Sukhbinder Posted October 10, 2006 Report Share Posted October 10, 2006 Hi guys, i have a cordless drill/driver (make TGF china). it uses a transistor to control the speed of the drill/driver along with the trigger control. th emore u press the trigger the faster the rpm. the transistor is a TO-220 style package with A514 written on it (which i presume is 2SA514 as japanese transistors are usually named). any one having a its datasheet. i need to know how much power the transistor can handle. the power supply of the drill is from a 7.2v NiCd battery (6x1.2V cells each rated at 1200mAh).thanx ;) Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted October 11, 2006 Report Share Posted October 11, 2006 Hard one. Here is a stab.2SA514http://www.hiroo-elec.com/products/H-P.htmFZT951 = 2SA514 http://www.zetex.com/3.0/pdf/FZT951_fzt953.pdf Quote Link to comment Share on other sites More sharing options...
Sukhbinder Posted October 11, 2006 Author Report Share Posted October 11, 2006 thanks for the links, but there is still a problem, the FZT951 is an SMD transistor and the 2SA514 is a TO-220 style transistor, i don't think that the FZT951 can handle the current to drive a 7.2V motor in a cordless drill. maybe i'll look for a substitute in the TIP series on pnp transistors. can a MOSFET be used in its place? Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted October 12, 2006 Report Share Posted October 12, 2006 Could it be an SCR?http://www.southgatearc.org/techtips/drillspeed.htm Quote Link to comment Share on other sites More sharing options...
Sukhbinder Posted October 13, 2006 Author Report Share Posted October 13, 2006 thanks for your idea but i don't think that it is an scr. i can't see a diac or so connected, all i see is a 7.2V battery connected through a trigger button ( which itself regulates the speed of the motor). the transistor is connected to the trigger button and the trigger button assembly also has a polarity reversal switch so that the motor can work as a screw driver also. maybe i'll try out the TIP127 darlington PNP transistor, it can handle curremts upto 5A Quote Link to comment Share on other sites More sharing options...
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