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Re: Wellbrook traced-out loop amp schematics uploaded to Photos

 

Guys, as I mentioned I have a built and tested Wellbrook ALA1530LN Loop Amp and I have a few boards unpopulated. I also have boards on order. With my board layout you can't screw it up the feedback winding as they are marked RED and Green.
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Everett N4CY

In a message dated 7/23/2024 9:09:20 AM Central Daylight Time, dl4zao@... writes:
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The critical part is the phase relation between the the 1-turn feedback windings an the main secondary winding. With? the wrong phasehift, the negative feedback turns into an unwanted. positive feedback. There is one way to do it right, but there are three ways to do it wrong: upper winding wrong phased, lower winding wrong phased, both windings wrong phased.
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regards
Fred
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