Operated either by AC or DC, this Radio frequency based remote controller usually controls the load, may be two or more, situated at certain distance from controller. this systems is based on functioning of two major parts viz. i) The transmitter ii) The receiver. The basic operation that controls this system are modulation and demodulation. Modulation is the basic part of transmitter whereas the demodulation is placed in the receiving part of the system. The objective of the system is controlling the load that are in the receiving part by triggering it by sending RF through transmitter. As the result, the system will be acting as a remote controlled device. the system is to be established with the help of communication link i.e. radio frequency. the required is set up by considering the type of load and the distance of the receiving unit. Initially the circuit is designed for two loads. however the number is load can be incremented as desired.
the transmission section deals with sending the signal for controlling load.. The transmitter usually comprises of
i) Oscillators,
ii) Modulator
iii) Filter
The loads are fixed with their desired modulating frequency. The desired carrier frequency is set up for signal transmission.
The receiving section comprises of units for amplifying, demodulating and filtering. Which sends required signal to respective loads for carrying operation after verifying it. It also comprises of logical circuit for controlling the loads. The demodulation operation is carried by the FM receiver and the logic circuit controls the desired sequential operation for loads.
