I'm working on a new test fixture that has to drive several lines with a switched voltage. As happens with test fixtures, bad parts or bad connections can short these inputs, so I want to make a current limited switch, with a limit of perhaps 125 mA. As I'll need lots of these I'm looking for something small and inexpensive.
What I've come up with is using an old school LM723 voltage regulator in the basic high voltage scheme, and adding a transistor to short out the NI pin to disable. The device is cheap at $.60 each, just a little large as it's only available in DIP packaging.
Does anyone know of anything else cheap and handy that could do this?
What I've come up with is using an old school LM723 voltage regulator in the basic high voltage scheme, and adding a transistor to short out the NI pin to disable. The device is cheap at $.60 each, just a little large as it's only available in DIP packaging.
Does anyone know of anything else cheap and handy that could do this?