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Old 29th August 2007, 03:49 PM   #1
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Default 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?
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Old 30th August 2007, 10:52 AM   #2
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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.
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Old 30th August 2007, 12:14 PM   #3
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I wonder what month it was published (the year doesn't matter)! Could it be around springtime (northern hemisphere) ?

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Charles
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Old 30th August 2007, 01:33 PM   #4
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This could be a possibility, but I suspect that Charles is more likely to be correct.
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Old 30th August 2007, 01:48 PM   #5
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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
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Old 30th August 2007, 01:55 PM   #6
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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.
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Old 30th August 2007, 01:59 PM   #7
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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
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Old 30th August 2007, 02:12 PM   #8
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Are those 130v rails I see?
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Old 30th August 2007, 07:57 PM   #9
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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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