# Category: Electronic and Circuit

## How to Make a Police Siren Circuit?

In this article, we create a police siren circuit using 555 timer integrated. This circuit smoothly rotates the output sound between two different tones/frequencies, similar to the sound emitted from police cars. You can also

## How to Make An Electric Piano Circuit?

In this article we will look at how to make an Electric Piano circuit using 555 timer integration and several other electronic components. This circuit consists of a series of push button switches (similar to

## Strobe LED / Police Flasher Circuit

The strobe LED, also known as the police flasher circuit, is a signal lamp consisting of a pair of LED groups, one after the other that flashes. And the purpose of this article is to

## Does the RC522 RFID Reader Not Work?

Some of the RC522 RFID reader modules, which are poor quality and generally bought cheaply, have reading and working problems. They do not read RFID Tags in the frequency range that they should be able

## New ATtiny Chip Series

In 2016, Microchip/Atmel announced an entirely new series of chips designed to replace the old ATmega and ATtiny series.The new ATtiny chips started with the 1 series ATtiny417 and ATtiny817, followed by a lower-cost series

## Complex Numbers and Phasers

In Electrical Engineering, the mathematical system used to combine resistors, currents or DC voltages uses the set of "real numbers" used as integers or fractions. But actual numbers are not the only type of number

## AC Resistance and Impedance

Impedance, measured in Ohms, is effective resistance to current flow around an AC circuit containing resistors and reactances. In previous lessons, we found that in an AC circuit containing sinusoidal waveforms, voltage and current phasers,

## AC Capacitance and Capacitive Reactance

The contrast to the current flow through an AC capacitor is called Capacitive Reactance and itself is inversely proportional to the feeding frequency. Capacitorsstore energy in the form of electric charge on conductor plates.When a