Search found 2077 matches

by jwax
Sun Jan 14, 2018 5:50 am
Forum: General Discussion
Topic: Hammond die cast al case, heat sink?
Replies: 11
Views: 3412

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: 2362

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: 3959

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: 2783

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: 2783

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 Many, many suppliers sell old reman cartridges, or out of date originals, so finding ones that work is a constant searc...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: 1722

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: 1538

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: 1538

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: 1837

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: 822

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: 822

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: 1941

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: 3261

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: 4061

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: 1047

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.