Search found 2095 matches

by jwax
Thu Feb 01, 2018 7:40 am
Forum: General Discussion
Topic: Very unusual desoldering method...
Replies: 9
Views: 2978

Re: Very unusual desoldering method...

Maybe add a glass lens and fry small critters like ants!
Or, contactless wood burning!
by jwax
Thu Feb 01, 2018 7:29 am
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 6744

Re: Detecting a magnet... from a distance.

That price of $1,200 seems a tad high for that chip.
Should be: https://www.amazon.com/TMR2102P-Linear- ... 611&sr=8-1

Of course, lenp's idea is feasible too. :)
by jwax
Wed Jan 31, 2018 2:35 pm
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 6744

Re: Detecting a magnet... from a distance.

I'll bite. How about a million-turns coil, and a nano-voltmeter?
Question- would it be more or less sensitive with air core or iron core?
by jwax
Sun Jan 14, 2018 5:50 am
Forum: General Discussion
Topic: Hammond die cast al case, heat sink?
Replies: 11
Views: 3692

Re: Hammond die cast al case, heat sink?

Better than no heat sink!
by jwax
Thu Dec 28, 2017 6:40 am
Forum: General Discussion
Topic: Greetings!
Replies: 9
Views: 4528

Re: Greetings!

Hoping all us kids got what they were hoping for this Christmas! (if you've been nice all year!)
The only plan I found that works for not enough storage space is to buy more space. Time to move! :)
Happy New Year all!
John
by jwax
Wed Nov 08, 2017 3:31 pm
Forum: General Discussion
Topic: Microwave oven transformer... reversed.
Replies: 10
Views: 4267

Re: Microwave oven transformer... reversed.

Amazingly versatile transformer, that is. Wind it for whatever you like!
Only concern about an unloaded secondary with the primary powered, is contact between the secondary wires! Lotta amps!
by jwax
Mon Oct 16, 2017 11:45 am
Forum: General Discussion
Topic: Ink Drowned my AIO Printer
Replies: 14
Views: 3098

Re: Ink Drowned my AIO Printer

Thanks, but still cannot find in the manual any hints at "Cleaning the cartridge nozzles". :(
Have used hot water after removing the cartridge from the machine, or even isopropyl alcohol. But, the old cartridges are stubbornly clogged.
by jwax
Tue Oct 10, 2017 7:28 am
Forum: General Discussion
Topic: Ink Drowned my AIO Printer
Replies: 14
Views: 3098

Re: Ink Drowned my AIO Printer

Sorry to hear of the inkjet troubles! My ancient HP650C Plotter is still chugging along, as I do quite a bit of roll printing. Cartridges for this 1990-era machine are the problem. Many, many suppliers sell old reman cartridges, or out of date originals, so finding ones that work is a constant searc...
by jwax
Tue Oct 10, 2017 7:06 am
Forum: General Discussion
Topic: USB Power
Replies: 7
Views: 1898

Re: USB Power

From the wiki page that Janitor Tzap referenced:

Electrical
Signal 5 V DC
Max. voltage
5.00+0.25
−0.60 V[a]
5.00+0.25
−0.55 V (USB 3.0)
20.00 V (PD)
Max. current
0.5 A (USB 2.0)
0.9 A (USB 3.0)
5 A (BC 1.2)
3 A (type-C)
Up to 5 A (PD)
by jwax
Fri Aug 18, 2017 5:33 pm
Forum: General Discussion
Topic: Dead Dell Laptop
Replies: 4
Views: 1689

Re: Dead Dell Laptop

Good info! Thanks! Next comes connector replacement!
by jwax
Fri Aug 18, 2017 11:01 am
Forum: General Discussion
Topic: Dead Dell Laptop
Replies: 4
Views: 1689

Dead Dell Laptop

Well, not entirely dead, but battery will not charge. Dell Inspiron 8500 laptop, many years old, but reliable until now. Works on AC, but battery does not charge, all of a sudden. Tried an old, but still OK battery and same result- doesn't charge. Also, on power up, get the message, "AC Power Adapte...
by jwax
Thu Aug 17, 2017 8:07 am
Forum: General Discussion
Topic: Direct backlight LED strips in 48" Samsung TV...
Replies: 7
Views: 2127

Re: Direct backlight LED strips in 48" Samsung TV...

Maybe the ebay seller could answer that. 2-3 volts each is typical of LEDs, but series/parallel wiring will dictate what power source is needed. Could always power it up starting low, slowly increase voltage until they get a little too warm? Flat panel ceiling lamp, eh? Nice project! I'd like one of...
by jwax
Sun Aug 13, 2017 8:29 pm
Forum: General Discussion
Topic: Master Magnet
Replies: 2
Views: 940

Re: Master Magnet

Nope- not in N & V that I've seen. What I haven't seen demonstrated is one more polarity reversal beyond levitation- and that causes the attraction. It's clever looking as to how Leonerd arranged that in his Master Magnet, just would like to see it work before building it. Anyone want to explain the...
by jwax
Sun Aug 13, 2017 4:27 pm
Forum: General Discussion
Topic: Master Magnet
Replies: 2
Views: 940

Master Magnet

Some years ago, there was an article called, "Master Magnet", by Leonard Crow. It was instructions on how to build a magnet, powered by 120 VAC, that could pick up Non-Ferrous metals like copper and aluminum. http://www.rexresearch.com/mrmagnet/mrmagnet.htm Has anybody tried building such a magnet? ...
by jwax
Sun Aug 13, 2017 9:43 am
Forum: Up For Grabs
Topic: Solar Tabbing Ribbon
Replies: 0
Views: 4659

Solar Tabbing Ribbon

Have a large quantity of the tabbing ribbon used to build your own photovoltaic modules. Several different sizes of solder tinned copper ribbon- rolls are many, many meters in length! Let me know if interested, and I'll provide sizes and Ulbrich's part numbers. All still factory packaged. Willing to...