Search found 25 matches

by ki3u
Wed May 27, 2020 1:06 pm
Forum: General Discussion
Topic: Gauss field shielding the Laptop computer
Replies: 0
Views: 61

Gauss field shielding the Laptop computer

Some data, from the point of view of health physics, on the EMF fields radiated by three different laptops, and the effect of simple magnetic shielding : http://ki3u.byethost3.com/Garden-Kitchen-Health/Laptop%20Gauss%20shielding/Laptop%20Gauss%20shielding.html If anyone has similar data, please shar...
by ki3u
Wed Apr 08, 2020 8:31 pm
Forum: General Discussion
Topic: analog indicator for the Teknetics Patriot Metal Detector
Replies: 0
Views: 4790

analog indicator for the Teknetics Patriot Metal Detector

I've added a simple analog output circuit to my Teknetics Patriot metal detector. It feeds a micro-ammeter which is mounted at the Patriot's control / display head. Aside from the immediate benefit of overcoming the Patriot's LCD display's lack of backlighting, the analog circuit has its own semi-in...
by ki3u
Mon Dec 09, 2019 7:25 am
Forum: General Discussion
Topic: Pancake GM Probe with CDV-700 : simple BNC adapter
Replies: 0
Views: 17821

Pancake GM Probe with CDV-700 : simple BNC adapter

The 6993 GM tube in the CDV-700 Geiger Counter / Survey Meter operates at 900 Volts. There are many GM tubes and radiation detectors which include 900 Volts within their operating range, and some are housed in probes with a female BNC connector. I was interested in trying my CDV-700 with other tubes...
by ki3u
Thu Jul 11, 2019 7:02 am
Forum: General Discussion
Topic: Ammeter shunts
Replies: 0
Views: 16478

Ammeter shunts

Some results using brass shim stock to double the range of an analog ammeter :

http://ki3u.byethost3.com/Radio-Physics ... hunts.html

Berj / KI3U
by ki3u
Mon Feb 11, 2019 4:41 pm
Forum: General Discussion
Topic: A simple ballpark check of a Gaussmeter's accuracy
Replies: 0
Views: 15160

A simple ballpark check of a Gaussmeter's accuracy

I describe a very simple test setup for checking the accuracy of the SJ200 Gaussmeter,
an instrument typical of those in the hundred dollars or so price range :

http://ki3u.byethost3.com/Instruments_e ... check.html

Berj / KI3U
by ki3u
Wed Nov 21, 2018 7:59 pm
Forum: General Discussion
Topic: Adafruit Metro M4 Express Arduino with Windows XP
Replies: 3
Views: 9921

Re: Adafruit Metro M4 Express Arduino with Windows XP

I now have a reliable procedure for the Arduino IDE Serial Monitor working with the M4 board under Windows XP.

I've put the procedure steps as an Addendum in the original webpage :

http://ki3u.byethost3.com/Instruments_e ... in-XP.html

Berj / KI3U
by ki3u
Sun Nov 18, 2018 3:23 pm
Forum: General Discussion
Topic: Adafruit Metro M4 Express Arduino with Windows XP
Replies: 3
Views: 9921

Re: Adafruit Metro M4 Express Arduino with Windows XP

It turns out that one additional check is necessary - I've added it to step 8.) : 8.) The device manager now shows, instead of the Adafruit board, the UF2 Bootloader - change its port to an unused one (e.g. COM21 ). Ignore the listing for the dummy UF2. In the device manager, under Disk drives, chec...
by ki3u
Mon Nov 05, 2018 2:58 am
Forum: General Discussion
Topic: Adafruit Metro M4 Express Arduino with Windows XP
Replies: 3
Views: 9921

Re: Adafruit Metro M4 Express Arduino with Windows XP

I found a couple of typos in the step by step procedure which I have corrected :

In steps 5.) and 6.) the example should read COM20, not COM21.

Berj / KI3U
by ki3u
Sun Nov 04, 2018 6:38 pm
Forum: General Discussion
Topic: Adafruit Metro M4 Express Arduino with Windows XP
Replies: 3
Views: 9921

Adafruit Metro M4 Express Arduino with Windows XP

I've got one of the relatively new Adafruit Metro M4 Express microcontroller boards (still marked BETA) working reliably with an old (2003) Dell Inspiron 5100 32-bit laptop running Windows XP. For those familiar with the Arduino world it will be no surprise that overcoming the "could not find device...
by ki3u
Sun Dec 31, 2017 5:38 pm
Forum: General Discussion
Topic: Santa Claus Christmas Music Box repair
Replies: 0
Views: 16756

Santa Claus Christmas Music Box repair

Judging from online reviews a significant fraction of the polyresin-based Christmas-theme Music Boxes coming out of China have problems brand-new out of the box, right up to totally disfunctional. I thought it worthwhile to devote a little webpage on my website to the diagnosis and repair of a parti...