2024-03-10 15:19:42 <KipIngram   > Nice document here on sngle-supply opamp circuits:
2024-03-10 15:19:44 <KipIngram   > https://www.ti.com/lit/an/sloa030a/sloa030a.pdf
2024-03-10 15:20:18 <KipIngram   > Normal opamp usage calls for positive and negative supply rails.  Things are more delicate when you only have +V and ground (like in a normal battery operated circuit).
2024-03-10 15:24:10 <KipIngram   > That little ADC board I mentioned yesterday gives me +5V, +3.3V, and ground.  I want to mount a little protoboard above it on standoffs and put my current-to-voltage converter there.
2024-03-10 22:45:12 <KipIngram   > Oh, this is probably better than trying to measure a load current:
2024-03-10 22:45:15 <KipIngram   > https://i.stack.imgur.com/koZoS.png
2024-03-10 22:46:30 <KipIngram   > Here I'd SET the current I wanted via the DAC block (which could just be a variable voltage divider).  I'd measure the voltage across RSet and know the current I was setting from that.  And then measure the cell output.
2024-03-10 22:47:11 <KipIngram   > Real loads tend more toward constant current sinks than toward resistances anyway.
2024-03-10 22:50:54 <KipIngram   > Turning Q1 off would open the cell circuit to allow recharging.