Coordinating Transistors w/ Schematic

stebnera

Member
Messages
36
In the following schematic, how do I identify which legs are the emitter and collector (all but Q5)? I'm assuming the center post is the base?

With Q5, the replacement NTE JFET that cross-referenced the part number on the schematic (which was also the part number on the old one in the circuit board) has 4 legs: case, source, drain, and gate. Which legs are which on the schematic, and do I need to ground the case, or can I clip it's leg? The original is plastic w/ 3 legs, the replacement has an aluminum housing.



Thanks,
Aaron
 

Rosewood

Member
Messages
1,864
The leg with the arrow is the emitter, the one in the middle base, and then you have the collector.
 

booj

Member
Messages
173
On Q5, th bottom leg is the Source. The middle leg is the Gate. The top is the Drain. I'm not familiar with a 4 legged fet.
 

stebnera

Member
Messages
36
thanks much guys. I'm by no means an expert obviously, but there's no doubt the 4th leg is wired to the aluminum housing, my guess is that it's supposed to be grounded? Kind of like a shielded cable? I have no idea, obviously, but it seems to make some sort of sense to my mechanical engineering mind, which can be scary when talking electronics... anyway here's a link to the piece http://www.nteinc.com/specs/400to499/pdf/nte459.pdf
 

BassHog

Member
Messages
96
Aaron,

You can still get the original 2N5459 from many places.
Here is a link to the part at Mouser.com

http://www.mouser.com/search/ProductDetail.aspx?R=2N5459virtualkey51210000virtualkey512-2N5459

They are all of $0.14 each.

That looks like the Earth Revival schematic ;)

I probably even have a few of these in my parts bin somewhere from my last Revival rebuild if you need one.

Scott.

P.S. Sorry I haven't got back to you on your PM's yet...I Have just been super busy
 




Trending Topics

Top