1. Test gear......Saturation testerII

    It's fairly easy to measure the inductance of things in the junkbox or check one you have just made but what about the saturation current ?? Well eventually I was forced to make a tester and am very pleased I did, well worth the effort and thanks to the junk box cost me nothing except time! It woks in conjunction with a DSO (If you don't have one go buy a good USB one at least, I use an OWON).

    A capacitor bank is switched across the coil under test by a MOSFET and the current observed ...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Saturation tester.JPG 
Views:	419 
Size:	355.6 KB 
ID:	6029   Click image for larger version. 

Name:	ETDxx_470uH_2mm.jpg 
Views:	352 
Size:	19.7 KB 
ID:	6030