[JN] magik ???
grego at sandesco.com
Tue Feb 2 23:03:16 CST 2021
Holy crap! some people have a lot of time on their hands.
How cool is that thing. I love it that he provided so much maker data.
It even has "cum holders"! Damn. It has auto-suck too
I'ld never leave the house...
On 2/2/2021 4:13 PM, Christian Rintelen via Sound wrote:
> so cool!!
> (just in case you’re tired of counting turns: here’s a DIY toroid
> winder with arduino control
> _ _ _
> aka christian rintelen
>> Am 02.02.2021 um 21:41 schrieb Hanski <hanskinposti at gmail.com
>> <mailto:hanskinposti at gmail.com>>:
>> Hi gents, my 2cents.
>> magnetic energy is stored in an air gap.
>> So if you need to store energy in a choke, you need an air gap.
>> Sendust like other powder cores have a distributed air gap (there is
>> always some air between powder particles).
>> Sendust is used in SMPS because it’s cheap and has lower magnetic
>> flux swing related losses than plain iron powder cores.
>> Usually they come in toroid shapes. One could also use a gapped
>> ferrite toroid there, but it’s usually a bad idea because you would
>> need to locate all windings on top of the air gap to cancel the
>> external flux (less outside flux, less EMC).
>> Other powder core materials:
>> P.S. I really like homemade audio transformers.
>> For small signal stuff one can use even plain SMPS ferrite. a few
>> thousand turns primary gives 200H inductance (Al = 12u) with commonly
>> available ferrite toroid. (No DC bias)
>> Just wound a couple with 50um thick wire. (My skills don’t go below
>> that, it’s already human hair thick) :)
>>> PS i’m not so sure Sendust would be that good for a transformer
>>> core. Sendust (aka Kool Mu) is often used in power supply chokes …
>>> because it stores energy well. is the capability to store energy
>>> better than other materials a good thing in an audio transformer? i
>>> don’t know (no irony). but i can imagine that the release of the
>>> stored energy «smears» the timing. isn’t the best core … an air
>>> core? because it does exactely the opposite — it doesn’t store any
>>> energy? (btw. Sendust has seen wide spread use in audio when tape
>>> and cassette recorders were still mass produced. many of the better
>>> recorders used Sendust heads because it is very hard.)
>>> _ _ _
>>> aka christian rintelen
> Sound mailing list
> Sound at soundlist.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Sound