Audio Isolation Transformer Class-T Power Amplifier

[@friedmule5403]

Thanks for making one of the best videos on the subject!! I just have to subscribe, even if all future videos should only get half as good!! :-)

[@KissAnalog]

LOL - I’ll take it!! Thanks for the great compliment! I do hope to get better so I’m open to all suggestions;)

[@friedmule5403]

@@KissAnalog I have worked with audio / video recording, manipulation, editing and as a (non electronic)-technician in local and national radio and TV so maybe I can be of little help if you one day have a question. :-)

[@KissAnalog]

Fried Mule that would be great - thanks! Any suggestions and/or ideas are welcome!

[@frankcharlesworth4580]

The 100kHz inductance measurements were milliHenries not Henries. This is what I would expect for the permeability of audio core materials.

[@amithshaw6240]

Very nice and competitive distinguish. Well done 👍🏻

[@KissAnalog]

Thank you - I appreciate you!

[@adaml52]

Hi Eddie, Why have you tested at 2v p-p ? Isn't the audio line level nominally 1v p-p ? Good video. Adam

[@KissAnalog]

Thanks Adam - and great question! I think the peak for pro studios is 1.23V, and consumes 0.316V But I think a common max is 2Vrms now. I used s high value so to test the transformer for saturation to be sure it was robust, I need to do a video on this subject as a foundation for audio work to come. Thanks for bringing this up!!

[@adaml52]

@@KissAnalog Thanks Eddie, I learned something new from you, my experience of line levels came from installing car audio amplifiers as teenager.(late 1980's) For friends, always saw the 1V p-p reference on the amplifiers input. As a friend tried to directly couple his new amplifier to the speaker outputs of his car stereo, which ended badly. Not in to Audio, never really that interested, now we have cheap modules from China, it's raised my interest. As for driving it to saturation, what's the point ?, you wouldn't do that to a transformer in a linear power supply circuit. May be test the insulation of the windings, with an insulation resistance tester like a Megger ?. Adam

[@KissAnalog]

I’ll show how to test and design your own magnetics. You have great insight - I’ll demonstrate a HiPot meter I just picked up. ;)

[@adaml52]

@@KissAnalog Hi Eddie, Just had to look up what a hipot meter is.😎 Very similar to the PAT tester at work, generates high test voltages for insulation resistance testing and high current for Earth bonding. I'm guessing that it's a Fluke or Seaward ?

[@versace885]

Hi Eddie, that was sure a cool video thanks a lot

[@43vl]

I think you need to provide a load on the secondary for the transformer to work as specified. The scope is not sufficient.

[@KissAnalog]

Thank you for this feedback. I think you are right - loading does help make a difference;)