Floating Transformer Technology

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#23
I have a book, which contains one power amp, use FTT.
The trick, is to use the floating PSU only for the output stage of the class "A" amplifier, but the VAS can use the fixed power supply. With this solution You can put the feedback back to the input.
The best result of this technology to decrease the wasted power caused by the high bias.

Sajti
 
#25
Floating Transformer Technology "FTT" is a term for NOT connecting the connection point of two windings of the power transformer directly to ground.

So it really means the transformer is not connected directly to ground.

Instead you use one bridge and capacitor for each winding of the transformer, and then you conect the minus of the top bridge to ground and the plus of the bottom bridge to ground.

Then you have got a -V ground +V supply.

This is of course nothing new, and has been used for many years by a lot of manufacturers without any special name.
 
#26
I have to scan it, from the book.

This is very simple amplifier using opamp, to drive BJT output stages, and put out some 15W/8ohms. Both opamps, and the "B" class output stage use +/-15V, and the class "A" output stage use +/-4V psu floating on the output of the "B" class amp.

Sajti
 
#30
quote---------
3 years ago, a "Floating Transformer Technology" was introduced, which we called FTT. This technique gave us a more linear supply with higher current capability and lover impedance. Capacitors were selected for their impedance behavior versus frequency and not for their physical size.
We also found the amount of capacity must match the type of design, one can not just throw in a bunch of capacitors. This is a case where often, "less is more".
FTT is used in _all_ of our _pre_ and _power_ amplifiers.
quote---------

could you imagine something like "New Class A" everywhere?
 
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