Normally, home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous. The circuit [[wysiwyg_imageupload::]]described here requires no physical contact for operating the appliance. You just need to move your hand over the light dependent resistor (LDR). The device connected to it switches “on” when you put your hand over the LDR and remains “on” until you again move your hand over it.The circuit is based on two ICs: one is operational amplifier LM741 and JK Flip Flop CD4027. An op-amp produces an output voltage that is hundreds of thousand times larger than the voltage difference between its input terminals. CD4027 is a master slave JK flip flop IC which works in toggle mode. Here this IC can be used to change the state by the signal applied to one or more control inputs and will have one or two outputs. CD4027 has four inputs namely J, K, Set and Reset and it contain two outputs namely Q and Q bar (Q not).
Understanding JK flip flop using CD4027
CD4027 is a common JK Flip flop based IC and if often used as data storing element. It contains two identical or symmetrical JK flip flop. Individual set of flip [[wysiwyg_imageupload::]]flop has provision of pin like set, reset, clock input, J, K and complementary outputs. JK flip flop can be used in applications like registers, counters or as control circuits. CD4027 is a master slave JK flip flop IC which works in toggle mode. Here, this IC can be used to change the state by signal applied to one or more control inputs and will have one or two outputs. In this output not only depends upon the current input. A flip flop is mostly used in computer for its memory circuit. In this circuit, both are opposite of each other for example voltage on Q bar is zero means Q should be having higher voltage.
Sound Operated Switch
Detailed here is a circuit which will switch ON the light by just listening your clap sound. Another advantage of this circuit is that you cannot get any electrical [[wysiwyg_imageupload::]]shock as we did not have to use any mechanical switch.The circuit is based on two IC :operational amplifier LM741 and JK flip-flop based CD 4027.An op-amp produces an output voltage that is hundreds of thousand times larger than the voltage difference between its input terminals .CD4027 is the master slave JK flip flop IC which work in toggle mode. Here, this IC can be used to change the state by signal applied to one or more control inputs and will have one or two outputs. CD4027 has four inputs namely J, K, Set and Reset and it contain two output namely Q and Q bar(Q not).
CD 4027 Based Emergency Lighting System
Described here is a CD 4027 hearted, battery employed circuit that serves as a solution for light and fan during the times of extreme humidity or power cuts. The circuit consists of a LED light and small DC fan which can sufficiently work for one person. The main advantage of this circuit is one can use any one or both devices at a particular time. The circuit does not consume much power so one can expect it work for a good amount of time. This circuit is based on CD4027 IC which is the most commonly used JK flip flop IC. CD4027 is the master slave JK flip flop IC which works in toggle mode. Here, this IC can be used to change the state by signal applied to one or more control inputs and will have one or two outputs. In this circuit, output is only depended upon the current input.