I have an in car DVD player that I may want / need to run off the mains
whilst on holiday. The DVD player does not have a mains adaptor included.
I do however have a small TV that runs off a car lighter socket that does
have a mains adaptor included. The DVD DC input socket says 12V (Positive
Centre), the TV DC innput socket says 12 to 15V (Positive Centre). When I
check the adaptor with my multimeter it is actually kicking out 17.5V. The
adaptor has been running the TV from mains for at least 4 years (kitchen /
cooking viewing) so the 17.5V hasn't done any harm there but will it cause
any damage to the DVD player (Centurion PP70DVD2)?
A cheap, unregulated power supply will output a higher voltage when
there's no or little load. So your multimeter might over-read.
Try reading the voltage when there's a typical current flowing. (Got a
12v torch bulb somewhere?)
I don't reckon you'd have any problem - providing the adaptor has sufficient
power output (with moving parts, your DVD may demand more than the telly).
IME, there is enormous tolerance on these things. And as AJ points out, the
no-load voltage will read higher than when in use. Why not measure the
voltage when it is actually powering the telly?
Er... good point.
I'm lucky enough to have all kinds of bits and bobs, so would be able to
link in a meter.
Also, meter leads often (well, mine do) come with a pair of sharp pointy
probes which readily make contact though the insulation on bell-wire type
flex. But I suspect the lead to the concentric 12v socket won't have an "8"
x-section, so won't be "probe"-friendly.
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