# Analog Circuits

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Let us discuss about the stimulation of analog circuits using KTechLab

## Half Wave Rectifier

As a first experiment, obtain the wave form of a half wave rectifier.First select an a.c source from the Components sidebar(section SOURCES). Select diode, resistance and capacitor from section Discrete and CRO from the Outputs. Make connections as shown below.

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The output wave form is obtained in the CRO and it is displayed in the window below.

## Characteristic of a Capacitor

Now study the Characteristic of a Capacitor Using KTechLab. First make the circuit as shown in the below figure. Enable CRO, then charge and discharge the capacitor by using the switch. Observe the wave form. Change the capacitance and study the different curves obtained.

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## Oscillator

Now we see how oscillations are produced in a tank circuit, connection diagram is shown below.

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Charge the capacitor by pressing the switch and releasing it. Once the capacitor is charged, one plate of the capacitor has more electrons than the other. When it is discharged through a wire, the electrons return to the postive plate, thus making the capacitor’s plates neutral, or discharged. However, this action works differently when you discharge a capacitor through a coil. When current is applied through a coil, a magnetic field is generated around the coil. This magnetic field generates a voltage across the coil that opposes the direction of electron flow. Because of this, the capacitor does not discharge right away. The smaller the coil faster the capacitor discharge. Now the interesting part happens. Once the capacitor is fully discharged through the coil, the magnetic field starts to collapse around the coil. The voltage induced from the collapsing magnetic field recharges the capacitor oppositely. Then the capacitor begins to discharge through the coil again, generating a magnetic field. This process continues until the capacitor is completely discharged due to resistance.

## Resistor

Find the current through the resistance when connected in parallel and serial mode.Connection diagram is given below.

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