Radio control transmitter

A radio control transmitter comprising:

• an encoder circuit for encoding a stick operation signal;
• a radio-frequency circuit for modulating the signal encoded and outputting it in the form of a radio wave;
• a first switch connected between each of said encoder circuit and high-frequency circuit and a power line;
• a second switch connected between said encoder circuit and a first line connected to an external power supply;
• a power switch connected between a power supply and said power line;
• a power feed discriminating circuit for judging which of said first line and power line is serving for power feed;
• a holding circuit for holding a signal output from said power feed discriminating circuit;
• a power control circuit for controlling said first and second switches depending on a signal output from said holding circuit;
• a third switch for selectively applying one of the output signal of said encoder and a signal of a second line to said high-frequency circuit;
• a third line connected to an output terminal of said encoder;
• a connector for external output to which at least said first, second and third lines are connected;
• a power output from said first switch being fed through said second switch to said first line;
• and
• a diode connected in a forward direction to said first line so as to feed a power therethrough to said holding circuit and power control circuit.