Post AvAsvK1doFYRbKJ8fg by profdc9@mastodon.social
 (DIR) More posts by profdc9@mastodon.social
 (DIR) Post #AvAkNLNTTbmCJco6EK by Ricardus@mastodon.sdf.org
       2025-06-16T01:19:14Z
       
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       I just found my bi-polar SMPS power supply that I bought for an audio project. A friend also designed a filter board to remove the high-frequency noise generated because it is a switching supply.#Electronics #SMPS #Audio #PowerSupply
       
 (DIR) Post #AvAsvK1doFYRbKJ8fg by profdc9@mastodon.social
       2025-06-16T02:55:00Z
       
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       @Ricardus In my amplifier project, I designed a very overdone power supply filter board to take out switching noise and RF.https://github.com/profdc9/PowerAmpAudio/tree/master/PowerCond
       
 (DIR) Post #AvClPoGrVl5YmBNEmm by Ricardus@mastodon.sdf.org
       2025-06-17T00:40:20Z
       
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       @profdc9 Tell me more about this amp.
       
 (DIR) Post #AvCu5RLfvRp9TmzFZI by profdc9@mastodon.social
       2025-06-17T02:17:28Z
       
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       @Ricardus It is a Class AB 300-400 W audio amplifier.   There are detailed instructions at:https://www.github.com/profdc9/PowerAmpAudioIt has the amplifier itself, a board for a balanced to unbalanced input, a power conditioning board, and a soft start board (to prevent transformer current inrush).  It's designed to have flexible part substitution which is detailed in the documentation.
       
 (DIR) Post #AvCuAuyjBpUSp4rj0K by Ricardus@mastodon.sdf.org
       2025-06-17T02:18:29Z
       
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       @profdc9 Awesome. How does it test for harmonic distortion and such?
       
 (DIR) Post #AvCuEamYDnDvLKvDg8 by profdc9@mastodon.social
       2025-06-17T02:19:06Z
       
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       @Ricardus Very good, less than 0.1% at full power and 20 kHz, much less at normal power and more audible frequencies.
       
 (DIR) Post #AvCv3zYDtIQEvnjHJQ by Ricardus@mastodon.sdf.org
       2025-06-17T02:28:18Z
       
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       @profdc9 I just grabbed the Gerbs for the power amp proper to have a look. Maybe I'll build one in the future.
       
 (DIR) Post #AvCwANG4lDEw9Lqega by Ricardus@mastodon.sdf.org
       2025-06-17T02:40:44Z
       
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       @profdc9 Do you have any pics of your build?