adapter and bc547 with battery

[deepakgupta.rf]

hello sir
i m using 12 v 1 amp adapter and through bc547 i will get signal then i want to stop my adapter supply going toward my microcontroler kit and this bc 547 alsothen how i can do this.
but this bc547 is getting current by battery also then it is no problem but shud not have current from adapter only

please helpme

 

[debjit625]

I didn't understood,could you clear out your problems once again.Are you trying to control yout mcu kit using BC547 as a switch like switch over the power between main(power adapter) and battery.