I'm trying to use a howland current source to generate stable current for a load which is =<40 ohms. The load is connecteddoes not need to ground but I can't find the appropriate gainbe connected to help me achieve thisgroud. I can work with a DAC to supply the Vin (V3 in the figure), which would help me control the load current, however, I'd like to limit the voltage used as input to 12V if possible.