2n4393

[jack]

hi to all
please help me
2n4393 in this circuit is a n-channel transistor or npn transistor???
please help me for similar
tank you

[Aziz]

Hi Jack,

it is a n-channel J-FET transistor (metal case type). The drain pin is going to the resistor (R24), the source pin to ground (0V). The gate is normally driven with negative voltage (referenced to source pin).

There is also a plastic type version: PN4393 (but could be different pin-out, check data sheet)

Aziz

[Op04]

Just want to add for this old thread,, especially for anyone who wants to build lobo, tgsl, cobra etc.. i put this data here for n channel jfet list, I hope this is useful

[WM6]

Thank you. Useful data collection.

[Op04]

Thank you. Useful data collection.

You're Welcome

[6666]

I use this GM328A meter to test nfets+pfets gives all parameters , very handy.

https://www.ebay.com.au/itm/GM328A-A...wAAOSwQaheayAU

[kt315]

yup. good, have to say you the version on smd has small bug but correctiable easely.
al least i did read feedbacks of russian guys about that.
try measure a frequency. if you do not see digits that sure the bug is.

[nonkapo]

I use one of these already three years with the only issue it begin restarting randomly. Still working though. Will check for the bug if present as so far i never measure frequency with it. Was not aware it can do even;-)