Now I am doing it again...bored so I comment....
The LM317T is a venerable little beast. My little project uses one. For my purposes a 180 Ohm resistor is used for the job. Sure, things change from design to design...
All I know is that in my case...no issues ever. Like a perfect match???
Going on for more than a Year of testing..the little E3's seem to be getting brighter, the LM317T is not moaning....nothing is abnormal...and as people that have followed or read my threads would know....this little light was put through the mill...
Rated at 220VAC it successfully ran for 3 runs @ 400VAC. For 5 Minutes each way. No blow ups. No repairs. A Year ago. And still running...
Funny stuff. People want to buy them......I say no. Testing not complete...They say how "much longer"?
Truth is the casing is a problem. And yes it's an X2 Cap design. I have to mill parts and keep prying fingers out of "the insides"...
I am probably around 90% there with casings. ABS and all.
Forgive me if I ramble a little bit. I hope you Guys don't mind.
I absolutely hate SMPS. Everyday of my life on CRT I have to deal with the same crappy Chinese SMPS design we are seeing here lately for CRT sets.
It's like one bright spark there designed a "maybe good" SMPS for TV's....and it has been copied flat out by all and sundry.
All the same. Blow up the same. And are reliably the same.
And yet...a Company maybe like Delta Electronics in China makes the very best SMPS for Lappies Etc.
My SMPS for my Acer lappie has worked solidly since 2006...
And is still running as I type here......and that is a sealed enclosure that gets "really" hot. It has weathered games, a lot of Mains surges, like stuff that should make it blow up....
I have said this before and I will say it again....and I will shout as much as I can so people get the message:
ALL SWITCH MODE POWER SUPPLIES ARE NOT CREATED EQUALLY. THERE ARE PROFESSIONAL DESIGNS THAT ARE UNBURSTABLE.
I once said that PROPER SMPS design is a "dark art". People disagreed with me.
Even I dabbled with SMPS...anyone remember the Viper series from Thompson.....I purchased 100 Viper 50's from America. Brand new.
I had someone in New Zealand winding the little Chopper Transformers for me....switching at 100 KHZ....full design and guidelines given by Thompson...
I received five little Chopper Transformers from the Guys in New Zealand...only ONE worked. Kind company there that wanted to help me. They did not charge me postage or anything.....FREE from there to here.
I laid out the board and traces according TO THE BOOK. Vipers should have been singing...
Switch on...Bang. 4.7 Ohm safety resistor popped. Fail. Viper to heaven...One gone...99 left.
And so I soldiered on. Next sample. Same board...different little SMPS transformer..
Switch on....hey it's working
I am so happy I take the little thing and show my friends. In it's little enclosure it is capable of charging a 7.5 aH Sealed Lead Acid Battery much quicker than any commercially available product......like other duties too...maybe trickle charging a car battery in Canada where it is cold.
I see Dollar signs.
Next little Chopper Transformer arrives. Very confident now. Good stuff here...and ******* bang.
And the next one...bang.
So I think I culled it at around 6 wasted.
I believe I have around 94 of the original Viper 50's left. What an experience.....
You know, on a seriously funny note.....for me...and this goes back to around 2002...
I built a SMPS that actually worked. As a rookie. Well, only one...but it worked.
Regards,
tvtech