MartinT 0 Posted December 11, 2002 Hello fellow Tamiyans! I just bought the XB HUMVEE, wow! I'I have replaced the speedcontroller with an ESC and I'm going to put in a speed 500 motor. So far so good..[] But on the transmitter that came with the set, which is alomost like a futabatype 2pc magnum sport, they left the charging connector out (probably to reduce cost). On the designated spot there is only a covered up hole. Does anyone know how to, or has a schematic how to install the charge connector myself? Thanks, Martin PS. great that the full instruction is in the database, it's a great help to get an understanding of the works of the machine! Share this post Link to post Share on other sites
WillyChang 1814 Posted December 13, 2002 No official schematics available, but it won't be hard to splice in a common DC connector into the empty hole. On original Futaba 2PCKA, the socket is connected to the battery contacts below. The power switch is 2-pole which disconnects the charger input to the battery when the radio is turned on - ie you can't charge & have TX on at same time, the charger cannot power the TX by itself. I don't know if there's any diodes or resistors between the socket and the battery contacts. I just charge mine (loaded with 8 nicads) with a 1975 Futaba charger and it works fine. Share this post Link to post Share on other sites
MartinT 0 Posted December 14, 2002 I fixed it, the PCboard has the provisions for a chrg conn and a diode right by the covered up hole, it works great! Only thing is now the Tx runs on 9.6V (8 Nicads)instead of the 12V (8 alkaline batteries) , but so far it does not seem to affect performance (although I have not done a max range test though) Greetz, Martin[] BTW The speed went up from 19.7 to 26.2 km/h with the new motor an a std batterypack; of course this is still peanuts for all you speedracers out there, but enough for a beginning RC driver[] Share this post Link to post Share on other sites
mr_lister999. 3 Posted December 14, 2002 don't worry about the voltage drop, its not really an issue. When the normal batteries are used, their voltage drops anyway to similar what the ni-cd's are. Every racer at the clubs nowadays use ni-cd (or ni-mh's) in their transmitters as it is much cheaper over time. Share this post Link to post Share on other sites
WillyChang 1814 Posted December 16, 2002 Ya, my PC2KA works fine on 8AAs, no reduction in range (nitro car, so being pedantic I checked). The AAs run the TX for about 4-5 hrs no problems, I think they're only basic 500mAh ones anyway. The older Futabas actually had special AA holders where you would use either 7x alkalines, or 8x nicads. Those were the days... [] Share this post Link to post Share on other sites