[time-nuts] [Bulk] Re: Oncore battery

J. L. Trantham jltran at att.net
Mon Apr 25 13:09:51 UTC 2016


Another option for the UT+ (not sure it's applicable to the M12M) is to remove/disconnect a SMT resistor that connects the (+) terminal of the rechargeable onboard battery to pin 6 (IIRC) and use a non-rechargeable battery of the same form factor.  I've done that for one of my receivers and it's lasted for over a year now.  I don't recall the exact battery type but I can get it if anyone needs it.

Joe

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Pete Stephenson
Sent: Monday, April 25, 2016 6:34 AM
To: Discussion of precise time and frequency measurement
Subject: [Bulk] Re: [time-nuts] Oncore battery

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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