Reducing Voltage in a safe way.

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SkinnyBoy

SkinnyBoy

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Joined 2002
home.iprimus.com.au/jlstanley/Speakers/Index.html
anyone else have anything to say about 3 transformers in series? :) also... I have something of a voltage problem... heh... any ideas? 3 transformers..... all the same.. in series (assuming this will work) its 2 x 120V primary, 2 x 9V secondary 250VA.....any ideas to give me about +-30 to +-35 volts from three in series? :) THANX! my calculations say I'd get +-38 volts... perhaps I'll just use this.. :) THANX AGAIN!! lol I'll just try it with +-38 volts.. lol
 
djk

djk

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Joined 2001
darkm4n:

That amplifier will only do 200W/8R with ±40V supplies.

Just buy the recommended 32-0-32V 8A transformer.

Even if you had a fully regulated supply it couldn't deliver 350W/8R, even driven into saturation the outputs drop about 3V, and the emitter resistors also drop voltage, the drive circuit drops voltage, etc.
 
jan.didden

jan.didden

AX tech editor
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linearaudio.net
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Re: Ok .

darkm4n said:
So , if i do more 60 winding's it should reach the 32 value...??

Thanks
Click to expand...

You did 80 windings to get from 42 to 38. How many do you think will get you 60 windings? (Hint: It's 20 windings per volt. So 60 give you another 3 volts, you get 35 volts). And dont forget a liberal use of insulating tape between layers and on top!

Jan Didden
 
jan.didden

jan.didden

AX tech editor
Joined 2002
linearaudio.net
Paid Member
SkinnyBoy said:
anyone else have anything to say about 3 transformers in series? :) also... I have something of a voltage problem... heh... any ideas? 3 transformers..... all the same.. in series (assuming this will work) its 2 x 120V primary, 2 x 9V secondary 250VA.....any ideas to give me about +-30 to +-35 volts from three in series? :) THANX! my calculations say I'd get +-38 volts... perhaps I'll just use this.. :) THANX AGAIN!! lol I'll just try it with +-38 volts.. lol
Click to expand...


You do realise that the primaries have to be in PARALLEL right?

Jan Didden
 
M

markp

Member
Joined 2003
You are litterally playing with fire if you don't do it right!:hot:
Please buy another and save this one for another project or sell it to buy the other one.
As far as three transformers in a series, you must get the phasing right or you might have a problem(read bang).
 
SkinnyBoy

SkinnyBoy

Banned
Joined 2002
home.iprimus.com.au/jlstanley/Speakers/Index.html
markp said:
You are litterally playing with fire if you don't do it right!:hot:
Please buy another and save this one for another project or sell it to buy the other one.
As far as three transformers in a series, you must get the phasing right or you might have a problem(read bang).
Click to expand...


yeah.. I knew I had to get the phasing right.... not sure there will be a bang if I get it wrong... :rolleyes:
 
darkm4n

darkm4n

Member
Joined 2003
darkman.net4u.ro
Nope

darkm4n:

That amplifier will only do 200W/8R with ±40V supplies.

Just buy the recommended 32-0-32V 8A transformer.

Even if you had a fully regulated supply it couldn't deliver 350W/8R, even driven into saturation the outputs drop about 3V, and the emitter resistors also drop voltage, the drive circuit drops voltage, etc.
Click to expand...


I own a 500 VA transformer .
After my winding the aperadge of thea xformer drop ?
If i get it to 32 V - 0 - 32V i think it would be fine , unless the amperadge drop .. i really don't know

I can't find a 32 V x2 traf ..
 
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