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7809 Voltage Regulator
Sensors
Product ID:
HF105467
Stock:
84 units available
Details:
The 7809 is a linear voltage regulator IC.
It belongs to the 78xx series (positive fixed voltage ...
The 7809 is a linear voltage regulator IC.
It belongs to the 78xx series (positive fixed voltage regulators).
The number 09 means it outputs a fixed +9V DC.
So: 7809 = +9V Regulated Output
⚙️ Specifications
Input Voltage: 11V – 25V DC (needs at least 2V higher than output).
Output Voltage: Fixed at +9V DC.
Output Current: Up to 1A (with proper heat sink).
Dropout Voltage: Around 2V.
Power Dissipation: Limited by heat (use heatsink if input voltage is much higher).
📌 Pin Configuration (3 pins)
Pin 1 (Input) → Connect DC input (e.g., 12V, 15V, etc.).
Pin 2 (Ground) → Common ground.
Pin 3 (Output) → Provides regulated +9V DC.
🛠️ Working Principle
Suppose you have a 12V 2A adaptor.
Feeding this into a 7809 regulator will give you a stable 9V output, even if the adaptor voltage slightly fluctuates (like 11.5–12.5V).
The regulator dissipates excess voltage as heat.
⚙️ Typical Circuit
12V Adaptor (+) ───► [Pin 1: IN 7809]
GND ───────────────► [Pin 2: GND]
[Pin 3: OUT 7809] ─► +9V regulated output
Add 0.33µF capacitor near the input and 0.1µF capacitor near the output for noise filtering and stability.
If powering motors or heavy loads, also use electrolytic capacitors (e.g., 470µF at input, 100µF at output).
🔋 Applications
Powering circuits that require 9V DC, such as:
Small radios, amplifiers, and audio devices.
9V sensor modules.
Replacing 9V batteries in projects.
Microcontrollers and ICs that need regulated 9V.
Read more
PKR 44.00
