LL34 is a general purpose power switching SMD Zener Diode. SMD diodes LL34  have a range of anode/cathodeidentifiers. Sometimes it’s easiest to just use a multimeter to test for polarity. Turn the multimeter to the diode setting (usually indicated by a diodesymbol), and touch each probe to one of the LEDterminals. … Diodes certainly aren’t the only polarized component.

Replacement of Heating Element for SMD Rework Station.

High heating rate so fast heating up, good insulating property, high efficiency and long life.

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

These resistors are typical axial-lead metal film resistors, which have much better temperature stability than their carbon equivalents which provides lower noise and are generally better for high frequency or radio frequency applications.

2n2222 is a bipolar junction transistor with NPN polarity designed to use in general purpose amplification and switching application. The transistor can handle collector current up to 800mA. Its key features are low power, low to medium current, medium voltage, and moderate speed.

The IR Receiver is a type of Diode but different from the LED. It does not emit any light but detects the presence of light. This diode allows some current to pass through it after detecting light and amount of current flow is directly proportional to the amount of light detected and makes a pair with IR transmitter.

Heat Shrink Sleeve 4mm  are excellent for insulation. They have exceptional insulation characteristics, excellent stress control properties; long-term weather and regular wear and tear resistance, ease of installation and reliable performance in even in harshest of the situations.

These High performance 2:1 heat shrink material tubes, bundles, and protects cables; wire and hoses are used for a wide range of DIY applications. It is used extensively for cable and wire harnessing, strain relief, insulation, color-coding, identification, and protection.

These 5mm units have four pins - Cathode is the longest pin. One for each color and a common cathode. Use this one LED for three status indicators or pulse width modulate all three and get mixed colors!

You can make unlimited colours with this just one LED.These LEDs are diffused; so they’ll appear dimmer, but have a wider viewing angle.

0402 capacitor is Mounted either by flow or reflow soldering methods and gives excellent dielectric strength due to uniform structure of dielectric layers 

12V & 7A Relay Module For Raspberry Pi, Arduino, DSP, AVR, PIC, 8051 and other microcontrollers.

This Relay is used for wide variety of AC & DC applications like Home Automation configured, Solenoids, Motors, lights, fans, heavy load device, home appliances & controlling higher current loads from microcontroller development board.

0402 capacitor is Mounted either by flow or reflow soldering methods and gives excellent dielectric strength due to uniform structure of dielectric layers 

This TP4056 1A Li-ion lithium Battery Charging Module with Circuit Protection – Micro USB is a tiny module, perfect for charging single cells that don’t have their own protection circuit. Based on the TP4056 charger IC and DW01 battery protection IC this module will offer 5V 1A charge current then cut off when finished.

Furthermore when the battery voltage drops below 2.4V the protection IC will switch the load off to protect the cell from running at too low of a voltage – and also protects against over-voltage and reverse polarity connection (it will usually destroy itself instead of the battery) however please check you have it connected correctly the first time.

LL34 is a general purpose power switching SMD Zener Diode. SMD diodes LL34  have a range of anode/cathodeidentifiers. Sometimes it’s easiest to just use a multimeter to test for polarity. Turn the multimeter to the diode setting (usually indicated by a diodesymbol), and touch each probe to one of the LEDterminals. … Diodes certainly aren’t the only polarized component.