JFET current source
JFET transistor can easily be wired as a current source. First off, by having the drain more positive than the source, and then shorting (direct connection between) the gate and Source, you get the JFET’s IDSS. The IDSS is about the JFET’s maximum current that it will allow to flow from drain to source, which is highly variable among JFETs. Additionally, a resistor can be added to the Source terminal. The resistor’s value determines the reduction in current from the IDSS. Unfortunately, each JFET part number has a range that IDSS can be.
First video: Transistor circuit 16 J310 n channel depletion JFET current source demo and multimeter measurements Click here to watch directly on YouTube!
Second video: How to use a trimpot variable resistor to manually adjust J310 JFET current source on a breadboard Click here to watch directly on YouTube!
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