Digest for sci.electronics.repair@googlegroups.com - 12 updates in 4 topics

Peter Jason <pj@jostle.com>: Jan 26 10:58AM +1100

On Thu, 24 Jan 2019 09:24:00 -0000, Mike Coon
>> Peter
 
>Squirrel wants out? (Well someone had to say it...)
 
>Mike.
 
I tried pouring oil down its nose, but the noise
never changes. :-)))
Peter Jason <pj@jostle.com>: Jan 26 11:01AM +1100

On Fri, 25 Jan 2019 12:31:21 +0000, N_Cook
>> Peter
 
>Is it being powered by clean sine 50/60 Hz or some sort of dirty
>chopped/synthesised 3 phase via a converter?
 
We have no choppers. And other squirrel motors on
the same power system are quiet as ever.
adrian@poppyrecords.invalid.invalid (Adrian Tuddenham): Jan 26 03:04PM

> 12 months. The motor is not overheating, nor are
> the bearings.
 
> Is this serious?
 
If it has a phase-shift capacitor, that has probably changed value and
is on the way to failing. Substitute another one of as near the right
value as possible and see if that stops or alters the noise. (Make sure
the capacitor is discharged each time before touching it.)
 
 
--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
arlen holder <arlen@arlen.com>: Jan 26 05:23AM

Do you have experience with "infrared camera detection" on mobile devices?
 
If so, how do you assess the difference between
o How the infrared camera detection works on a mobile device, versus
o Similar functionality, in almost _any_ digital video camera viewfinder?
 
Note this question is only about the inherent infrared detection
differences between almost any digital camera ... and these "green-screen"
viewfinder apps.
 
Today I decided to check an area for hidden cameras and microphones
where the first non-obnoxiousware non-Internet non-GPS-aware
free tool I happened to test was
o Detect Hidden Camera, version 1.9
o (com.techno95.detecthiddencameraandmicrophone)
 
The way "it" works is pretty simple, apparently, where
o It detects rf emitters using the magnetometer reading, and
o It detects infrared emitters using a "green screen" video viewfinder
 
Based on an Internet search, these tools abound on both iOS & Android:
<https://knowtechie.com/smartphone-apps-can-help-detect-hidden-cameras-anywhere/>
<https://www.techzac.com/best-hidden-camera-detector-apps-android/>
<http://www.graphictunnel.com/2017/09/best-hidden-camera-detector-apps.html>
etc.
 
My question for this newsgroup is only about that green-screen viewfinder.
Q: Essentially, other than being "green" - how is it any different from
almost _any_ digital video viewfinder (all of which seem to detect infrared
emissions)?
Fox's Mercantile <jdangus@att.net>: Jan 26 04:20AM -0600

On 1/25/19 11:23 PM, arlen holder wrote:
> Do you have experience with "infrared camera detection" on mobile devices?
 
Go away.
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
newshound <newshound@stevejqr.plus.com>: Jan 26 10:35AM

On 26/01/2019 10:20, Fox's Mercantile wrote:
>> Do you have experience with "infrared camera detection" on mobile
>> devices?
 
> Go away.
 
+1
etpm@whidbey.com: Jan 25 09:19AM -0800


>Oh, it worked in the past? Or maybe you've never had a good square wave
>to check it with?
 
>GH
Yeah, it worked in the past using the square wave output on the
'scope.
Eric
"Ron D." <ron.dozier@gmail.com>: Jan 25 10:52AM -0800

1. The adjustment only works in anything but x1 mode.
 
2. The adjustment corrects the squareness of a square wave. It makes the divider resistive.
 
3. Probes are designed for a certain input Z e.g. 1 M 22 || pf and freq response
Make sure the scope isn't 50 ohms.
 
4. For the adj, the scope should be DC coupled.
 
5. Scope could be in UNCAL mode. Freq or voltage.
 
6. Check voltage with a DC source. Freq: Try the AC line for frequency.
etpm@whidbey.com: Jan 25 04:06PM -0800

On Fri, 25 Jan 2019 10:52:54 -0800 (PST), "Ron D."
 
>4. For the adj, the scope should be DC coupled.
 
>5. Scope could be in UNCAL mode. Freq or voltage.
 
>6. Check voltage with a DC source. Freq: Try the AC line for frequency.
That DC couplng migt be the problem. It was mentioned in another post
too. Tomorrow I will check things again with the 'scope properly set
up and report back.
Thanks,
Eric
etpm@whidbey.com: Jan 25 04:08PM -0800

On Thu, 24 Jan 2019 14:53:30 -0800 (PST), Terry Schwartz
>> Thanks,
>> Eric
 
>Sounds like it's AC coupled.
It is. DC didn't seem to change things but I don't know. Tomorrow I
will have time to set everything properly and will report back.
Thanks,
Eric
mailserver.cctv@gmail.com: Jan 25 11:58AM -0800

It's mapped to the "any" key on the keyboard.
John Robertson <spam@flippers.com>: Jan 25 12:50PM -0800

On 2019/01/24 5:06 p.m., KenW wrote:
>> (And by the way, who is their governor)?
 
>> .... :)
 
> Did you try State of Confusion ?
 
Actually it is next to State of Mind...
 
John ;-#)#
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