😯"oh no..Mr.Bill"hes got another transformer😂
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- เผยแพร่เมื่อ 11 ก.ค. 2024
- this power supply took two weeks to rebuild.it was originally built in 1992 in a houston satellite c band actuator box.there was much more I did to this,but videos would be too long.im giving this project overall, a 90% success rate.i set my standards pretty high.thanku for interest!😃
I used a agc 4amp on this transformer,because thats what i had.a agc 2 or 2-1/2 would have been a better choice.For those who didn't have American? TV in the late 70's,Mr.Bill was a clay figure that always got the $#!% beat outta him.the skit was part of the,live from N.Y...."Saturday Night Live" show..oh no!...Mr.Bill came just before they dropped a anvil on him or a car hit him.😂😂😂
really cool, interesting video as always!
Thanku🙂
I'm not exactly sure what the question is about the fuse. That transformer is rated for 144watts (18v*8A) so the current draw is 1.2amps. That's limited by the DC resistance, which doesn't change, and the reactance which changes with the current on the secondary, among many other things. A 4-amp rated fuse will last 3 seconds at 9 amps. Even with a full short circuit, I doubt that one variable alone will drop the reactance enough to make it draw anywhere close to that. That's over 1000 watts! Why not just put an ammeter on the primary and measure it?
There's no question.its just my way of presenting things.dont forget to factor in transformer efficiency in your calculations.have a great day.🙂
Is there any particular reason you're not using buck/boost converters to really easily give you the exact and precise voltage you want?
@@SkippiiKai that's a really good question.no there's not a reason.other than to say,I wanted this to stay same way it was in 1991.honestly, I haven't built a feed forward/ boost converter for years.its funny you mention that because today I was thinking about getting into them again.what would have helped a bit would be a ldo regulator,but i wanted to keep the old school appeal.lol..ive just started exploring ldo's today actually..they only require a fraction of a volt headroom for regulation.to sum it, I need to explore more current,lol,methods of doing stuff.ie,I gotta get with the times.😄thanku for comment😃
@@generalingwer4341 I get it. I always felt that buck/boosts were cheating, but when I realized I could get a 15-amp buck converter with very precise voltage control for $5 I decided I was okay with cheating!
On today's installment of Skippii recklessly tests your questions, I found an 18VAC transformer. No load idle: 0.02amps on primary. Secondary shorted: 1.2 amps on the primary; 7amps on the secondary@
Lol😃.your awesome and that's super intresting.im not sure I conveyed things well,but then my statement of,""" is there something in the magnetics of this transformer that's not allowing a high enough pri. Current(with shorted sec.)to blow fuse""was correct??that's what I see,my statement had truth to it..🙂 what u say plus what I saw aligns well...a four amp fuse was rather "strangely useless".i only used the four because I didn't have 2amp.my calculations set fuse value at 2amp,but seeing that there was 15,000 uf on rectifier,I would have leaned a bit higher.intresting that the other sec.winding ran,with another shorted🤔,that does make sense,but like you thought,it would have surprised me as well in the moment.you would make a "good detective". you may wanta try your hands at chemistry too.😄thanks for comment!
@@generalingwer4341 I guess it depends on what you mean and your perspective. A transformer is an inductor, and all inductors block AC. So I would say that's not something special going on. The "special case" would be when it *doesn't* do that. Like, if your AC input has a DC offset, that's a special case of magnetic stuff going on, where you can saturate the core and might be able to blow the fuse.
@@generalingwer4341
To get into the math a bit, my transformer primary has a DC resistance of about 22 ohms resistance. It uses 2.6w at idle/no load, which is 0.02amps (using Ohms law). Ohms law also says that I^2*R=watts, which gives us 6,000 ohms of impedance. Impedance is just the coil's DC resistance of 22 ohms + the reactance @ 60hz, so the normal reactance is 5978 ohms.
thanks for data🙂
@@generalingwer4341 BTW, today's prime day and they've got 20Amp buck converters on Prime for less than $5. Might save you a bunch of effort. ;)
Did it get hot?
@@kevinroberts781 lol.good question.no It's fine.temp all good!.the microwave transformer I tried was smokin' though😁.
A normal DC fuse won't blow with ac. That's why they use trip breakers.
What??? That's just wrong. A fuse will blow exactly the same between DC and the equivalent RMS current. It is literally the definition of RMS.