Search found 2870 matches

by haklesup
Tue Sep 08, 2020 12:58 pm
Forum: General Discussion
Topic: ADR421 Vref IC Low Short-Circuit Current!
Replies: 10
Views: 267

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: 20
Views: 4924

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: 475

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: 342

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: 342

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: 475

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 ...
by haklesup
Fri Aug 28, 2020 1:18 pm
Forum: General Discussion
Topic: CAD File Question
Replies: 10
Views: 244

Re: CAD File Question

I looked a little deeper into this Autocad 2017 and later do have import paths but it is not fully automated and you still need to make a lot of choices along the way. Based on instructions I saw online, it may be more flexible than nanoCAD nanoCAD Pro version has Raster import with object recogniti...
by haklesup
Thu Aug 27, 2020 4:46 pm
Forum: General Discussion
Topic: Problem with AccessHD DTA1080 DTV Converter Box
Replies: 14
Views: 331

Re: Problem with AccessHD DTA1080 DTV Converter Box

you mean the little converter they give you for old fashioned TVs. The audio is part of the RF signal sent to channel 3 and 4 so you need to use an RF to Video+R+L demodulator somewhere, I doubt you can hack the Comcast box, its probably all one chip. Searched on "RF demodulator" and found some try ...
by haklesup
Thu Aug 27, 2020 4:14 pm
Forum: General Discussion
Topic: CAD File Question
Replies: 10
Views: 244

Re: CAD File Question

you can't do that. PDF was originally designed to thwart copying and editing. We can only grab text at all because the format is open source and OCR has been integrated but the image is no more useful than a photograph. There is no layer or dimensional content in a PDF. Even more complications creep...
by haklesup
Tue Aug 25, 2020 12:30 pm
Forum: General Discussion
Topic: Isolate/split power supply
Replies: 2
Views: 203

Re: Isolate/split power supply

you don't need to break the circuit to monitor voltage, just attach the sense point and ground. Some of those little meters are powered from a separate supply and some are powered from the supply you are measuring. (3 and 2 wire respectively). Use 3 wire if the voltage might go below 2V or the meter...
by haklesup
Tue Aug 25, 2020 12:10 pm
Forum: General Discussion
Topic: Problem with AccessHD DTA1080 DTV Converter Box
Replies: 14
Views: 331

Re: Problem with AccessHD DTA1080 DTV Converter Box

Digikey is good if you can place the minimum order and not get overcharged. Just Avoid anything from china on ebay. not just bad electrolyte, there are all sorts of ways to shave costs on the raw materials and QA when bulk manufacturing. The component industry in CN is still suffering from these bad...
by haklesup
Tue Aug 18, 2020 11:49 am
Forum: General Discussion
Topic: Skycool
Replies: 14
Views: 3119

Re: Skycool

Nature abhors perfection, that's why my floor is so dirty

A localized low pressure area is also known as a partial vacuum thus the name is accurate.

Oddly, the "Vacuum effect" has to do with Cats for some reason
by haklesup
Fri Aug 14, 2020 11:59 am
Forum: General Discussion
Topic: Skycool
Replies: 14
Views: 3119

Re: Skycool

its a dr Seuss story about a place where a guy sells air, no trees either (that's the central plot BTW)

Opening theme song:
https://www.youtube.com/watch?v=92lO2Bum7v4
jump to 1:00 and 1:50 minute mark for my reference
by haklesup
Thu Aug 13, 2020 10:04 am
Forum: General Discussion
Topic: Skycool
Replies: 14
Views: 3119

Re: Skycool

thinking the vacuum of space can draw air up a tube totally ignores the mass of the air in the tube wanting to stay closer to earth. It would be like expecting a hand dug open well to gush water like an artesian well. "Give it time,,, they'll find a way to charge us for the air we breath now... And ...
by haklesup
Tue Jul 28, 2020 11:53 am
Forum: General Discussion
Topic: Paralleling circuit breakers
Replies: 13
Views: 733

Re: Paralleling circuit breakers

Sounds good, Fuses anywhere a hardware failure could cause high current. Breakers anywhere the load could overburden the source system, that's technically not a failure, more of an application problem. That addresses overcurrent, you should also monitor battery temperature if you want to maximize li...