Main > Main Forum
Super bright LED driver board for I-PAC
<< < (9/12) > >>
Frostillicus:
thanks - I picked up 2 transistors already - they are rated for 40V for 'collector-emitter', 40v for collector-base, but 5V for emitter-base.  would this one work? It's pretty big(has a little heat sink connected to it).

So if I use a separate power supply, should I connect the cathodes to both the powersupply negative and the gnd on the IPAC?
OSCAR:
Those transistors should work just fine.  I would connect the cathodes to the power supply ground, and only pull the signal connections from the I-PAC like I did on mine.
Frostillicus:

--- Quote from: OSCAR on March 30, 2003, 02:29:01 pm ---Those transistors should work just fine.  I would connect the cathodes to the power supply ground, and only pull the signal connections from the I-PAC like I did on mine.

--- End quote ---
I just have one last question - doesn't there need to be some return connection to the IPAC ? wait ...here I drew this(it's sloppy) out for one of the circuits:

I know the symbols aren't right...but are the connections correct?
OSCAR:
That looks fine to me.  The transistor is just looking for a signal on the base (it acts like a switch) so it will allow the current to flow from the emitter to the collector in the case of a PNP transistor.
Frostillicus:
cool - I just don't want to fry anything $$$ like my ipac4 :)  Thanks for the help
Navigation
Message Index
Next page
Previous page

Go to full version