I am trying to come up with a circuit that will allow me to alter the 0-1.0v lambda sensor signal to read from 0-.5v on the low side to 1.0v maximum. This will be used for fuel control in a hydroxy supplemented gasoline powered vehicle. So far I can only get the low end to read .224v with maximum of 1.0v. VR2 and VR4 set max output when a 1.0v signal is applied, and VR1 and VR3 are my low end adjustment. Can anyone help me get the voltage on low end to be adjustable from 0-.5v while still maintaining the 1.0v max output? Building circuits I am good at.....designing is another story entirely. Thanks in advance for any help.