On Friday, April 20, 2012 05:19:30 PM Viesturs Lācis did opine: > 2012/4/20 Dave Caroline <dave.thearchiv...@gmail.com>: > > Measure the base voltage in the two states relative to +5 > > It changes from +5,07 VDC to 0,60 VDC. +5 actually are +5,17, so it > means that base voltage swings from -0,1 to -4,57V, relative to +5V. > But it does not work, even if I connect the base straight to GND, > which gave base -5 V, relative to +5. > > 2012/4/20 Dave Caroline <dave.thearchiv...@gmail.com>: > > a common mistake is to assume collector is the middle pin like the npn > > but its the base > > I checked for the errors in connections at least 4 or 5 times, > especially not to mix up collector and emmiter, I knew that the base > is in middle, but never found anything.
That data sheet pdf you gave the URL of doesn't say that. Looking at the top side, epoxy face of it with the legs hanging down, the left leg is #3, the emitter. The center leg, #2, is the collector, and the right leg, #1 is the base. Be aware that the center leg is also going to be tied to any heat sinking used unless a sheet of mica is interposed. That shaded area on the other side, the exposed metal as in the right image on page 3, shows the metal heat spreader, which is likely a direct connection to the collector of the transistors die as its all one stamping. To do otherwise makes a very poor heat path to get rid of the heat. That said, driving that relay, heat isn't going to be any higher than about 30 down on the list of priorities for this. Heat sinking not needed IOW. > Diode also is soldered > correctly (the light stripe on diode's case is on the transistor's > side). > > What else could possibly wrong? > > Viesturs > > ------------------------------------------------------------------------ > ------ For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> He who slings mud generally loses ground. -- Adlai Stevenson ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
