The jumper is there in case somebody wants a 5v power supply for the radio and servo's. Most R/C ESC's are built with a 5v BEC for this reason. The typical R/C model doesn't run at 24 volts (7.2V is more typical). An average BEC circuit is just a 5v linear voltage regulator. These work by dumping voltage above their rated output voltage as heat. With a 7.2v model, were only talking 2.2v being dumped as heat which insn't all that much. With a 24v model were talking 19v of excess voltage going to heat.
In cases where you have two or more devices with BEC's in your model, you want to disable all but one. The one you leave enabled is usually the one with the highest amp output. They are disabled by snipping a jumper (if provided), cutting the red wire on it's "servo lead", or physically removing the voltage regulator from the device (advanced). You can also disable all BEC's and provide the 5v by a standalone battery or standalone BEC's circuit. Higher priced standalone BEC's use a switching 5v regulator which is more efficient than a linear in that they use pulse width modulation to regulate voltage instead of heat dump (much more efficient). Steve Tyng On Saturday, July 21, 2012 2:02:30 PM UTC-4, Aaron wrote: > > If the Scorpion Mini runs better without the jumper, why is it there at > all? Sorry, I just dont understand these things. > And after the snip, my 24v turret motor will not damage the ESC (provided > I use a chunk of aluminum for cooling)? > > Aaron "sorry for silly questions" Freeman > > -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat
