Question about JFET switching circuit

Discussion in 'Homework Help' started by chenron7, Apr 2, 2018.

  1. chenron7

    Thread Starter New Member

    Mar 29, 2018
    13
    0
    Hello :) Im tring to analyze a circuit and it has this switching circuit that I dont really understand (especially the diodes part ).
    Can anyone help me ? Thanks !

    Capture d’écran 2016-02-04 à 13.36.18.png
     
    Last edited by a moderator: Apr 2, 2018
  2. Sensacell

    Moderator

    Jun 19, 2012
    2,388
    775
    What is the nature of the signal?
     
  3. chenron7

    Thread Starter New Member

    Mar 29, 2018
    13
    0
    electric guitar
     
  4. Jony130

    AAC Fanatic!

    Feb 17, 2009
    4,901
    1,377
    Do you have better quality (large) schematic?
     
  5. chenron7

    Thread Starter New Member

    Mar 29, 2018
    13
    0
    attached

    Capture d’écran 2016-01-18 à 11.35.07.png
     
    Last edited by a moderator: Apr 2, 2018
  6. Jony130

    AAC Fanatic!

    Feb 17, 2009
    4,901
    1,377
    It seems that the JFET is ON when the gate is left floating via D1 (D1 prevents the JFET gate to channel diode to conduct) and a positive voltage at the FS2 point. And when FS2 is at ground the JFES is OFF.
    I suspect that the 10μF capacitor was add to slow down Turn ON and Turn-OFF time used to prevent "pop sound" when switching between ON/OFF.
    And it is a mystery to me why they add into the circuit the D2+100k resistor in parallel with the 1k resistor.
     
Loading...