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Voltage regulator 7912

You're shifting to the negative voltage regulators now! The "79" series (like 7912) is the counterpart to the "78" series, providing negative regulated voltages. This is crucial for circuits that require both positive and negative power supplies (dual supplies), often found in audio amplifiers (like for Op-Amps) and other analog circuits.


Here's the description for the 7912 voltage regulator:

🛠️ Voltage Regulator – 7912 (-12V, 1A/1.5A)


Overview The 7912 is a three-terminal linear negative voltage regulator that outputs a stable -12V DC from a more negative input voltage (typically -14.5V to -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 is a fundamental component for applications requiring a precise -12V supply, especially in dual power supply configurations alongside positive regulators (like the 7812).



Key Features

  • Fixed output voltage: -12V DC


  • Maximum output current: 1A (some versions up to 1.5A with heatsink)

  • Input voltage range: ~-14.5V to -35V (input must be at least 2.5V more negative than the output voltage for proper regulation)

  • Internal short-circuit and thermal overload protection

  • Low quiescent current (~3-5mA)

  • Standard TO-220 package; other variants may exist


Typical Wiring with Capacitors The pinout for the 79xx series is different from the 78xx series. Always refer to the datasheet for the exact pinout of your specific component, but typically:

  • IN → 7912 Input (Unregulated Negative Voltage, e.g., -15V)

  • GND → 7912 Ground (Common Ground)


  • OUT → 7912 Output (Regulated -12V)

  • Place 0.33µF to 2.2µF 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 to 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 input and output voltage), as linear regulators dissipate excess power as heat.


Applications

  • Dual Power Supplies: Commonly used with 7812 to create a symmetrical +/-12V power supply for Op-Amps and other analog circuits.


  • Regulated negative 12V power for various electronic projects and modules.


  • Current limiting for specific negative voltage applications.

  • Power distribution circuits where negative rails are required.

  • Educational electronics and prototype breadboard circuits involving bipolar power.

✅ Resources

10.00 LE 10.00 LE

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Regulators