Whilst looking for something which I put in a safe place in my
stocks(no. I didn't find it!). I found that somewhere in the past few
years I had purchased a small dome CCTV camera. As one of my cameras was
very old and not very sensitive, I decided to fit the dome camera in
it's place. The theory was OK, but I found that the camera had
interference patterning and vertical blooming when operating. I checked
the operating voltage, it was a bit high, so hooked the unit up to my
bench psu to see if this had any effect. No, over a range of 9 to 15V
the behaviour was the same. Then by accident, I switched off the study
lights and found that the interference patterning was apparently being
caused by the CFLs radiating into the unscreened camera. Subsequent
testing didn't remove all the vertical blooming effects, so I'm still
looking into that. I replaced the old camera with a spare modern metal
cased outdoor unit which I had in my stocks and it all worked OK. It
appears that some plastic cased cameras can pick up radiated
interference from CFLs and fluorescent lamps. Anybody else found this?
The PSUs required came from my stocks of it may be useful one day
Unfortunately, the latter option is rarely used. Whatever it was, there
is a newer, better one available now.
Meanwhile, we try to fix them, although I'm not sure where to start on
a JVC version of a Walkman. It's too compressed...
FSVO of "better" none of the smart phone calendar or alarm apps I've
tried come anything close to the useabily of those found on a Psion
Most faults are not with the surface mount electonic guts but with
the interface to the real world that the cack handed user has broken.
Mind you the last few faults I've had have been down to poor
manufacture, component not properly positioned when soldered so it
moves and breaks the tracks or comes away after a little bit of use.
Not that difficult to fix.
SMD Micro USB socket on Li battery back, can lugs had not taken
solder properly and contacts came away from pads.
Through hole IDC connector in a modular socket not fully seated
against board. First punch down pushes pad off board and breaks
exteremely fine track.
Further up the thread, we have CFL and CCTV, but not EP or LP.
On the original subject, when I worked in industry, any two-way radio
keyed near a Honeywell PID Controller would send it crazy, with
corresponding effects on the process, which were usually in car factory
And I could not wear hearing aids in a room with lots of fluorescent
lighting, the resulting buzz was far worse than loud tinnitus.
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