Tonepad Small Clone Question

[Kyle Agee]

Has anyone any idea what transistors go where on the small clone pcb board.  they aren't numbered, nor are the labeled on the wiring diagram.  Slightly agravating.  Any help would be appreciated.

Here is the link for the file

http://www.tonepad.com/getFile.asp?id=8

Thanks

Kyle Agee

[Aharon]

When you have the pdf in front of you magnify it until you can see the arrows in the transistor drawing.
The one with the arrow pointing towards the base should be the PNP(2N5087),the other two are NPN(2N5088).
Aharon

[Lonestarjohnny]

If you'll print out the layout and position your board to the layout you should have no problem's seeing where everything goes, the layout has all value's drawn in on each item on the board, should be a SlamDunk for ya if you lay the 2 side by side and just follow the board lay out, but if you have a problem seeing this, i'm sure someone will help you
Johnny

[Kyle Agee]

Aharon:

Which side are you calling the base, i would assume that it is opposite to the pots, but when you refer to the arrows, do you mean the small arrow pointing to one of the leads, and if so, they all point in the same direction.  or do you mean the way the "y" with a line through it points.  I guess what the question is, is what is the base, and what is the arrow.  [/img]

[travissk]

Kyle:

A transistor has three terminals: in this case they are the Base, Collector, and Emitter. The "Base" pin is the one in the middle.

Here are the two relevant datasheets in case you want the long answer:
http://www.onsemi.com/pub/Collateral/2N5087-D.PDF
http://www.onsemi.com/pub/Collateral/2N5088-D.PDF

If you look at the picture of the symbol for the transistor, you will see that the NPN and PNP have the arrow going in different directions. This is due to the way the junctions are laid out inside the transistor, but essentially, you can go by the phrase I picked up at one of these stompbox sites:
PNP = "pointing into part"
NPN = "not pointing in"

So the 5087 is PNP and will have the arrow going in
and the 5088 is NPN and will have the arrow pointing toward the emitter.

Zooming into the tonepad layout, one transistor has the arrow pointing into the middle, and the other two

The one on that is the furthest left in the pdf is the 5087, and the two to the right are the 5088's. The lone 5087 is just above the 100k trimpot and is right next to that little crosshair symbol.

In the future, good ways to differentiate unknown components are:
-What are the connected to in the schematic, and what are they connected to on the layout (follow traces)?
-How many of each do I have, and how many arrows-in/arrows-out are on the layout?
-Datasheet search
-Ask the forum

Hope that helps!