Search found 22 matches

by ki3u
Thu Jul 11, 2019 7:02 am
Forum: General Discussion
Topic: Ammeter shunts
Replies: 0
Views: 162

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: 1931

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: 2796

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: 2796

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: 2796

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: 2796

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 d...
by ki3u
Sun Dec 31, 2017 5:38 pm
Forum: General Discussion
Topic: Santa Claus Christmas Music Box repair
Replies: 0
Views: 3511

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...
by ki3u
Sat Dec 16, 2017 10:37 am
Forum: General Discussion
Topic: Experimental analog-circuit gas detector / alarm
Replies: 2
Views: 5628

Re: Experimental analog-circuit gas detector / alarm

NeilXu wrote : " Hi...i am a new user here. I took a look at your circuit and there a few things that I can mention. Firstly, if you need something as complex as a GSM Modem, you will need to create a LabVIEW instrument for it if that is possible. If you know the exact input you are going to re...
by ki3u
Mon Oct 30, 2017 3:58 pm
Forum: General Discussion
Topic: Experimental analog-circuit gas detector / alarm
Replies: 2
Views: 5628

Experimental analog-circuit gas detector / alarm

For anyone interested I've put online on my website a description of my experiments resulting in the development of an experimental gas detector / alarm based on analog circuitry, and not involving any digital electronics : http://ki3u.byethost3.com/Instruments_etc/Exp_Gas_Detector/Exp_gas-detector-...
by ki3u
Mon Jun 26, 2017 5:52 pm
Forum: General Discussion
Topic: Cooling troubling electronics
Replies: 0
Views: 3879

Cooling troubling electronics

Sometimes often enough you can get lucky and implement a quick and easy fix, if only a temporary one, of
a troubling electronic device :

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

Berj / KI3U