Arduino LED Resistor

The Arduino [1] Input/Output (I/O) pins can be used to control an LED and make it blink. It does this, by turning the output pin on and off. Arduino Resistor …

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Why is a Resistor Required for an LED?

A current limiting resistor is used in series with a Light Emitting Diode (LED). In this post we will explain why we need this resistor. LED Current and Voltage Specifications …

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How to Improve Return Loss or VSWR

In this post we show a simple technique to improve the return loss of an RF component like a mixer or amplifier. A good VSWR to aim for is at …

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TRP vs EIRP

Total radiated power (TRP) is the total power radiated by an antenna. It is a function of the output power from the transmitter and the antenna efficiency. As the antenna …

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What is the Arduino ADC Sampling Rate?

In this post we clarify the sampling rate numbers of the Arduino’s Analog-to-Digital converter. What is Sampling Rate? The sampling rate of an Analog-to-digital converter is the speed at which …

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Arduino Voltage Divider Calculator

In this post we calculate the resistor values for a voltage divider network used with an Arduino. Background A voltage divider reduces the input voltage to a smaller value. In …

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LMR-600 vs LMR-400 RF Cable

LMR cables are manufactured by Times Microwave [1]. In this post we explore the differences between the two. Cable Loss Using the Cable Loss Calculators for LMR 400 and LMR …

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Roku RSSI vs SNR – What do they mean?

When you go to your Roku Wireless Secret Screen, you will see a number of parameters on display. The picture below shows that the Roku system is connected to channel …

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MT7921 vs AX210

Both MediaTek MT7921 and Intel AX210 are Wi-Fi and Bluetooth combination cards. In this post we compare the main differences between the two products and look at some real world …

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