How to make a Negative 18V fixed voltage DC power supply | Power supply | Using LM7918


How to make a Negative 18V fixed voltage DC power supply | Power supply | Using LM7918

18v fixed 1A negative power supply regulator.

This is a simple negative power supply circuit diagram. In this circuit, an input negative voltage of -21V to -33V can be used, with a fixed output negative voltage of -17.3V to 18.7V. This power supply can drive negative -18V, 1amp, and 15-watt devices. It can be used as a 15 watt devices. This power supply uses a voltage regulator lm7918 IC. DC to DC voltage can be converted through this circuit. This is called a stop-down negative power supply.

Circuit Diagram

Negative 18V fixed Voltage ckt Diagram

Circuit Components

  1. LM7918 voltage regulator [See Buy Click Amazon]
  2. 1uf,50V Capacitor [See Buy Click Amazon]
  3. 0.1uf,50V Capacitor [See Buy Click Amazon]

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Components used:

  1. 1uf,50V Capacitor
  2. Capacitor,50V,1uf

    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.

  3. LM7918 Voltage Regulator
  4. LM7918

    The LM7918 voltage regulator fixed-voltage is an integrated circuit (IC). The Voltage Regulator provides constant output voltage even if its load or input voltage changes.LM7918 is a monolithic 3-terminal negative voltage regulator. It provides a fixed regulated output of -17.3Vt o -18.7V DC for a variable input voltage range of -21V to -33V DC. The maximum output current is 1.5 A. The dropout voltage of LM7918 is -2V. LM7918 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.

  5. 0.1uf,50V Capacitor
  6. 0.1uf 50v 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.

Frequently Asked Questions:
What is the maximum input voltage of LM7918?

LM7918 maximum input voltage is 33V.

What is the minimum input voltage of LM7918?

LM7918 maximum input voltage is 21V.

What is the maximum output current of LM7918?

LM7918 maximum output current up to 1amp

What is the number of LM7918 terminators?

The number of LM7918 terminals is three.

What is the peak output current of LM7918?

LM7918 peak output current up to 2.2amp,25"C.

Video: Circuit Test

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