Search found 1779 matches

by Externet
Thu Apr 12, 2018 7:17 am
Forum: General Discussion
Topic: Need Some Feedback Please...
Replies: 9
Views: 3477

Re: Need Some Feedback Please...

Clarity is important to teach.
Title could be 'Need some feedback about teaching online'.
All initial use of abbreviations and acronyms explained on a side column help novices.
by Externet
Thu Apr 12, 2018 7:06 am
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 5204

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

Hi John. So far I reached a 3 metre distance detection, with a 39000 turns coil. Ideal would be at least 50 metres. Perhaps am lacking mechanical dimensions (length) for the coil core bar. :sad: And refuse to spend too much $ for experimenting. Whenever you find how they detected the sun's magnetism...
by Externet
Sat Mar 10, 2018 8:32 am
Forum: Up For Grabs
Topic: Wanted: A couple of party clickers...
Replies: 9
Views: 1834

Re: Wanted: A couple of party clickers...

Thanks, dacflyer. Those are perfect. Somehow the ones I found before were battery operated. These are the real thing, mechanical snap.
Already in my list, for the next time I go to the 'city' with pet stores !
by Externet
Fri Mar 02, 2018 9:47 am
Forum: Up For Grabs
Topic: Wanted: A couple of party clickers...
Replies: 9
Views: 1834

Re: Wanted: A couple of party clickers...

Thanks, dacflyer. Found only electronic trainers. No mechanical :cry:
by Externet
Sun Feb 18, 2018 8:24 am
Forum: Up For Grabs
Topic: Wanted: A couple of party clickers...
Replies: 9
Views: 1834

Re: Wanted: A couple of party clickers...

Thanks, CeaSaR. That will do it !
And will save that site :smile:
by Externet
Sat Feb 17, 2018 4:34 pm
Forum: Up For Grabs
Topic: Wanted: A couple of party clickers...
Replies: 9
Views: 1834

Wanted: A couple of party clickers...

Hi. Any condition, ugly, rusty, from behind spider webs,... the one you stole from a kid that drove you crazy. Ebay has them at 'collector's prices; the dozen bag at the 99 cent store is not available any more. It is to test sound propagation. Will trade with hard to find IC or other parts. Make you...
by Externet
Sat Feb 03, 2018 8:17 am
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 5204

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

A good portion of noise could be erased by doing it differentially if in noisy environments. That is two sensors to reject common mode.
by Externet
Thu Feb 01, 2018 9:49 am
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 5204

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

:!: Yes, it is very real :!:
by Externet
Thu Feb 01, 2018 8:09 am
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 5204

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

Hi John. I talked to the developer/inventor of that expensive chip yesterday. He suggested trying first with the $30 ones from his company, as a way to evaluate if the expensive one would justify the results/needs/cost. I ordered a 10Km coil of AWG 40 before jumping to the modern sensors; will see n...
by Externet
Wed Jan 31, 2018 5:22 pm
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 5204

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

Hi John. That is exactly the plan. So far.
Because ----> https://www.amazon.com/TMR9001-Ultra-hi ... ometer+tmr
:shock:

Yes, iron core can work as well as mumetal.
by Externet
Sun Jan 28, 2018 6:47 am
Forum: General Discussion
Topic: Detecting a magnet... from a distance.
Replies: 23
Views: 5204

Detecting a magnet... from a distance.

Hi. Let's raise a bit the activity here... A magnet slowly spins in the next room. Or house. Or block. Detecting its presence will depend - on the field strength of the magnet, - the sensitivity of the sensor, - the gain of the amplifier, - and perhaps something else. What method would you implement...
by Externet
Mon Jan 15, 2018 6:04 pm
Forum: General Discussion
Topic: did I blow my Amp
Replies: 6
Views: 2341

Re: did I blow my Amp

Hi. Did you connect it this way ? Being the speaker symbols actually coils of the same subwoofer ?
hak.png
You are a skilled non-beginner... Let's fix it. Power supply rails fine, right ?
Warm up the scope...
by Externet
Fri Jan 12, 2018 7:31 am
Forum: General Discussion
Topic: LOREX LW2742 Wireless Monitor........
Replies: 10
Views: 2275

Re: LOREX LW2742 Wireless Monitor........

Hi Tzap... ----> https://www.ebay.com/itm/US-Stock-10pcs-3-Pin-2-5mm-X-0-7mm-DC-Charger-Socket-Female-Jack-PCB-Power-Plug/371923366879?hash=item56985c33df:g:vUQAAOSwmCVY9We7:sc:ShippingMethodStandard!40391!US!-1 ----> https://www.alibaba.com/showroom/0.7mm-dc-jack.html ----> http://www.ebay.ca/itm/2...
by Externet
Thu Jan 04, 2018 5:53 pm
Forum: General Discussion
Topic: Nuts & Volts issues...
Replies: 2
Views: 1733

Nuts & Volts issues...

Is there a place showing the contents of the other years ?

----> http://gramlich.net/projects/nuts_and_v ... index.html

When was the first issue ? Eighty something ?
by Externet
Wed Jan 03, 2018 8:01 am
Forum: General Discussion
Topic: Very unusual desoldering method...
Replies: 9
Views: 2416

Re: Very unusual desoldering method...

Hi haklesup. The lamp bulb used on the video is a common automotive halogen 12V incandescent headlamp bulb, typically 55 to 65 Watts. One filament has a Graves shield to direct the emission towards one side (or block certain direction). There is also 120VAC halogen bulbs (without the shield) that co...