Search found 2879 matches

by haklesup
Thu Nov 19, 2020 1:52 pm
Forum: General Discussion
Topic: Yet another battery charger question...lol
Replies: 8
Views: 845

Re: Yet another battery charger question...lol

Its not unreasonable that the charger you have has a resistor divider that sets a threshold for a comparator you can adjust but without a schematic or even a photo, its pure speculation. If you keep looking, I'm sure you can find a 120V version, sometimes the graphics in ebay ads don't match the vol...
by haklesup
Thu Nov 19, 2020 11:47 am
Forum: General Discussion
Topic: Not-A-Fuse fuse?
Replies: 7
Views: 210

Re: Not-A-Fuse fuse?

I see, I had not paid much attention to those before, Here is a bunch more info https://www.littelfuse.com/products/polyswitch-resettable-ptcs.aspx In the OP application, unless you strap one of these to a heat source, one should not experience oscillation if the right device is selected. They seem ...
by haklesup
Tue Nov 17, 2020 11:43 am
Forum: General Discussion
Topic: Yet another battery charger question...lol
Replies: 8
Views: 845

Re: Yet another battery charger question...lol

Certainly no shortage of Solar compatible or other charge controllers on ebay or Amazon for under $100
by haklesup
Mon Nov 16, 2020 4:33 pm
Forum: General Discussion
Topic: telephone interface
Replies: 3
Views: 128

Re: telephone interface

want to answer a landline on a cell phone, depends on the phone company but they probably have an app you can put on a mobile device. Want to answer your cell phone on a convenient handset at home without any POTS account. Probably won't find a good interface to a landline POTS handset standard but ...
by haklesup
Mon Nov 16, 2020 4:05 pm
Forum: General Discussion
Topic: Not-A-Fuse fuse?
Replies: 7
Views: 210

Re: Not-A-Fuse fuse?

"A solid state fuse can oscillate. ( set-reset loop ) A resettable fuse can oscillate. ( set-reset loop )" Can you give an example of a fuse or circuit breaker that self resets without user intervention? Something called a "fuse" should not self reset What is a solid state fuse? Do you mean a voltag...
by haklesup
Thu Nov 12, 2020 2:27 pm
Forum: General Discussion
Topic: Yet another battery charger question...lol
Replies: 8
Views: 845

Re: Yet another battery charger question...lol

What's inside? By the looks of it from ebay ads, seems like just a transformer, rectifier, fuse and ammeter. Certainly can use that as the unregulated front end to an add on circuit if you need V or I cutoff. Simplest mod might be to run the output through a relay contact and control the coil with s...
by haklesup
Mon Oct 26, 2020 3:20 pm
Forum: General Discussion
Topic: High Powered/Long Distance HF RFID Antennas?
Replies: 3
Views: 480

Re: High Powered/Long Distance HF RFID Antennas?

Try searching "High Sensitivity RFID" here are some interesting presentations that help to illuminate some of the problems and solutions: https://www.gs1.org/sites/default/files/10_-_2016_brussels_event_fudan_university_long_range_rfid_final.pdf https://rainrfid.org/wp-content/uploads/2016/10/RAIN-R...
by haklesup
Mon Oct 26, 2020 3:05 pm
Forum: General Discussion
Topic: SRM motor
Replies: 3
Views: 731

Re: SRM motor

according to the website, the only applications they are selling to are HVAC, I don't think this is a universally useful solution. It may not have enough torque for other applications. It may be the wave for large building HVAC but not sure what else.
by haklesup
Mon Oct 26, 2020 2:59 pm
Forum: General Discussion
Topic: My Toshiba is dying help...
Replies: 22
Views: 1282

Re: My Toshiba is dying help...

If nothing is really failing, than an SSD swap alone will generally speed up most computers. If you are running Win 10, then try resetting from the recovery tab in settings, this usually replaces any corrupted system files and reformats the memory map. If Win 7, try reinstalling windows by another m...
by haklesup
Tue Sep 08, 2020 12:58 pm
Forum: General Discussion
Topic: ADR421 Vref IC Low Short-Circuit Current!
Replies: 10
Views: 845

Re: ADR421 Vref IC Low Short-Circuit Current!

Where are you seeing 27mA in the spec. The DS says 10mA output and figure 9 indicates supply current is quite sensitive to operating temperature this the typical spec. If I had one, I could hook it up to a curve tracer and let you test it remotely by zoom meeting (but I don't have that part)
by haklesup
Tue Sep 08, 2020 12:43 pm
Forum: General Discussion
Topic: How Do you Clean A Deep Fryer?
Replies: 24
Views: 6620

Re: How Do you Clean A Deep Fryer?

A hot power cord or connector (not just warm but hot enough to damage itself or burn a person) would indicate a series resistance fault. This can be dirty contacts on the exterior but also poor construction internally if for example strands of the wire break before a crimped connection or oxidation ...
by haklesup
Thu Sep 03, 2020 10:21 am
Forum: General Discussion
Topic: Making PCBs at Home
Replies: 11
Views: 1110

Re: Making PCBs at Home

That method clearly predates accessible computers with CAD, I would have thought it to be early 90s but I found this article from 1997. There are many options to optimize the artwork creation today but the transfer and etch steps are largely similar. http://techdoc.kvindesland.no/radio/ymse1/2006111...
by haklesup
Wed Sep 02, 2020 11:18 am
Forum: General Discussion
Topic: 18 Volt Sub C NiCd Battery Packs (1.2 x 15)
Replies: 11
Views: 947

Re: 18 Volt Sub C NiCd Battery Packs (1.2 x 15)

Seems like a Lithium pack rebuilding service would need to carry some heavy liability insurance or risk going down in flames. Or lengthy T&Cs like these, see 9 and 15 https://www.mtobattery.com/pages/terms-of-service Otherwise, this site seemed to have a comprehensive selection, no comment on price ...
by haklesup
Mon Aug 31, 2020 4:40 pm
Forum: General Discussion
Topic: 18 Volt Sub C NiCd Battery Packs (1.2 x 15)
Replies: 11
Views: 947

Re: 18 Volt Sub C NiCd Battery Packs (1.2 x 15)

Last time I checked, rebuilding a pack like this was only going to save me a few dollars over a new replacement pack (Greenworks BP91001). It may be more of an advantage when rebuilding laptop battery packs. Original Pack has 15 cells, NiCd, 1700mAh, I found one NiCd, 1700mAh with tabs assembled for...
by haklesup
Mon Aug 31, 2020 4:13 pm
Forum: General Discussion
Topic: Making PCBs at Home
Replies: 11
Views: 1110

Re: Making PCBs at Home

The Printed Full scale images can be used with the Photolithography methods. This works best with single sided PCB designs but can be used for 2 sided but I wouldn't attempt that without first making some single sided boards. Usually one obtains some Positive pre sensitized single sided copper clad ...