extruder controller - BSS84?

[John D'Ausilio]

I'm working on a BoM so I can build up another extruder controller
next week, and there's a reference in the parts list to a BSS84 ..
this could be any number of FET packages, but the real problem is I
don't even see it on the schematic or a place for it on the pcb!

Anyone know what the deal is?

[Andrew Plumb]

Which schematic for which extruder controller?

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Me: http://clothbot.com/wiki/

[John D'Ausilio]

3.6, and using the schematic on the wiki page ...
http://wiki.makerbot.com/thingomatic-doc:extruder-controller-3-6

actually this is OBE as the cost was going to be about the same as
getting one from Denmark .. so I decided to be lazy and just ordered
one built ;)

[Andrew Plumb]

It's the little three-terminal "T1" transistor between IC7 and L1, next to the FT232RL on the LHS of the board:

http://www.flickr.com/photos/makerbot/5239144255/

Andrew.

[John D'Ausilio]

ah yes, I see it now ;)

well, I've got a complete DigiKey BoM for the board if anyone wants it
.. I've substituted a slightly larger pin-compatible MOSFET due to the
fact that the original one is discontinued

[Jeffrey Ballard]

If you ordered it on eBay from that guy in Denmark the electronics I ordered from him were not the equivalent of makerbots.  They seam to be etched by him, components are rearrange, some are missing all together.  I can post actual comparison photos if you'd like

[John D'Ausilio]

hmm .. I'd be interested in that info .. so does it work ok?

[Mark Cohen]

Please post pictures.

Thanks!

Sent from my iPhone

[John D'Ausilio]

he seems to have nothing but good feedback ...

I went ahead and bought the parts after all ;) $60 shipped + $8
shipped for the board isn't bad for single-piece pricing ... thats
with an Atmega328 and upgraded MOSFETS
I hope my paste isn't too old ...