Home › Forum › Ask A Member › How do Atom Computer Ignition modules work? › Re: How do Atom Computer Ignition modules work?
June 20, 2017 at 3:21 am
#59987
Joe,
Both the BD649 and the BU931 are NPN Darilington transistors, the only difference is the CE voltage levels. I am going with the 931 because it is rated at 400v max not 100v for the 649. I am afraid that the low voltage level of the 649 will limit the output voltage of the magneto with increase in the magnetic field. Being in the electronic service field I also know how important is is to get the heat out of the device. So you can also place the collector tab of the 649 to ground to remove the heat generated.