Technical Notes and Articles

Online tool to assist you in determining the optimal value of the series dropping resistor to limit the current through your LED circuit. Just input the indicated values and press the “Calculate” button.

The Creality Ender 3 is a remarkable low-cost 3D printer. An excellent first-time 3D printer and also an attractive option for an additional printer to your collection. See our handy hints so you too can get the most from your Ender 3.

Do-It-Yourself circular 24-LED board for 3mm or 5mm LEDs. Great for use creating custom lighting solutions and Infrared illuminators.

DIY system for an Infrared Illuminator with 850nm or 940nm IR LEDs. Ideal for use with Nest Cameras or any cameras with IR Illumination.

Design overview of a do-it-yourself design to build a UV exposure system using UV LEDs. This UV LED system can expose your boards in 30 seconds or less. This UV Light Source is capable of exposing photo-resist or for the UV curing of different paints and finishes.

Color Cycling LEDs are a very different type of LED. Each features three separate LEDs connected to a dedicated microcontroller inside of the LED. When powered, the LED will automatically perform a slow fade cycle.

Candle Flicker LEDs are a new generation of LEDs which incorporate a tiny microprocessor which, when power is applied, will closely mimic a real candle flame.

We have detailed step-by-step instructions on setting up and configuring Arduino IDE to use and program the NodeMCU ESP8266. Complete with example code and links to example sketches.

NodeMCU EPS8266 information, model comparisons and differences, technical specifications, device pinouts, and use with Arduino IDE.

Compact digital panel meter measures currents from 0-49.9A and voltages from 0-99.9V DC through dual 0.28″ LED displays. Complete with an external 50A shunt.

Highly efficient DC step down power converter board features a 5V-15V input voltage and delivers up the 3A output at 1.25V, 1.5V, 1.8V, 2.5V, 3.3V or 5V output in a tiny easy to use package.

Crimping and RJ45 Connector Correctly. How to properly wire and crimp an RJ45 connector for Cat5/5e Ethernet cable.

A resistor is one of the most common building block used in electronics circuits. Resistors are available in several shapes and sizes. This tool decodes information for all color banded resistors.

Driver for 1 watt or 3 watt High Power LEDs. LED drivers can be a confusing part of LED technology. Our exclusive Driver Board holds three LED Drivers and deliver PWM power to up to 12 high power LEDs

Hikvision NVRs lack remote viewing capabilities with Google Chrome. This walkthru provides details on how to restore viewing capabilities.