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Stupid question about voltage
Stupid question about voltage
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Old 22nd August 2008, 12:53 PM   #1
jeppix is offline jeppix  Italy
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Default Stupid question about voltage

Hello to everybody

I need an help... probably it's a stupid question but I need some advice.

I've a circuit that has two output +80V DC and -80V DC it is possible to split every output?
For example with the +80V it's possible to have 2 x +40V and from the -80V have 2 x -40V?

Thanks and sorry for the, probably, stupid question.....

Andrea
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Old 22nd August 2008, 01:15 PM   #2
richie00boy is offline richie00boy  United Kingdom
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Stupid question about voltage
Probably not. It depends on what level of isolation you require and how much current you want and how complex you are prepared to make it.
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Old 22nd August 2008, 03:33 PM   #3
sreten is offline sreten  United Kingdom
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Hi, I think the short answer is it is not easily possible, /sreten.
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Old 22nd August 2008, 03:39 PM   #4
lineup is offline lineup  Sweden
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Default Re: Stupid question about voltage

Quote:
Originally posted by jeppix
Hello to everybody

I need an help... probably it's a stupid question but I need some advice.

I've a circuit that has two output +80V DC and -80V DC it is possible to split every output?
For example with the +80V it's possible to have 2 x +40V and from the -80V have 2 x -40V?

Thanks and sorry for the, probably, stupid question.....

Andrea
yes, was a stupid thing to ask

But I have seen much more stupid things, than this,
from supposedly real clever Audio Electronics Engineers
So called EE jetset members - almost gurus, very educated.

we can say, if you are stupid in your plain asking,
you are in very, very good company

hehe, hehe hehe
haha, haha
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Old 22nd August 2008, 04:30 PM   #5
momin is offline momin  Sudan
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i dont think that there is stupid questions.
any way if u have an access to ground, u can use voltage divider technique to split this voltage. all u need is two identical resistors.
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Old 26th August 2008, 09:43 AM   #6
acid_k2 is offline acid_k2  Italy
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Quote:
Originally posted by momin
all u need is two identical resistors.
better, all you need is 2 identical loads in series. This is normally difficult to obtain.
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Old 26th August 2008, 11:16 AM   #7
lineup is offline lineup  Sweden
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Better buy two transforners.
They are not very expensive.
Not the smaller ones.

Then you can get yourself any voltage.
2 x 40 + 2 x 40
.. and whatever else, my friend.

Sometimes, using tricks to get a lower component number,
is very stupid. Even for DIY Audio. Even for KISS = Keep it simple stupid.

Few parts. Low cost.
Sometimes will complicate things so much and make your cicruits perfom bad.
And this is not what you want .. is it
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Old 27th August 2008, 11:00 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
a resistor divider with multiple taps will give multiple output voltages.
But, if the current from any of the taps changes the voltages on all the other taps will also change.

A multiple secondary transformer would achieve most of what you require, but sourcing it will not be easy nor cheap.
A home re-wind of a toroid with multiple secondaries is very possible at little cost.
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Old 1st September 2008, 08:51 AM   #9
Karakacha is offline Karakacha  Kenya
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Default power supply

please Mr,
Though it might make little impact but would assist basing on your knowlege in electronics.
just wind a centre tapped transformer[-80v_0_+80v] or get 160vdc then get 2resistors [equal values] connect them in series across the 160vdc. at the centre of the resistors connect it to 0v at the top from centre you have +80v and bottom -80vdc.
please use reasonable power value reasistors.
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Old 1st September 2008, 09:16 AM   #10
jan.didden is offline jan.didden  Europe
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But the load current will also go through the resistors. If you have a load connected to the 0V point, the current through the load has to go back to the transformer end via the resistors. That will cause a drop of voltage across the resistor of load current * resistor value. This will unbalance the setup, and at one end your voltage will greatly rise above the 80V and at the other side it will collapse toward zero.

This will ONLY work if you have very small load currents and very low resistor values. Not for audio amps.

Jan Didden
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