That's pretty slick, although I would ground the relay to the negative side of the battery :)
I like it because most (ok, pretty much all) USB (and 12V) stuff that you'd be using are designed to have power go off and on, and either have a battery or just circuitry to deal with it. Then you would never be discharging the battery while idling; although all of off and on could get annoying after a while. On Apr 4, 2011, at 1:50 PM, Kurt Nolte wrote: > So, I whipped up a little 5-minute sketch of approximately what I was talking > about, with the relay/diode combo. I based it roughly off the excitation > circuit/warning light of an older car, just in reverse. > > I have a niggling feeling I'm missing something, but off the top of my head > I'm not really sure what it is. > > I feel it probably has to do with the diode's placement, or my choice of a > NO-SPST relay. > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to nighthawk_lovers@googlegroups.com. > To unsubscribe from this group, send email to > nighthawk_lovers+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/nighthawk_lovers?hl=en. > <Relay.JPG> -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
