I know what I want, but I can't find any parts. Maybe you guys can help:
I need to take power from a wall unit and make it DC, now the problem is that I can't have waving. SO I need a voltage regulator!
I can't find a good place that sells a rectifier OR a voltage regulator.
But once I have those, I can just use 2 step down transformers in parallel to get a 12 V line and a 30 V line.
Any help?
1) I mean wall wart sorry.
2) In the first link the 2 A is fine I believe (the less amps the BETTER)
3) As much time as it takes, and I am not super worried about money. It's my senior project
4) ALL the parts in the second link schimatic... I just need to make it to plug into a wall wart
Also, again your wrong with the amps, LESS amps in a flyback driver is better. HIGH voltage, LOW amps.... it works better that way.
Your a sexy man, Torben!
Nah, just measure or assume internal impedances, figure your load amps and if this arrangement will ever be open-circuited, get it to work on paper first maybe with current sharing resistors, and you're done.2 wall warts in parallel? I see the smoke comming...
Nah, just measure or assume internal impedances, figure your load amps and if this arrangement will ever be open-circuited, get it to work on paper first maybe with current sharing resistors, and you're done.
Torben -
1) I think the 25.2 VAC transformer was chosen for a reason and is fine; and
2) Where do you intend to attach your wall warts? Can you draw that on your schematic and post it?
3) Why do you think C8 needs to change?
1) But the second schematic I showed you needs 30V
2 + 3)
SO I did mucho grande research, and it turns out:
Power Supplies
I should use a 5500uF (I will be using a 5600uF due to price)
in parallel with a MC33167 (switch regulator, VERY efficient and reliable)
(oh and these puppies are capable of stepping up voltage!)
I will post a schematic of everything I will be doing soon.... I would really dig you guys reviewing it and grabbing the concept, seeing if what I am doing is not wrong(I am a senior that is going into EE, I have already taken MANY electrical classes at a community college though)
Now, you said that I can't use a transformer to produce 30V?
edit - reading Torbans post a second time (sorry it seemed all jumbled together... no "paragraphs".)
It turns out that it will end up having 34? And thats ok on the 30V line? HMMMMMMM... I obviously need to study transformers MORE.
edit2 - Haha, read it a third time (I am sooo A.D.D. sometimes at night/tired ) and you said the top part will be 100% fine for the main flyback driver? Even though the second part does not have a regulator?
Haha, thats no what I was saying. I was talking about a spacific paragraph that looks gumbled to ME. Reading on a forum and reading a book are 2 seperate things, and personally I find a 1280×720 at night when I am tired is just a pain....Huh. I could have almost sworn that those groups of sentences held together by common topics were paragraphs. Maybe I've just gone mad, though. Unless you are using some new definition of the word 'paragraph' of which I was not previously aware, I'd say that the problem is not jumbled writing but jumbled reading.
When I said this, I was refering to your argument that due to the RMS, the transformer is probably going to end up with 34V (which is why I should not use a 30V transformer but keep the 25.2)Now, you said that I can't use a transformer to produce 30V?
I am fully capable of reading your disclaimer and I know you have the possibility of being wrong. I did not know I actually had to refer the word "suspect" to ask a question about your thoughts. Apologies.No, go back and read it again. Slow down and think about what you're reading; I try to think about what I'm writing so that I don't have to go back and explain myself--like I'm having to do right now.
This has nothing to do with transformers. If you take a sine wave and rectify and filter it, you will wind up with a DC voltage 1.414 times the RMS value of the sine wave, minus any diode drops from the rectifier. In this case, you have two diode drops in the rectifier, so you wind up with (25.2 * 1.414) - 1.4 = 34.2VDC.
The 34VDC might be OK for the flyback. Then again, that extra 4V might be the straw that broke the camel's back. I doubt it but I was speaking of the original flyback. If you are in doubt, then use the pass transistor and control pot from the original power supply circuit (which you should probably use anyway) and ramp things up slowly. If it blows up when you hit full power, you know that 34V is too much.
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