More recently, the symbol is often drawn without its circle even for discrete devices. The symbol is usually drawn without the circle when drawing schematics of integrated circuits. Officially, the style of the symbol should show the component inside a circle (representing the envelope of a discrete device). This symmetry suggests that "drain" and "source" are interchangeable, so the symbol should be used only for those JFETs where they are indeed interchangeable. The JFET gate is sometimes drawn in the middle of the channel (instead of at the drain or source electrode as in these examples). Unlike a BJT I think I remember reading about a JFET not caring about polarity.Ĭheckout the JFET symbols in the wiki that remove the ambiguity. IIRC this ambiguity might have been on purpose. I think the symbol for a JFET is ambiguous with respect to which terminal is the source and which terminal is the drain. Thank you so much for your time and if i need to upload a clip of the schematic and am capable of doing so with my low post count, I certainly will. Would he MPF102's in the form of a source coupled pair forming an oscillator have the drains connected, or am I misunderstanding the mirrored JFET symbol (with gate on right side, does D & S switch locations)? If I have not made my question too confusing, can someone please take a moment to help clarify my confusion. If my current interpretation of the schematic is correct, the drains of the two JFETs in this oscillator are coupled. I cannot seem to find a good representative image to help me decipher a source coupled pair like this. However, in my mind when it is mirrored and the gate is now on the right side of the schematic symbol, it's drain and source remain oriented the same as the other symbol (drain on bottom, source on top). I recognize the layout of the JFET with the gate on the left side, the drain on bottom and the source on top. Click to expand.Q2 is a mirrored version of the schematic symbol for an N-Chan JFET (Q1).
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