Wi-Fi Receiver Sensitivity
The sensitivity of a radio is the minimum signal level at the input port required to demodulate and decode a signal. Wi-Fi Receiver Sensitivity is specified in dBm and varies …
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What is a Bias Tee?
A bias tee or Bias-T is a three port network consisting of an inductor and capacitor as shown in the picture below. The three ports are: Applications in Signal Reception …
dBm to Internet Speed
In this post we show how Internet Speed (Mbps) varies with the received signal strength or RSSI (dBm), using measurements. Wi-Fi Network Planning When planning your Wi-Fi network, use this …
Do Resistors in Parallel have the Same Current?
Parallel resistors do not have the same current flowing through them. The current through each resistor depends on Example Current Calculation For a three resistor network (R1 = 10 Ω, …
Longest Range TV Antenna (Do the marketing claims make sense?)
The range of TV antennas seems to increase with every passing year. The last time I checked it was 200 miles. This year in 2023 we now have 300 mile …
What is the ADC Sampling Rate of the Raspberry Pi?
In this post we clarify the sampling rate numbers of the Raspberry Pi Pico’s Analog-to-Digital Converter (ADC). The data sheet for the RP2040 is used for reference. Here is a …
5V to 3.3V Voltage Divider
In many circuit applications there is a requirement to drop 5 Volt down to 3.3 Volt. For example, a microcontroller may not be able to tolerate input voltages greater than …
Razer Hyperspeed vs Bluetooth
Razer mouse can use either Bluetooth or 2.4 GHz wireless to connect. A switch under the mouse allows the user to select either mode. To enable the fast Hyperspeed mode, …
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 …
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 …