I have never used a Mosfet before. (3)|Source-----757 Lamp--- + 12V +12v & 0v-----100 ohm------Gate(1)| (2)|Drain -------------- -12V Common (0v) IRF540N Mosfet The 757 Lamp is 24v, glows dim on 12v. Should this circuit switch the lamp on & off? Am I blowing another Mosfet each try? Do I have the right pinout? Or is it I have a bad batch of '540N's from EBAY? John Ferrell 6241 Phillippi Rd Julian NC 27283 Phone: (336)685-9606 Dixie Competition Products NSRCA 479 AMA 4190 W8CCW "My Competition is Not My Enemy" ----- Original Message ----- From: "rad0" To: Sent: Thursday, February 13, 2003 12:04 PM Subject: [ee]: how do you calculate the resistor for an open drain? > unfortunately I need to go over this again > > I am trying to hook up an I2C A/D converter, > and the SDA and SCL lines show a 2K resistor > on their example, but the example is using 2.7 to 3.6 vdc > supply. > > So, this can't be what's needed for a 5 vdc supply, can it? > > thanks > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.