Capacitors in series – Capacitors in parallel.

How to obtain the equivalent capacitance of series capacitors and parallel capacitors? Formulas and examples

Series/Parallel Resistor Reduction.

Resistors reduction can be done making some simplifications using resistors in series and resistors in parallel formulas.

Inverting Summing Amplifier using Op Amp

The inverting summing amplifier using op amp outputs a voltage equal to the sum of the voltages it has in its inputs. The following explanation is based on an adder of three inputs, but applies to an adder of any number of inputs

Electrolytic Capacitor

Electrolytic capacitors have been developed to achieve large capacities in small physical dimensions. To achieve this large capacity, a special dielectric is used.

NAND gate – Truth table.

NAND gate, also called universal gate, is a gate that produces a logic “0” output only when all logic inputs are “1”. Truth table.

Mesh Current Method in a Resistor Network

The Mesh current method is very useful to know all the current  in a network of only resistors. This method, a little more extended, is also applied to circuits where there are resistances and reactance.

What is a Millman’s Theorem?

Millman’s theorem is used to directly obtain the voltage between the ends of a parallel branch circuit. Equivalent Millman circuit Formulas, example.

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.

Why is the transformer core made of metal sheets?

Explanation of why the electric transformer has a core made of iron sheets. Eddy or Foucault’s currents

Capacitor charging process

Capacitor charging process shows the variation of voltage and current in the capacitor over time, when it is connected to a DC voltage source

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

What is a Truth Table?

The Truth Table is used to simplify boolean equations obtained from digital circuits. The truth tables can have many columns, but all tables operate in the same way.