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The Linear Variable Capacitor and Its Characteristics The capacitor can change its capacitance unit linearly with our effect. This capacitor consist of a spring which on fixed plate, iron slug which connect to spring and moveable, and brass sleeve which is fixed too. When the iron slug changes its position, the capacitance will be change. And the sleeve fitted around the coil. The capacitance magnitude depends on the length of the iron slugs position. If the length which is slugs length in the sleeve increase, capacitance will be increase. Therefore we can change the capacitance what we need. Our experiment shows that the capacitance changing to be linearly. So when we do this experiment firstly we connect to what we need the connection our circuit. We look at our datasheet which is called Figure 3, and start to do connection. Our variable capaticance have input which connect to 40kHz oscillator and have output which connected A.C Amplifier. We set the amplifiers gain to 1000 and then we connect the 40kHz filter with amplifiers output. After, the full wave rectifier unit we connected to filters output in addition we connect to voltmeter whose other connection to zero the F.W. rectifiers output. In this way we complete the our circuit. After we finished the all connections, we start doing experiment regularly. We want to change our capaticance so our voltage will change and we understand that our capacitance were be changed. We measured the irons zero positions voltage and we turn the iron slug 1 round. And each one turn counter clockwise we reduce our output which shown as Table 1. After we obtain the table we want to see how the values decrease linearly or not. we can learn this when we graph our values using MATLAB as shown in Figure 1. Figure 1 In the last part of documentation I will tell what kind of capacitor there are and where we use this capacitor. Fistly there are two kind of this capacitor, mechanically controlled and electronically controlled. We can change with our hand in the mechanically one and small operations can be done. But they are chipper than electronically one. And the mechanically controlled capacitors have many different kind such as butterfly, multiple sections, spilit stator. The electronically one is the more advanced one because we can controlled very small units. In addition the digitally one using all of the life. There are many using area such as microphones, switches, industrial sensors. Engin KAYA 040100672