Description
This is a two part infrared remote controller circuit that consists of a transmitter and a receiver circuit pair. When you push the button on the 9V supplied transmitter circuit, a signal at 38kHz frequency is applied on the Infrared (IR) LED. As a result of the current passing through the IR LED, it illuminates the surround with infrared light. By using the 1k potentiometer, oscillator frequency should be adjusted to 38kHz to operate the circuit properly.  Figure 1. Transmitter Circuit The illuminated infrared light is detected by the IR receiver module. Generally IR modules has three pins and in our project we used the product of Telefunken, TK19 module. Instead of TK19, as an option you can use the SFH506 which is a product of Siemens or any other module for this purpose.
 Figure 2. Receiver Circuit When the IR light touches the receiver, the third pin of the module sees logic-0 (low). Other case it is in the logic-1(high) position. So controlling the third pin gives us the information whether the button on the transmitter is pushed or not.
The J-K type flip flop in the receiver circuit controls the relay. When the button is pushed, relay gets in the position closed which was in open position before. So the device gets connected to the mains and starts operating. After second push, relay gets in position open and cuts the device energy. 
Figure 3. Operating Diagram The controlled device may be a light or another device like a heater, a radio etc. The voltage supply of the receiver circuit can be designed basically with a 12V ac/dc adaptor and a 5V regulator for example 7805. 
Figure 4. Component Pins
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