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[aprssig] Shunt for battery current / APRS Telemetry

Phillip B. Pacier ad6nh at arrl.net
Thu Feb 23 23:13:57 UTC 2006


I am in need of assistance with building a shunt circuit to measure the 
charging amperage of my solar-powered digi.  I have found some vague 
references on the web, but none that tell me how to figure out what 
values of what components I need in order to achieve my desired goals.  
For reference, if it makes things easier, I believe the maximum current 
will never get above 12.7 amps.  Therefore, dividing the 255 max 
telemetry range in half gives 127.5, or 12.75 amps.  That makes the 
calculations easier - now, how do I build this circuit?  I have already 
done the voltages with the divider circuits - that was easy.  Thanks in 
advance!

73
Phil Pacier - AD6NH




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