#374: Back to Basics: JFET Current Source / Limiter circuits @w2aew

w2aew | #374: Back to Basics: JFET Current Source / Limiter circuits @w2aew | Uploaded October 2023 | Updated October 2024, 3 hours ago.
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:
youtu.be/oambDFa0Pr8?si=gdJTDa-F7z9F5GHR
Transistor (BJT) Current Sources and Mirrors:
youtu.be/xR0RfmmRhDw?si=e60AFMoc2qGG-HZi
youtu.be/JbCI4Lsnqho?si=y-6FlsQT0VZXRw7Q
The notes from this video can be found here:
qsl.net/w2aew/youtube/JFET-Current-Sources.pdf
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:
qsl.net/w2aew/youtube/50uA_curves.pdf
The Siliconix AppNote on JFET current sources:
vishay.com/docs/70596/70596.pdf

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