C78 390k Ohm (390K) Carbon Film Resistor - 1/4 Watt (10PCS)

These are 390k Ohm fixed resistors, part of the standard E24 series. They are high-resistance components used primarily in applications where very low current flow is desired, such as in biasing circuits or timing networks.

Product Specifications

Color Code Breakdown

Reading from left to right:

1. 1st Band (Orange): 3

2. 2nd Band (White): 9

3. 3rd Band (Yellow): Multiplier (104 or 10,000)

4. 4th Band (Gold): Tolerance ($\pm 5\%$)

Calculation: $39\times 10,000=390,000\Omega$ or 390k$\Omega$

Key Features

• Stable Resistance: Reliable for long-term use in consumer electronics.

• Economic Choice: Carbon film offers a great balance of cost and performance for general-purpose hobbyist projects.

• Easy Identification: The clear orange-white-yellow bands make it easy to spot in an inventory kit.

Common Applications

• RC Timing Circuits: Used with capacitors to create specific time delays in oscillators (like the 555 timer).

• Transistor Biasing: Establishing the operating point for transistors in amplifier circuits.

• High-Impedance Inputs: Providing high resistance at the input of an operational amplifier to prevent loading the signal source.

• Voltage Dividers: Reducing high voltages to safe, measurable levels for microcontrollers.