Junction Field Effect Transistor – JFET

 

JFET N Channel J310 depletion mode current source sink circuit learning electronics lesson 0058
JFET N Channel J310 depletion mode current source sink circuit learning electronics lesson 0058

Junction Field Effect Transistors (JFETs) are commonly used as a current source/sink.

  • Drain
  • Gate
  • Source

Connecting the gate directly to the source provides the Idss. Which is the maximum current that a particular JFET will allow to flow through it.

A resistor between the gate and source will lower the amount of current based on the Idss and the amount of resistance used.

JFETs come in N channel and P channel. The J310 is relatively common N channel JFET.

N channel gate arrow points into the component schematic, whereas the P channel JFET schematic symbol points out of the schematic symbol.

Video:

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