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This video discusses the JFET current source / limiter circuits, illustrating the very simple circuit structure, its operation, and the pros and cons of these circuits. The background videos that may be helpful to review would be:
Intro to FETs:
• #219: Back to Basics: ...
Transistor (BJT) Current Sources and Mirrors:
• #190: Back to Basics: ...
• #191: Beware of test e...
The notes from this video can be found here:
www.qsl.net/w2a...
BONUS! 50uA Current Source, like the one to calibrate Simpson 260 VOM, built using a single JFET and the cascode design, traced out on the curve tracer, including a zoom in to 1uA/div:
www.qsl.net/w2a...
The Siliconix AppNote on JFET current sources:
www.vishay.com...