Variable Power Supply

 To achieve multiple output voltages from a single 10V transformer, you can use a combination of voltage doubler circuits, regulators, and DC-DC converters. Here's a practical approach:

Variable Power Supply Circuit 

0 to 30 V , 0 to 10 amp

Components Needed:

1. Voltage Doubler Circuit:

   • Capacitors: Typically, 100µF to 1000µF, 25V.
   • Diodes: 1N4007 or similar rectifier diodes (2 pieces).

   Purpose: Converts 10V AC to approximately 20V DC (after rectification).

2. DC-DC Buck Converters:

   • For stepping down voltages: Use adjustable or fixed DC-DC buck converters.
   • Common Models: LM2596 (adjustable) or LM2576 for fixed outputs.

3. Linear Regulators:

   • For specific outputs: 7805 for 5V, 7812 for 12V, etc.
   • Capacitors: Typically 0.33µF and 0.1µF for stability.

4. Voltage Regulator ICs:

• LM317 (Adjustable): Can be used for various output voltages (needs external resistors for setting).
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5. Variable Power Supply Homemade

Circuit Design:

1. Voltage Doubling:

• Components:
  • 2 × 1N4007 diodes.
  • 2 × 100µF capacitors.
• Circuit: Connect the AC output from the transformer to the diode-capacitor network to get approximately double the input voltage as DC.

Powerful Volt & Current adjustable 

1. Voltage Regulation:

   • 12V Output: Use a LM7812 regulator.
   • 24V Output: Use the doubled DC (from the voltage doubler) and an LM7824 regulator.
   • 9V Output: Use a LM7809 regulator.
   • 6V Output: Use an adjustable regulator like LM317 or LM7806.
   • 5V Output: Use a LM7805 regulator.
   • 7.5V Output: Use an adjustable regulator like LM317.
   • 3V Output: Use a DC-DC buck converter.
   • 1.5V Output: Use a DC-DC buck converter.

Example Connections:

• Voltage Doubler:

  • Connect the secondary winding of the transformer to the input of a diode-capacitor network. This will give you approximately 20V DC.

• Regulated Outputs:

• 12V: Connect the 20V DC to the input of an LM7812 regulator. Output will be 12V.
• 5V: Connect to LM7805 regulator.
• 9V: Connect to LM7809 regulator.
• 3V and 1.5V: Use adjustable DC-DC buck converters to step down the voltage accordingly.

12 Volt Variable DC Supply 

Useful Links for Better Understanding:

1. Voltage Doubler Circuit:

   • Voltage Doubler Basics

2. Linear Regulators:

   • LM78xx Series Voltage Regulators

3. DC-DC Converters:

   • Buck Converter Basics

4. LM317 Adjustable Regulator:

• LM317 Datasheet

Mini Variable Power Supply 0 to 30 volts

These resources will help you understand the components and how to assemble circuits for various voltage outputs from a single transformer.

      

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