How to make positive negative Dual adjustable power supply project

How to make positive negative Dual adjustable power supply project

Positive negative 5-24v dual adjustable power supply.

A positive-negative power supply is used in electronic circuits that require both positive and negative voltages. For example, op-amps require both positive and negative DC voltage supplies to function properly. The negative voltage is one of lower potential than its reference point. It is not possible to have an absolute voltage that is not referred to as a reference point. A negative voltage is used in some applications such as wired telephone lines from the local exchange to the Customer Premises equipment and the use of Amps for AC amplification.

To design a 5V positive-negative dual power supply, You need to convert the 220V AC supply into 17V AC using a simple step-down transformer (220V/17V). The output of the transformer is given to the rectifier circuit, which will convert the AC supply into a DC supply. The output of the rectifier circuit that is DC contains the ripples in the output voltage. To filter out these ripples, two capacitors of 1000 uf, and 50V are used. The output of the capacitor that is pure DC is given to voltage regulators IC7805 and IC7905 which will regulate the output voltage at (5-24)V and -(5-24)V DC, despite the change in input voltage.

Circuit Diagram

Dual Adjustable power supply

Circuit Components

  1. LM7805 Voltage Regulator -01pc [See Buy Click Amazon]
  2. LM7905 Voltage Regulator -01pc [See Buy Click Amazon]
  3. 1N4007 diode-06pcs [See Buy Click Amazon]
  4. 10uf 50v Capacitor -02pcs [See Buy Click Amazon]
  5. 1uf 50v Capacitor -02pcs [See Buy Click Amazon]
  6. 22k ohm Resistor -02pcs [See Buy Click Amazon]
  7. *Please note: These are affiliate links. If you purchase items through these links, I may make a commission. I will appreciate your support in this way!

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    Components used:

    1. Voltage Regulator LM7805
    2. LM7805LM7805 Pinout diagram

      A Voltage Regulator is an integrated circuit (IC). Voltage regulator provides constant output voltage even if its load or input voltage changes.LM7805 is a monolithic 3-terminal positive voltage regulator. LM7805 has an input voltage of 7V to 20v and an output voltage of 4.8v to 5.2v constant. The maximum output current is 1A. It has internal thermal shutdown, short-circuit and SOA protection, and an output capacitance of 0.5 pF.

    3. LM7905 Voltage Regulator
    4. LM7905

      A Voltage Regulator is an integrated circuit (IC). Voltage regulator provides constant output voltage even if its load or input voltage changes.LM7905 is a monolithic 3-terminal negative voltage regulator. LM7905 has an input voltage of -7V to -20v and an output voltage of -4.8v to -5.2v constant. The maximum output current is 1.5-A. It has internal thermal shutdown, short-circuit and SOA protection, and an output capacitance of 0.5 pF.

    5. 1n4007 Diode
    6. Zener diode
      1N4007 diode

      Diodes are used to protect circuits by limiting the voltage and also transform AC into DC. Semiconductors like silicon and germanium are used to make the most of the diodes.

      1N4007 is a rectifier diode, designed specifically for circuits that need to convert alternating current to direct current. It can pass currents of up to 1A and have a peak inverse voltage (PIV) rating of 1,000 V.

    7. 1uf,50V Capacitor
    8. Capacitor,50V,1uf

      The capacitor is a Two-Terminal passive component having the Property of Capacitance. This Property Electrifies (charging with electricity) Capacitors with input Voltage. Capacitors Condense Electricity, Hence it is also known as a Condenser. It consists of two Electrical Conductors that are Separated by Distance. The Capacitor Stores Charge and can act like a Battery. It is necessary for filter Circuits to Minimize voltage spikes, and Smoothing changes in voltage.

    9. 10uf,50V Capacitor
    10. Capacitor 10uf 50v

      The capacitor is a Two-Terminal passive component having the Property of Capacitance. This Property Electrifies (charging with electricity) Capacitors with input Voltage. Capacitors Condense Electricity, Hence it is also known as a Condenser. It consists of two Electrical Conductors that are Separated by Distance. The Capacitor Stores Charge and can act like a Battery. It is necessary for filter Circuits to Minimize voltage spikes, and Smoothing changes in voltage.

    11. 22k ohm Resistor
    12. Resistor 22k

      A resistor is a component that resists the flow of electricity in a circuit. It is used to control the amount of current, voltage, or signal level in various applications. The unit of resistance is the ohm (Ω)Carbon Film Resistor. Value: 22k Ohm Wattage: 1/4W, Approximate Maximum Current: 21.13mA, Tolarence: ±5% Durable and easy to install small, low noise, precise and stable performance.Long service life.22k Ohm Resistor Color Code: Red-Red-Orange-Golden or Red-Red- Black-Red-Brown.

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    Frequently Asked Questions:
    Why use a positive-negative power supply?

    A positive-negative power supply is used in electronic circuits that require both positive and negative voltages. For example, op-amps require both positive and negative DC voltage supplies to function properly.

    Where is a negative voltage used?

    The negative voltage is one of lower potential than its reference point. It is not possible to have an absolute voltage that is not referred to as a reference point. A negative voltage is used in some applications such as wired telephone lines from the local exchange to the Customer Premises equipment and the use of Amps for AC amplification.

    What is the input voltage of positive-negative Dual adjustable power supply projects?

    Positive negative Dual adjustable power supply projects input voltage is +25v and -25V.

    What is a dual adjustable power supply?

    A dual adjustable power supply is an electronic device that provides a positive and negative voltage output. This is useful for powering circuits that require a dual (+/-) adjustable power supply. Shown is the circuit diagram of a dual adjustable power supply using IC's LM7805 and LM7905.

    Video: Circuit Test



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