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Re: [IRCA] [NRC-AM] PL-300WT/ G8 Watch Battery-- The Full Story
On 14-Jul-09, at 8:56 PM, D1028Gary@xxxxxxx wrote:
With such a limited function, this watch battery is certainly not a
vital part of the radio's circuitry. Tecsun probably figured that
the battery should last for years with such a minor mission, and
did not design an easy way for removal or replacement. There is
some lettering stamped on the battery's side, such as "C.C/DCT/0C"
and "0.22F," but no company name. Disassembly of my G8 to obtain
this information was far from routine, and is not recommended for
hobbyists without serious technical experience. There was the
fringe benefit of finally seeing the actual DSP chip in the G8,
however-- a surprisingly small (1/8" square) component located
quite close to the soldered-in positive terminal of the watch battery.
0.22F? I suspect that this is actually a 0.22 Farad super capacitor, not
a watch battery.
Such capacitors are often used in place of backup batteries in modern
electronics:
<http://www.batteryuniversity.com/partone-8.htm>
It would be charged by the AA cell that runs the clock, and would
provide power
to keep the clock going with the battery removed.
No need to worry about ever replacing it if indeed it is a
supercapacitor :)
73,
Deane McIntyre
VE6BPO
(who has found the G8 for sale at $59.95 at two local "The Source"
stores
here in Calgary AB but so far has resisted the temptation)
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