Posted by Tittu Thomas , 6/28/2012
RF TRANSMITTER SECTION
RF(Radio Frequency) is a High Frequency signal commonly used for communication applications, due to its high frequency we can transmit signal to a sufficient distance (about 300 Foots) without attenuation.
Here, the simple RF switching circuit is used to turn ON and turn OFF an LED (For Demonstration) you can replace the LED with a switching RELAY and control any appliances.
figure shows the circuit diagram of TRANSMITTER section
Let me introduce you the Main components used in this RF Transmitter Circuit.
- ASK TRANSMITTER
- HT 12E
- AN ANTENNA (ARIEL)
- SWITCHES - 2
- RESISTOR - 750K
- 6V BATTERY
It is an Encoder, which is used to code the signal generated in circuit, signal means ON and OFF position of switch S2. SWITCHES
The Transmitter section includes 2 SWITCHES, S1 and S2. Switch S1, is configured as Transmitter enable, this determines the condition of Transmitter. This should be always closed to transmit the signals. Switch S2, it is used as the control Switch to turn ON and turn OFF the LED.
RF RECEIVER SECTION
The RF RECEIVER SECTION includes,
- HT 12D
- Flip Flop IC - CD4017
- Transistor - BC558
- 6V BATTERY
CIRCUIT DIAGRAM OF RF REMOTE RECEIVER
It helps to collect the transmitted signals from RF TRANSMITTER through the antenna and give it to decoder input. HT 12D
It is the Decoder IC in the RECEIVER circuit, which will decode the information transmitted from RF transmitter. It is just reverse operation of the Encoder. FlipFlop IC 4017
It is a Flip Flop Ic, which will turn on for the first signal and turn off for the second. The working is same as that of a BI-Stable Multivibrator.
Categories:projects, simple circuits