ok, but i already built rc transmitter and receiver circuit, but only with four control switch. i want to know HOW TO ADD MORE 12 CONTROL SWITCH TO IT????
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http://www.rentron.com/Files/ht-12e.pdf
If you don't understand it then I am afraid either your not going to be able to do this OR you have a steep learning curve ahead.
Building RC control is hardly ever worth the cost and bother getting it working
trust me it isn't easy getting RF circuits to work.
See Steve's answer.