BGE reviews several alternatives for a battery open-circuit monitoring device to protect from a dc supply single point of failure. The Federal Energy Regulatory Commission issued Order 867 on Jan. 23, ...

Japanese researchers claim that tin sulfide solar cells could achieve higher open-circuit voltages by preventing "Fermi level pinning" from occurring, due to the addition of a tin sulfide ...

Note that the open loop requires at least 1 mA of current for the open indication to function, which is below the normal 4 mA—a “zero” output condition for this type of control system. Response time ...

Qucs is a GPL circuit simulator. And if you want the GUI option, you might want to try out QucsStudio, which uses Qucs under the hood, and is free to use, but binary-only.