Hi,
I put together a little JFET curve tracer for my scope in XY mode but managed to burn the pot wiper to control the Vgs level.
Wondering if anyone can see an obvious flaw in my design?
Thanks,
G
***EDIT***
Shoot, I think I should have wired the 18Vdc supply in reverse polarity as the gate actually needs to be at a lower potential than the source...
MPF102 Igf(max) = 10mA so I can see why this would cause the JFET to fail but why did this cause the pot wiper to fail?
Sources:
18Vdc @ 1A wallwart (DC)
7.5Vrms @ 200mArms wallwart (AC)
http://imageshack.us/photo/my-images/845/octopuscircuit.png
I put together a little JFET curve tracer for my scope in XY mode but managed to burn the pot wiper to control the Vgs level.
Wondering if anyone can see an obvious flaw in my design?
Thanks,
G
***EDIT***
Shoot, I think I should have wired the 18Vdc supply in reverse polarity as the gate actually needs to be at a lower potential than the source...
MPF102 Igf(max) = 10mA so I can see why this would cause the JFET to fail but why did this cause the pot wiper to fail?
Sources:
18Vdc @ 1A wallwart (DC)
7.5Vrms @ 200mArms wallwart (AC)
http://imageshack.us/photo/my-images/845/octopuscircuit.png
Last edited: