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I like the idea of just disconnecting the sensors and keeping everything else alive. Still I will need to protect the rest of circuit from surges.
Soeren: I am not aware of soft start and disconnect mechanisms. Can you please point me to some?
As for the battery charger, it is a charger specifically made for charging NiMh batteries and has detections for overcharging and sensing the existing charge levels so all I need to do is to connect the battery to the charger once the robot is docked.
If I put a 1A protection diode across the battery charging circuit, wouldnt this prevent current surges?
I suppose SmAsH is right as my charger stops the charging once the battery is charged so disconnecting shouldnt be a problem. I need to try this out.
Hi.... please comment on the attached representation of the proposed circuit. The R1 represents the load (in this case sensors), B1 represents the NiMh 9V battery, B2 is the charger (which will take care of overcharging issues etc). The PNP diode will turn off the load as soon as the B2 turns on.