The dBm sometimes called dBmW or decibel-milliwatts is an abbreviation for the power ratio in decibels (dB) the measured power referenced to one milliwatt (mW) ( see Conversion Table below ). It is used in RF and fiber optic, as a convenient measure of absolute power because of its ability to express the very large values ...Continue reading..
Tag Archives: Converter
This is a converter circuit receiving ( also called convert ) signals 440 MHz for 144 Mhz, it is quite simple and can be used in a common HT. With it you can receive amateur frequencies of the band 70 Cm ou 440 Mhz. To use this converter reception you will need a ...Continue reading..
Often we are looking for ways to make our lives easier, in electronics is no different, mainly hobbyists and the lazy who do not want to be making calculations, end up looking for more practical solutions and perhaps even more efficient. That's what happens in this circuit, it is a simple current regulator, that was used in a high-brightness LEDs, ...Continue reading..
Here is the solution for anyone working with graphics on LCD or CRT, converting images and photos in formats. C or. BIN. Called Image2Lcd , The program is ideal for anyone working with small LCD displays. It allows you to convert an image at a time, or also you can use the batch conversion ...Continue reading..
To connect the LEDs and prevent queimem, we have to limit the current, usually between 10 a 30mA (depending on the LED), and a resistance that is required in the circuit. However it has a drawback, the resistance value should be calculated for a fixed value of voltage. An example is a red LED (1,8Volts x 20mA) connected in 12Volts, resistance would be ...Continue reading..
Multimeters with LCD displays that use integrated circuits ICL7106 or similar AD converter, which typically use batteries 9 Volts, can not perform measurement of own source. The problem is that we must have a separate power supply for 9 volt sound elements for. The alternative is a converter 9 Volts effectively powered by a floating source. It ...Continue reading..
All though most of the current sources are bivolt, but imagine that old appliance, What is 220V, and you go to a location that the voltage is 110V. An example of a device that may have this problem is a shaver, which can be used 220V / 240In. This simple voltage doubler ...Continue reading..
Here is the solution for those who have fluorecentes lamps with burned reactors and want to enjoy and building a low-cost and high-performance inverter. This circuit works on the lamps fluorecentes 5 a 40 Watts, which may be a tubular or even economical circuits having their burn. The circuit bera the 100% efficiency, ...Continue reading..
O circuito Conversor DC/DC tem a função de converter uma tensão A para uma tensão B, geralmente maior, ai está dificuldade. Quando trabalhamos com tensão AC (AC), já existe uma oscilação, geralmente 60Hz, assim se aplicarmos esta tensão um transformador facilmente iremos diminuir ou aumentar esta tensão. Isto não ocorre na tensão DC (corrente contínua), como ela não oscila, ...Continue reading..
Quando nós acostumamos com fonte de alimentação acabamos por esquecer as pilhas e baterias, mas muitas vezes precisamos de uma pilha AA ou AAA e não temos, então o que fazer. Neste momento chega a hora de improvisar, e se virar para encontrar uma pilha ou fazer um adaptador de pilha, eu nem penso duas vezes e vou logo ligando ...Continue reading..