# Welcome to Electronics Area

## Wirewound Resistor

A wirewound resistor is used when the power to be dissipated is very high. A wire wound resistor is usually coated with a layer of vitreous enamel.

## Light detector circuit using LDR (automatic night light)

This circuit activates a lighting device through a relay when the intensity of daylight is no longer sufficient. Good for illuminating the main entrance of the house, a display case that needs to be kept lit at night, an unsafe area at night, etc.

## The Decibel – Voltage Gain & Power Gain

Voltage gain and Power Gain on an Amplifier – Explanation and formulas. The decibel expresses a ratio of quantities, not a quantity itself.

## Blown Fuse Indicator Circuit using one transistor

This single transistor blown fuse indicator circuit warns us by lighting a LED when there is a problem in an electrical installation protected by the fuse.

## Logic Probe using NOT Gates

A very simple logic probe using NOT gates. The logic probe allows us to know the logic state of any point in a digital circuit. The signal to be measured is applied to the probe tip input.

## Resistors in Series – The Equivalent Resistance

Series resistors are those that are connected in series and have the same current flowing or circulating through them

## How to increase the output voltage of 78XX regulators?

How to increase the output voltage of 78XX regulators. How to use a zener diode to boost the output voltage on a 7805, 7809, 7812, 7815, ….regulators.

## Mesh Current Method – Steps to follow – Example

The mesh current method is very useful for finding all the currents in a network. This method, a little more advanced, is also applied to circuits where there are resistances and reactances.

## Emergency Lighting Circuit with LEDs and Rechargeable Battery

This circuit is very interesting because, unlike emergency lighting circuits that use incandescent bulbs, it uses high-efficiency LEDs.

## Node Analysis Method – Steps – Example

The node analysis method also known as the nodal analysis is widely used to solve linear resistive circuits (this method, in a slightly extended form, also applies to resistive-reactive circuits)

## Voltage Divider – Voltage Division – Series Resistors

The voltage divider is a circuit that allows us to obtain an output voltage less than the input voltage. The output voltage is normally obtained across ground and the resistor connected to it, but it could be across any of the other resistors.

## Maximum Power Transfer Theorem Explanation

What does the Maximum Power Transfer Theorem say? “The maximum power transfer to the load is obtained when the load resistance RL is equal to the internal resistance of the…