Exactly

Exactly

Posted by Charles Hansen (M) on August 15, 2017 at 16:58:23

In Reply to: RE: Lower frequencies require larger transformers posted by John Elison on August 15, 2017 at 14:54:44:

All aircraft standardized on 400Hz to reduce the size and weight of magnetics many decades ago (I believe prior to WWII).

With today's technology that is what switching power supplies are all about. By increasing the operating frequency to hundreds of kHz, the transformer can be shrunk to incredibly small and light sizes. The drawbacks are the added circuit complexity, plus the fact that there is now a RFI generator built right into your electronics, with harmonics from the switching square waves extending up to the many tens of MHz and beyond.

The other advantage is that the transformer can have a mechanical buzz at over 100dB SPL, but you will think the unit is "dead silent" as you will never be able to hear it. (It may act as a bat deterrent.)

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Follow Ups Full Thread

Topic - How does incoming power supply frequency affect amplifier power output? - jeromelang 21:49:19 08/13/17 (17)

RE: How does incoming power supply frequency affect amplifier power output? - Schurkey 11:19:34 08/27/17 (0)

Lower frequencies require larger transformers - Charles Hansen 07:03:34 08/15/17 (13)

RE: Lower frequencies require larger transformers - PAR 02:06:39 08/16/17 (5)

RE: Lower frequencies require larger transformers - Charles Hansen 01:32:23 08/20/17 (2)

RE: Lower frequencies require larger transformers - PAR 02:35:45 08/20/17 (1)

RE: Lower frequencies require larger transformers - Charles Hansen 16:31:26 09/5/17 (0)

thanks, that was the thing I meant to ask Charles too - jeromelang 09:19:12 08/16/17 (1)

RE: thanks, that was the thing I meant to ask Charles too - PAR 15:12:37 08/16/17 (0)

RE: Lower frequencies require larger transformers - John Elison 14:54:44 08/15/17 (4)

Exactly - Charles Hansen 08/15/1716:58:23 08/15/17 (3)

RE: Exactly - pictureguy 00:06:38 08/27/17 (2)

RE: Exactly - Charles Hansen 16:37:57 09/5/17 (1)

RE: Exactly - pictureguy 17:10:56 09/5/17 (0)

RE: Lower frequencies require larger transformers - bare 09:45:44 08/15/17 (1)

Your source repeats my statement exxactly - Charles Hansen 16:52:26 08/15/17 (0)

It doesn't... - John Elison 19:15:03 08/14/17 (1)

Yeap it doesn't - airtime 12:42:46 08/15/17 (0)

Follow Ups

Exactly - Charles Hansen 08/15/1716:58:23 08/15/17 (3)

RE: Exactly - pictureguy 00:06:38 08/27/17 (2)

RE: Exactly - Charles Hansen 16:37:57 09/5/17 (1)

RE: Exactly - pictureguy 17:10:56 09/5/17 (0)

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