting but I get the feeling I'm solving problems that don't exist 😛
 
#22
Tinco said:
The LM4780 claims (in the datasheet) to take 20V to 84V, so I guess that's always an option.
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You should keep in mind that these are the absolute limits. There are additional restrictions on using the IC at a high voltage differential (Vcc-Vee). For instance you would need a larger heat sink and could only operate with 16 ohm or higher loads connected to each channel. Mains voltage fluctuations e.g. higher than average mains voltage becomes a big concern.
 
#23
Tinco said:
Hey guys,

Hypex is over stocked on some transformers, and is selling them with a steep discount. Especially this one looks very interesting to me:

http://www.hypex.nl/docs/TR700_datasheet.pdf

It's 600VA, with dual 0-61V AC secondaries at 50 euro.

I am looking to do a nice high end amp for my next project and was thinking of either a Leach or the Honey Badger, but I'd usually pay double that price for half that VA, and transformers are the most expensive part usually.

Now 120VCT is a crazy amount, are there any amps that run on -/+85V DC that I could build?

I know the LM4780 does according to the datasheet, but I'm not sure if it's a good idea, and I've already built a chip amp and would like to try out something more complex.

Alternatively they also have 120VA transformers at 20 euro, also a good price, but they'd have to be parallel for any decent setup, and rectifier bridges aren't free either.



What would you guys do?
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Do you have a link to where those transformers are being sold?
 
#27
Tinco said:
The LM4780 claims (in the datasheet) to take 20V to 84V, so I guess that's always an option.

So my hunch about rectifying the same pair twice in each direction makes sense? I'll have to draw it out to see it I guess..

But in conclusion, it's either much too high for any discrete amp, or slightly on the low side?

I could buy 3 and build a 6 channel (5.1 surround) lm4780 chipamp? could be interesting but I get the feeling I'm solving problems that don't exist 😛
Click to expand...
84V is less than +-45V (=90V).
Read the datasheet !!!!!!!!!
 
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