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Old 22nd October 2011, 11:00 AM   #1
Stee is offline Stee  Italy
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Default Transformer as Voltage Amplifier

my best sound scene
comes from a standard toroidal transformer 230V / 12V (500VA)
connected secondary as primary in 1:20 ratio
with a current amplifier used in current feedback control
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Old 22nd October 2011, 11:28 AM   #2
Elvee is offline Elvee  Belgium
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Current control + pure gap-less metal iron core must give an interesting coloration to the sound
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Old 23rd October 2011, 07:49 AM   #3
Stee is offline Stee  Italy
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Default IMPORANT known

the amplifier inverting input is used
disconnecting the internal feedback
See example on M9
Rf = RD 470R
Rs 0R33
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Old 23rd October 2011, 10:55 AM   #4
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Quote:
Originally Posted by Stee View Post
my best sound scene
comes from a standard toroidal transformer 230V / 12V (500VA)
connected secondary as primary in 1:20 ratio
with a current amplifier used in current feedback control
also an interesting approach. There are a wide range of different toroidal core materials - have a look to this thread:
DC Filter against humming Toroidals - Summary of the most interesting Comments

Perhaps the transformers, that make a loud buzz by DC components on the mains, are to prefer for such an approach.

Which influence to the sound are here to observe by the various core versions? That I want to know.
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Old 23rd October 2011, 04:06 PM   #5
Stee is offline Stee  Italy
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Default toroidal output

I am using a RS COMPONENTS

I think it's the power of 500 VA to make the sound quality
and of course the structure of the amplifier power (Jfet input)

correction (NFB) with the equalizer output shunt resistor
and breaks down the emphasis of primary

I assure you that the result is amazing
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