Скачать или смотреть How to Build a Symmetrical ±9V Power Supply Using 7809 & 7909 Regulators in Proteus

This video demonstrates a symmetrical dual-polarity power supply using 7809 (positive) and 7909 (negative) voltage regulators in Proteus Software. The circuit generates ±9V outputs from a single AC input, ideal for applications like op-amp circuits, differential amplifiers, and analog signal processing.

Key Features:

Transformer & Bridge Rectifier: Steps down 220V AC to a lower AC voltage and converts it to pulsating DC.
7809 Regulator: Stabilizes the positive output to +9V.
7909 Regulator: Stabilizes the negative output to -9V.
Filter Capacitors (2200µF): Reduce ripple voltage for smooth DC output.
Output Meters: Real-time visualization of both ±9V outputs in Proteus.
How It Works:

AC-to-DC Conversion:
The transformer steps down 220V AC to a lower AC voltage.
The bridge rectifier converts AC to pulsating DC.
Voltage Stabilization:
The 7809 regulator stabilizes the positive voltage to +9V.
The 7909 regulator stabilizes the negative voltage to -9V.
Ripple Filtering:
Large capacitors (2200µF) smooth the pulsating DC.
Smaller capacitors (10µF, 10nF) eliminate residual noise.
What you’ll learn:

How to create symmetric ±V outputs from a single AC source.
Role of capacitors in filtering and stabilizing voltage.
Importance of dual-polarity power supplies in analog circuits.
Simulating real-world circuits in Proteus.
⚠️ Safety Note: Always use isolation transformers and follow safety protocols when working with high-voltage loads.

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