[time-nuts] Backup battery power for Jupiter receiver

Chuck Harris cfharris at erols.com
Mon Jul 27 15:51:32 UTC 2009


Sounds to me like you are driving the whole receiver with the
backup battery.

Typically, memory backup circuitry uses a pair of diodes to
isolate the +5V supply and the backup battery from each other.

Perhaps when they left the super cap off of the circuit board,
they installed a jumper wire where the +5V isolation diode would
need to be?

-Chuck Harris

jmfranke wrote:
> Has anyone successfully used the onboard super capacitor or external 
> battery backup?  I added the capacitor, but I still lose the memory 
> contents when I repower the receiver.  I tried connecting a 4-5V 
> external supply to the battery backup (pin 3), but the pin draws 100mA.
> 
> John
> 
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