Alternating Current (AC)

 

Alternating Current (AC) Tutorials


Wien-bridge Oscillator with Op Amp

The Wien-bridge oscillator, consists of an Operational Amplifier (OA) in a non-inverting configuration with gain 1+R2/R1 and a RC feedback network

Phase Shift Oscillator

The phase shift oscillator is a negative gain amplifier (-K) and a feedback network consisting of a third order RC section in cascade

LC Oscillator – Inductance – Capacitance Oscillator

LC oscillator: Inductance – Capacitance Oscillator A simple oscillator can be built with an amplifier stage and an inductive-capacitive network (LC) to provide an offset of -180°. The oscillation frequency can be freely adjusted…

What is an Alternating Current?

The difference between an alternating current and a direct current is that a direct current only flows in one direction. Alternating current circulates in one direction, then the opposite direction, and repeats this process continuously.

Power in AC Circuit

Electric power. Electrical power on a circuit with reactive load (reactance). How to obtain the current in a circuit having resistance and reactance.

Series RC circuit connected to an AC voltage

In a series RC circuit, the current through the resistor and the capacitor is the same. The voltage VS is equal to the phasor addition of the voltage drop across the resistor (Vr) and the voltage drop across the capacitor (Vc).

Resonance in an RLC Circuit

Resonance in RLC Circuits is a special condition for parallel and series RLC circuits, when capacitive reactance and inductive reactance have the same magnitude and cancel each other. This only happens at frequency fo.

Push – Pull Amplifier – Push – Pull Amplifier Operation

Push – Pull Amplifier

A Push – Pull amplifier is called that way, because it uses 2 groups of transistors and only one works at a time. One group pushes in one direction while the other pulls in another direction. Each group is responsible for amplifying a single phase of the input wave.

Parallel RC circuit

Parallel RC circuit

Voltage, Currents, Phasor diagram & Impedance. Voltage is the same on the capacitor and resistor. Current is ahead of the voltage in the capacitor