The Lidström Lethal AMP -dead simple! :-) - diyAudio
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Old 17th November 2011, 10:25 AM   #1
tanker is offline tanker  Sweden
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Default The Lidström Lethal AMP -dead simple! :-)

After looking at all these funny amp projects with lamps, high watt resistors among others I decided to post this design idea.
-It can't be simpler! (meta Occam)

It is just an idea and will not work as is, you will need some bias resistors and maybe a cap here and there, but as a design idea it's fun.

If you do know what you are doing, go ahead and play with it.
-If you don't -stay away or die!!



Click the image to open in full size.
Ps. ZEN, burning amp, 300B and every tube design out there are all safer than this, stick to them if you don't know what you are doing...
 
Old 17th November 2011, 10:47 AM   #2
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Old 17th November 2011, 11:30 AM   #3
tanker is offline tanker  Sweden
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What?
-And I even put a fuse there...


 
Old 17th November 2011, 12:30 PM   #4
tinitus is offline tinitus  Europe
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constructing without mains isolation transformer is forbidden



moderation
 
Old 17th November 2011, 10:08 PM   #5
tanker is offline tanker  Sweden
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Ok, after reading the forum rules I see your point, I will behave...
(Even if the design itself is no different from the PFC part of a modern PC power supply, however unorthodox in audio)

Looking at the (somewhat clearer) schematic below, one can realize that the design is actually isolated from the mains using both in- and output transformers.

Click the image to open in full size.

I hope you are all still alive....
 
Old 18th November 2011, 12:02 AM   #6
tinitus is offline tinitus  Europe
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so, if modern switchmode supply is like this, why not use one, if thats all it takes ?

tho it appears to me that all switcmode supply do have 'isolation transformer'
 
Old 18th November 2011, 11:04 AM   #7
tanker is offline tanker  Sweden
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Now we are a bit off-topic...

In a typical "primary switched psu" all the active componets are on the primary side, without isolation, see picture below.
Galvanic isolation is done after the switching components. On the secondary side of the transformer there are only filter components.

You can build an audio amplifier this way, but it can be a bit dangerous if you don't know what you are doing, because you will have to put active electronic components on the (unisolated) primary side.

Building a large amplifier is a more complicated, you would have to put a PFC (power factor correction filter) on the input in order not to generate noise into the electric power lines feeding the amp.

In this case, building small ZEN like amplifiers that is not an issue...
Click the image to open in full size.
 
Old 18th November 2011, 12:21 PM   #8
tinitus is offline tinitus  Europe
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might be that its not so different from building your own switchmode

but there is one really important big difference

what you suggest is far more simple than building your own switchmode
and you know how it is with simple designs
they also attract the less skilled members
 
Old 18th November 2011, 12:29 PM   #9
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by tinitus View Post
constructing without mains isolation transformer is forbidden



moderation
'tanker' have been told kindly to make his design safe
and was allowed a second shot at it

no point in continuing this way
if you want to proceed with a safer version, please open a new thread

sorry to close it once again, but this will never be allowed
 

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