How to make 15v positive negative dual power supply project

How to make 15v positive negative dual power supply project

15v positive negative dual power supply using LM7815 and LM7915

A Voltage Regulator is an integrated circuit (IC). The voltage regulator provides constant output voltage even if its load or input voltage changes. Depending on the electrical design,It is used to control one or more AC or DC voltages. A Voltage Regulator Allows the Alternator to Make Enough Power to Run the Devices on a Vehicle. However, it only Uses The Power Necessary for the Devices. When a Regulator Fails, The Limits On How Much Power An Alternator Can Produce Disappear. A heat Sink Should be Attached to a Voltage Regulator to dissipate Excess Power that may Enter into The Regulator. This prevents excess Voltage From Destroying and Overheating the Voltage Regulator Since the Heat Sink Dissipates the Excess Power as heat.

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. A negative voltage is one of a 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 15V positive-negative dual power supply, You need to convert the 220V AC supply into 15V AC using a simple step-down transformer (220V/15V). 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 Capacitor of 1000 uf, and 50V are used. The output of the capacitor that is pure DC is given to voltage regulators IC 7815 and IC7915 which will regulate the output voltage at 15V and -15V DC, despite the change in input voltage.

Circuit Diagram

15v Dual power supply

Circuit Components

  1. Stepdown Transformer-01pc [See Buy Click Amazon]
  2. Voltage Regulator LM7815 -01pc [See Buy Click Amazon]
  3. Voltage Regulator LM7915 -01pc [See Buy Click Amazon]
  4. 1N4007 diode-06pcs [See Buy Click Amazon]
  5. Capacitor 1000uf,50v -04pcs [See Buy Click Amazon]
  6. Capacitor 10uf 50v-02pcs [See Buy Click Amazon]
  7. Resistor 22k ohm-02pcs [See Buy Click Amazon]

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Components used to Step down voltage converter:

  1. Step Down Transformer
  2. 12v Transformer

    Using a Transformer, electric energy can be moved from one AC circuit to another. A transformer uses the electromagnetic induction principle to either increase or decrease the AC voltage (step-up or step-down). To lower the power in the circuits of low-voltage devices like doorbells, transformers are frequently utilized.

  3. Voltage Regulator LM7815
  4. Voltage Regulator LM7815

    The LM7815 Voltage Regulator fixed-voltage is an integrated circuit (IC). The voltage regulator provides constant output voltage even if its load or input voltage changes.LM7815 is a monolithic 3-terminal positive voltage regulator. It provides a fixed regulated output of 14.4V- 15.60V DC for a variable input voltage range of 17.5V to 30V DC. The maximum output current is 1 A. The dropout voltage of LM7815 is 2V. LM7815 IC is in compact packaging with 3 pins for positive input voltage/positive output voltage and ground pin. It has internal thermal shutdown, short-circuit and SOA protection, and an output capacitance of 0.5 pF.

  5. Voltage Regulator LM7915
  6. LM7915

    The LM7915 Voltage Regulator fixed-voltage is an integrated circuit (IC). The voltage regulator provides constant output voltage even if its load or input voltage changes.LM7915 is a monolithic 3-terminal negative voltage regulator. It provides a fixed regulated output of -14.4V to -15.60V DC for a variable input voltage range of 17.5V to 30V DC. The maximum output current is 1 .5A. The dropout voltage of LM7915 is 2V. LM7915 IC is in compact packaging with 3 pins for negative input voltage/negative output voltage and ground pin. It has internal thermal shutdown, short-circuit and SOA protection, and an output capacitance of 0.5 pF.

  7. Diode 1n4007
  8. Zener diode
    1N4007 diode

    Diodes PN junctions and semiconductor devices.Converts AC to DC,This is a rectifier device.1N4007 is a rectifier diode.It can pass currents of up to 1A and have a peak inverse voltage (PIV) rating of 1,000 V. Half-wave, full-wave, and bridge rectifiers can be made with 1n4007 diodes. This diode is most commonly used.

  9. Capacitor,50V,1000uf
  10. Capacitor

    The Capacitor is a Two-Terminal detached part having the Property of Capacitance This Property Zaps (accusing of power) Capacitors with input Voltage. Capacitors Gather Power, Thus it is otherwise called a Condenser. It comprises two Electrical Conveyors that are Isolated by Distance. The Capacitor Stores Charge and can carry on like a Battery. It is fundamental for channel Circuits to Limit voltage spikes, and Smoothing changes in voltage

  11. Capacitor,10uf,50V
  12. Capacitor 10uf 50v

    The Capacitor is a Two-Terminal detached part having the Property of Capacitance This Property Zaps (accusing of power) Capacitors with input Voltage. Capacitors Gather Power, Thus it is otherwise called a Condenser. It comprises two Electrical Conveyors that are Isolated by Distance. The Capacitor Stores Charge and can carry on like a Battery. It is fundamental for channel Circuits to Limit voltage spikes, and Smoothing changes in voltage

  13. Resistor 22k ohm
  14. 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.

What is the maximum input voltage of LM7815

LM7815 maximum input voltage is 30V.

What is the maximum input voltage of LM7915?

LM7915 maximum input voltage is -30V.

Video: Circuit Test



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