How to make a stable 9V, 12 amp power supply using BD712 transistor | LM7809


How to make a stable 9V, 12 amp power supply using BD712 transistor | LM7809

High output current fixed 9V Regulator.

It is a 9V Voltage Regulator power supply. This is the circuit diagram. In this circuit, an input positive voltage of 12V is used with an output positive voltage of 9V. This power supply can drive positive 9v, 12amp(max), and 75-watt(max) devices. It can be used as a 75-watt (max) device. This power supply uses a voltage regulator LM7809 and BD712 PNP Transistor. DC to DC voltage can be converted through this circuit. This is called a stop-down positive power supply.

Circuit Diagram

9v 12amp ckt diagram

Circuit Components

  1. LM7809 voltage regulator [See Buy Click Amazon]
  2. BD712 Transistor [See Buy Click Amazon]
  3. 3.3-ohm Resistor [See Buy Click Amazon]
  4. 1uf,50V Capacitor [See Buy Click Amazon]
  5. 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. LM7809 Voltage Regulator
  4. LM7809

    The LM7809 voltage regulator fixed-voltage is an integrated circuit (IC). The voltage regulator provides constant output voltage even if its load or input voltage changes.LM7809 is a monolithic 3-terminal positive voltage regulator. It provides a fixed regulated output of 8.65V- 9.35V DC for a variable input voltage range of 11.5V to 24V DC. The maximum output current is 1 A. The dropout voltage of LM7809 is 2V. LM7809 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. BD712 Transistor
  6. PNP Transistor

    PNP Transistors are made of silicon or germanium semiconductor materials. When an n-type semiconductor element is made up of two p-type semiconductor elements, it is called a PNP transistor. Shows a layer of n-type material sandwiched between two layers of p-type material. It is called a PNP transistor. PNP transistor has three terminals: emitter, base, and collector.

    BD712 Transistor

    The BD712 is a PNP Transistor. The collector and emitter pins are closed (forward-biased) when the base pin is grounded. When a positive voltage is applied to the base pin, the collector and emitter pins are open (reverse biased). It is a bi-polar NPN transistor. This component has a maximum collector current (IC) of 12A, an emitter-base voltage (VBE) of 100V, a base current (IB) of a maximum of 5A, a maximum of 75 watts, and a Collector peak current of 18amp.

  7. 3.3-ohm Resistor
  8. 3.3 ohm Resistor

    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 ohm (Ω). Carbon Film Resistor.Value: 3.3 Ohm Wattage: 2W, Approximate Maximum Current: 1.16A, Tolarence: ±5% Durable and easy to install Small, low noise, precise and stable performance.Long service life.3.3 Ohm Resistor Color Code: Orange, Orange, Golden, Golden.

  9. 0.1uf,50V Capacitor
  10. 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 minimum and maximum input voltage of LM7809?

LM7809 minimum and maximum input voltage is 11.5V to 24V.

What is the minimum and maximum output voltage of LM7809?

LM7809 minimum and maximum output voltage is 8.65V to 9.35V and fixed 9v.

What is the maximum Collector Base voltage of the BD712 Transistor?

BD712 Transistor maximum Collector Base voltage is 100V.

What is the maximum Collector-Emitter voltage of the BD712 Transistor?

BD712 Transistor maximum collector Emitter voltage is 100V.

What is the maximum Collector Current of the BD712 Transistor?

BD712 Transistor maximum collector Current is 12amp.

What is the maximum collector peak Current of the BD712 Transistor?

BD712 Transistor maximum collector peak Current is 18amp.

What is the maximum Base Current of the BD712 Transistor?

BD712 Transistor maximum Base Current is 5amp.

What is the maximum Emitter Base voltage of the BD712 Transistor?

BD712 Transistor maximum Emitter Base voltage is 5V.

What is the maximum power of the BD712 Transistor?

BD712 Transistor maximum power is 75watt.

What is the maximum storage temperature of the BD712 Transistor?

BD712 Transistor maximum storage temperature is -65 to 150 degrees Celsius.

Video: Circuit Test

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