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Simple FM transmitter

Simple FM transmitter

Today we will build a circuit to create a very simple FM transmitter. This circuit like others is well publicized on the Internet and presents a very simple configuration since it only uses an NPN Transistor. Note that this circuit …

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Piano with 555

Piano with 555

Today we will build a circuit that uses the IC 555 along with buttons and resistances to play the 9 musical notes. This circuit has a wave generator 555 configured as an astable multivibrator circuit. This type of operation is …

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OhmMeter with Auto Ranging

OhmMeter with Auto Ranging

Today we will build two circuits to calculate the value of a resistor. The principle used in these circuits is the voltage division. The measurement is made with an analog port of a micro-controller. Hoje iremos construir dois circuitos para …

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Comparator - Night Light

Comparator - Night Light

In the circuit of this article we will build a voltage comparator using an integrated chip called LM393. The LM393 is a dual difference comparator. This means that you have two independent voltage comparators. The circuit compares the input voltages …

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Infrared Detector

Infrared Detector

In today’s circuit we will build an infrared detector. Additionally we will build a circuit to detect the type of frequency and to which manufacturer the codes belong. The latter uses an Arduino and a library to obtain this …

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Level Shifter

Level Shifter

Increasingly, when designing a circuit, we find components that operate at different voltages than the microcontroller. This requires that, to work with them, it is necessary to implement a level shifter, that is, to ensure that there is a transition …

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