Battery drown current is 71mA
Minimum battery capacity require in mAH = 71*9 = 639
Approximately 1000mAH battery would be safe
Generally in a boost converter the battery current is in a separate loop from the output current, even though they share the same ground.I thought, the battery current will be included into the loop current to operate the transmitter. .............
I shall use 6 1.5V AA cell and boost the voltage to 30V using buck boost IC. Can you specify any better IC?You may use 6 1.5V 2000mAH AA cells in series.
Basically like post #12 in the merged thread which works as current sink for two-wire loop interface, add a positive supply voltage to make a current source. I presume that the current source output of a portable instrument must not necessarily be grounded.any reference circuit for unipolar current source with single precision shunt resistor?
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