If you change R1 to 3kΩ, the 2N3906 should have a output saturation voltage of <50mV @ 10mA load, so the output voltage would be about 2.95V with a 3V battery.But I wonder if output is less than 3v. My Ckt needs min 3 v to function.
Yeah, I'm working on an update. I temporarily forgot that Vcc was so low. For that, a 3906 gets you Vcc switching rather than GND switching, and more consistent performance at such a low drive voltage.If you change R1 to 3kΩ, the 2N3906 should have a output saturation voltage of <50mV @ 10mA load
That has been the biggest issue, with saving battery.
You might consider using one Primary Lithium thionyl chloride (non-rechargeable) battery (here), which has a voltage of about 3.6V.need 3V
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