Voltage regulator 7809
Absolutely! Following the same structure, here's the description for the 7809 voltage regulator:
🛠️ Voltage Regulator – 7809 (9V, 1A/1.5A)
Overview The 7809 is a three-terminal linear voltage regulator that outputs a stable +9V DC from a higher input voltage (typically 11–35V). It can provide up to 1A of current (some versions up to 1.5A with adequate heatsinking), with internal protections such as over-current limiting, thermal shutdown, and safe operating area protection. It's a very common choice for powering various electronic circuits and modules that require a precise 9V supply, often found in audio applications, microcontrollers, and general-purpose power supplies.
Key Features
Fixed output voltage: +9V DC
Maximum output current: 1A (some versions up to 1.5A with heatsink)
Input voltage range: ~11V to 35V (minimum 2V above output voltage for regulation, so at least 11V is recommended for stable operation)
Internal short-circuit and thermal overload protection
Low quiescent current (~4-8mA)
Standard TO-220 package; other variants may exist
Typical Wiring with Capacitors
Vin → 7809 IN
GND → 7809 GND
Vout → 7809 OUT (regulated 9V)
Place 0.33µF capacitor from IN to GND close to the regulator (for stability, especially if the regulator is far from the power supply filter).
Place 0.1µF capacitor from OUT to GND close to the regulator (to improve transient response and high-frequency noise filtering).
Heatsink recommended if outputting high current or using a high dropout voltage (large difference between Vin and Vout), as linear regulators dissipate excess power as heat.
Applications
Regulated 9V power for various electronic projects and modules (e.g., audio pre-amps, effect pedals, sensor power)
Small linear power supplies
Battery-powered devices requiring a regulated 9V supply
Current limiting for specific applications
Power distribution circuits
Educational electronics and prototype breadboard circuits
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