The circuit uses the CMOS dual D type flip flop CD4013 which contains two positive-edge triggered flip flop to toggle a load connected through a relay. Now [[wysiwyg_imageupload::]]with the help of a switch you can on the device once pressing it and off the device again using the same switch. In CD4013 each module is further equipped with a group of  pin outs assigned as data, set, reset, clock input and a couple complementary output Q and Q(not) . As we know it has couple of output that change or toggle state as response to trigger applied to input terminals. In this circuit, one is wired in toggle mode while other is not used.  Using this circuit we can easily control AC and DC appliances remotely through inexpensive low voltage cable and a standard push to on switch. This circuit can easily support a cable length of 25 meters.

From DIP, rotary DIP, and slide switches to tactile, rocker, push button, and toggle switches, there is a nearly limitless range of mechanical switches differing in size, shape, interfaces, and features. Although a relatively basic component in electronic design, each switch type has its benefits, drawbacks, and ideal use cases. Because all switches serve a…

SPDT stands for Single Pole Double Throw. It comes with 6 pin. It has 2 states ON and ON. For instance if we have two devices a red LED and a blue LED then SPDT switch will turn ON red in one position and blue in other position. By making different connections of the pins the two ON states can be made of same polarity or opposite polarity. Hence, it will switch ON a different device in each position. Hence, it is also known as changeover switch. This switch has found applications in industry, etc.