Search found 2072 matches

by jwax
Tue Oct 10, 2017 7:06 am
Forum: General Discussion
Topic: USB Power
Replies: 7
Views: 1520

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: 1382

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: 1382

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: 1608

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: 705

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: 705

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: 1685

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...
by jwax
Fri Aug 11, 2017 4:06 pm
Forum: Up For Grabs
Topic: XBee Development kit....GONE
Replies: 3
Views: 2992

Re: XBee Development kit....Still on the shelf!

Hi Len,
What kind of range is reasonable for these transceivers, using simple dipole antennas? What frequency are they on?
Thanks!
John
by jwax
Fri Aug 11, 2017 8:24 am
Forum: General Discussion
Topic: Lightning rods...
Replies: 24
Views: 3537

Re: Lightning rods...

Backup created, but she still lives.
Magic occurs!
by jwax
Sat Aug 05, 2017 6:25 am
Forum: General Discussion
Topic: i need some help with a 741 op amp.
Replies: 4
Views: 906

Re: i need some help with a 741 op amp.

Seems like ideal application for a 555 timer. The sensor, instead of triggering the relay, would start the timer, and any new burst of light would keep resetting the timer. Then, if enough time passes without light, the timer would trigger the relay.
by jwax
Tue Aug 01, 2017 12:02 pm
Forum: General Discussion
Topic: Internet television...
Replies: 6
Views: 1431

Re: Internet television...

They make a nice drying rack for t-shirts.
by jwax
Tue Aug 01, 2017 11:55 am
Forum: General Discussion
Topic: Lightning rods...
Replies: 24
Views: 3537

Re: Lightning rods...

And I thought I saw some weird things in 60+ years in electronics! The pc was still dead after doing the Janitor Tzap procedure. Later in the day, still dead. Twice tried. Dead. At this point, since it's dead, no point trying to fire it up again, right? It is dead! This morning, I went to pull out t...
by jwax
Sun Jul 30, 2017 6:24 pm
Forum: General Discussion
Topic: Lightning rods...
Replies: 24
Views: 3537

Re: Lightning rods...

Commendable attempt, but still no joy.
by jwax
Sun Jul 30, 2017 4:56 am
Forum: General Discussion
Topic: Lightning rods...
Replies: 24
Views: 3537

Re: Lightning rods...

Still got the pc in the scrap heap.
I'll try that Janitor Tzap, but how do I identify the CMOS Jumper? There's a 3-pin male, with a shorting bar across two of its pins near the CMOS battery- could that be it?
Will keep you posted, and thanks for the info!
John
by jwax
Fri Jul 28, 2017 7:19 pm
Forum: General Discussion
Topic: Lightning rods...
Replies: 24
Views: 3537

Re: Lightning rods...

Seems lightning was listening- Had a strike very near the house and the home pc decided to die the way mother boards die, silent but deadly. No visible signs, but will not turn on. Power supply OK, but as soon as it is plugged into the mother board, power supply shuts down. Toast. Yeah- new pc and a...