On 15/02/2011 02:35, Plastic wrote:
On Tue, Feb 15, 2011 at 8:19 AM, Bryan Horstmann<[email protected]> wrote:
On 15/02/2011 02:03, Plastic wrote:
On Tue, Feb 15, 2011 at 7:56 AM, Tony Firshman<[email protected]>
wrote:
Bryan Horstmann wrote, on 15/Feb/11 13:42 | Feb15:
On 15/02/2011 01:39, Plastic wrote:
On Tue, Feb 15, 2011 at 7:31 AM, Bob Spelten<[email protected]> wrote:
On 14 Feb 2011, at 19:38, Plastic wrote:
... I would be happy to design and manufacture a limited run of these
adaptors to use CR2032s so we can all have our battery backed clocks
working again.
Make sure the total height does not exceed the original.
I had to shave of the legs of the holder to make it fit the QL without
contacting the metal keyboard plate.
There is 7mm of clearance from the top of the ICs below the battery
to
the
top of the tallest component., Most holders are 7.5mm tall. I have
selected
a surface mount, low profile holder that, with the PCB thickness, will
not
be taller than the surrounding components - which leaves 1.2mm of
clearance.
Hope this helps...
Dave
It seems to me that only two pins connect the battery, the other pair
being support; am I right?
Yes. I have seen some builds of GC/SGC with a plus sign but I don't
think
it is a=on all of them. Installation instructions will be needed.
I will do a 1-off design verification board. Yes, only the top left pin
was
+3.0v, and the other three were 0v. On the GC only the bottom right pin
was
connected, but on other designs, other pins may have been used. So the PCB
will have the +ve pin, then all the ground pins will be linked. This way,
the board will also fit other designs that used the same battery.
Later I will remove the ICs and continuity test to confirm the board is
electrically the same as appearance, as it is a 4-layer board and there
may
be a hidden via.
I will include full, IKEA-style instructions :)
Dave
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On my SAFT battery only two pins are connected, + and - , the other two are
isolated.
Bryan
On my SAFT example here (date code 97 12) there is a +ve indication top left
but no -ve indication. All three other pins have continuity to each other.
Is your different?
Mine is labeled:
===================
*+* SAFT
memoguard
40 LF 220
Lithium 3V
97 02
===================
Dave
The only difference is that mine is 92 10, even older.
Bryan
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