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-   -   Switching amp without any active components (http://www.diyaudio.com/forums/class-d/107689-switching-amp-without-any-active-components.html)

hairylee 29th August 2007 03:49 PM

Switching amp without any active components
 
A while ago I came across an article in Electronics Weekly (I think) that had an old design for a switching amplifier. This design containd no transistors or active devices, just diodes, caps and transformer. Does anyone else recall seeing this and do they still have a copy of the design?

Pano 30th August 2007 10:52 AM

I'd love to see that! How do you do gain without active components? A transformer can do voltage gain, but you give up current.

Sure hope someone finds this novel idea.

phase_accurate 30th August 2007 12:14 PM

I wonder what month it was published (the year doesn't matter)! Could it be around springtime (northern hemisphere) ? ;)

Regards

Charles

pinkmouse 30th August 2007 01:33 PM

This could be a possibility, but I suspect that Charles is more likely to be correct. ;)

hairylee 30th August 2007 01:48 PM

After much searching around I found it by accident/luck whatever.. Here is a link. It wasn't in Electronics weekly afterall....
http://www.elecdesign.com/Articles/P...ArticleID=3979

djQUAN 30th August 2007 01:55 PM

I have also seen that in an electronics mag (1960's) and it showed a different schem but the same 4 layer diodes are used.

I remember it uses an input and output transformer and said it can be scaled up to 1kW.

phase_accurate 30th August 2007 01:59 PM

Aaaaaaah FOUR LAYER diodes !!! These ARE active devices IMHO.
This is an interesting circuit from the technical point of view. From the perfomance- and economical- points of view it isn't, unfortunately.

Regards

Charles

theAnonymous1 30th August 2007 02:12 PM

Are those 130v rails I see?:eek:

Pano 30th August 2007 07:57 PM

Clever stuff!

Pink Mouse, thanks for the link to the Mag-Amps. Had forgotten about those. I've seen the circuit used for dimmers. Big iron!


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