[time-nuts] Oncore battery

[Clint Jay]

Very handy,  I've picked up a few Oncore receivers recently and was
planning to test them all and then replace the batteries in the good
ones.  Has anyone worked out what the original charge circuit schematic is
though?
On 25 Apr 2016 13:01, "Pete Stephenson" <pete at heypete.com> wrote:

> I have several 5V Oncore UT+ receivers of the type that did not
> include a rechargeable on-board battery, but didn't want to bother
> with lithium primary batteries or rechargeable batteries and their
> associated holders so I opted to use supercapacitors. Specifically, I
> use the Panasonic EEC-F5R5U105 supercap with a capacitance of 1F and a
> max voltage rating of 5.5V.
>
> Charging is easy: I simply run 5V power through a diode and a resistor
> sized to prevent exceeding the diode's current limit and the capacitor
> charges in about 20-30 minutes. The diode prevents the supercap from
> discharging through the resistor when the power fails.
>
> I use a 1N4148 small signal diode rather than a 1N400x-series diode
> because the 1N4148 has a smaller reverse leakage current. A 240 ohm
> resistor keeps the peak current to 20mA (the diode can handle up to
> 200mA forward current) and the capacitor is charged up in about 20
> minutes after power-on. Adjust the values for your specific needs.
> Once charged, it maintains the Oncore's RAM for several weeks with no
> power.
>
> On Mon, Apr 25, 2016 at 12:25 PM, Azelio Boriani
> <azelio.boriani at gmail.com> wrote:
> > Panasonic ML621 or equivalent. Alternatively you can use the battery
> > pin (pin 6): remove the onboard battery and use en external primary
> > cell (CR2032 or equivalent). See pages 15 to 21 of the M12M user
> > manual.
> > <
> http://www.ilotus.com.sg/~ilotus/sites/all/themes/zeropoint/pdf/m12m/M12M%20-%20User%20Guide%20%28Ver%201.0.0%29.pdf
> >
> >
> > On Mon, Apr 25, 2016 at 2:11 AM, Joseph Gray <jgray at zianet.com> wrote:
> >> Can anyone recommend a rechargeable lithium coin cell that is a direct
> >> replacement for the ones that come on some Oncore receivers? Something
> >> I can order from Mouser or Digikey, if possible.
> >>
> >> Joe Gray
> >> W5JG
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>
> --
> Pete Stephenson
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