Hello!
I am trying to build a variable dual power supply, and I think I have most of the circuit planned out. however the only thing I do not have planned is how to get the power supply to supply voltages less than 1.25V. I have read online that in order to do this instead of starting the LM317 at 0v to whatever you max out at, instead you start from -1.25V, is this correct? If it is how do I do this? The only way I know how to produce a negative voltage off of the top of my head is to reverse the power entirely, but then I would only be able to give the control pins negative voltage only.
I am trying to build a variable dual power supply, and I think I have most of the circuit planned out. however the only thing I do not have planned is how to get the power supply to supply voltages less than 1.25V. I have read online that in order to do this instead of starting the LM317 at 0v to whatever you max out at, instead you start from -1.25V, is this correct? If it is how do I do this? The only way I know how to produce a negative voltage off of the top of my head is to reverse the power entirely, but then I would only be able to give the control pins negative voltage only.