Simple Hum Free Regulator Power Supply Circuit

This design uses a common transistor known as a 2N3055 to create a clean stable power source.

It prevents any unwanted noise hum that sometimes occurs from power supply.

What is a Hum Free Regulator Power Supply:

A Hum Free Regulator Power Supply circuit is an electronic circuit made to reduce or completely remove the distracting electrical hum or noise that often has links to power supply while also giving electronic devices a steady and controlled output voltage.

Usually this kind of circuit uses filtering methods and voltage control components to provide a clean steady power output and by reducing disturbance in sensitive electrical and audio applications.

Circuit Working:

Parts List:

The 25V 5A transformer provides an AC voltage output.

A 6A4 diode is used to adjust the AC voltage generating a pulsing DC voltage.

The 220uF filter capacitor smoothens the pulsating DC producing a relatively stable DC voltage of around 30V.

The 30V DC voltage from the filter capacitor is applied to the collector of the 2N3055 transistor.

The base of the 2N3055 transistor is connected to the 30V line through a 1k resistor.

This resistor provides bias to the transistor.

A 10uF capacitor is connected between the base of the 2N3055 transistor and the ground line of the circuit.

This capacitor is responsible for creating a pure and constant DC voltage at the base of the 2N3055 transistor.

The emitter of the 2N3055 transistor is the output of the regulator and it produces a regulated and hum-free DC voltage.

Circuit Operation Explanation:

The 2N3055 transistor can control the output voltage because of the biasing provided by the 1k resistor.

The 10uF capacitor that is connected between the base and ground acts as a low pass filter removing any AC ripple or high frequency noise from the 30V line.

This capacitor ensures a steady and hum free output by producing a steady DC voltage at the 2N3055 transistors base.

When used as an emitter follower the 2N3055 transistor produces a low impedance output that closely tracks the voltage at its base.

This keeps the output voltage steady.

Audio amplifier circuits are powered by the regulated and hum free DC output from the 2N3055 transistors emitter which ensures that the audio output is clear and free of humming noise.

Advantages of the Circuit:

• The output of the 2N3055 transistor is clear and hum free because of to the 10uF capacitor at its base which filters out AC ripple and noise.
• To maintain stability the output voltage is controlled by the 2N3055 transistor which functions as an emitter follower.
• A hum free power source is essential for high quality audio output in audio amplifier circuits and the simple hum free regulator power supply circuit is made to deliver a steady and clean power source.

Safety:

• Remember to follow proper safety precautions and use the correct ratings for components based on the specific requirements.

Formulas:

One must make sure that voltage regulation filtering and thermal management are done correctly while designing a circuit for a hum free regulator power supply.

Below mentioned are the general formulas for the same:

Base Resistor:

To adjust the 2N3055s base current follow the following calculation:

R = V_diode​−V_BE​​ / I_B​

where,

• The diode voltage 15V for a 15V output is represented as Vdiode.
• The 2N3055s base emitter voltage roughly 2V is represented as VBE.
• The intended base current IB is usually around one tenth of the output current.

How is the Circuit Build:

To build a simple hum free regulator power supply circuit follow the below mentioned connection steps:

Input Stage:

• The breadboard should be connected to the 25V 5A transformer.
• To correct the AC voltage connect the transformers secondary side to the 6A4 rectifier diode.
• The diodes output should be connected to the breadboards positive supply.
• The diodes negative side should be connected to the breadboards negative supply.
• Connect the positive supply to the 220uF capacitors positive leg.
• The capacitors negative leg should be connected to the negative supply.

Regulator Stage:

• Connect the positive terminal of the 220uF capacitor to the collector pin of the 2N3055 transistor.
• The ground supply has to be connected to the emitter pin of the transistor 2N3055.
• The base of the 2N3055 transistor should be connected to the positive supply through a 1k resistor.
• It is necessary to connect a 10uF capacitor between the base of the 2N3055 transistor and the ground supply.
• Make sure all the connections are correct and safe by checking them a second time

Testing:

• Turn on the circuit and use a multimeter to measure the output voltage across the ground supply and the emitter of the 2N3055 transistor.
• Check the output voltages stability and if needed make necessary adjustments to the input voltage.
• If you want a constant and steady DC voltage at the 2N3055 transistors base than measure the voltage across the 10uF capacitor.

Important Considerations:

• Be sure the transistor pin configurations are right by checking them again.
• Keep an eye on the diode and capacitor polarity.
• Check for any short circuits and make be sure with soldered connections are safe.
• While testing the circuit begin with a lower input voltage to prevent harm.

Conclusion:

Keep in mind that this is only a basic overview and that actual assembly may differ depending on the datasheets or changes of individual components.

Ask knowledgeable people for advice or refer to appropriate tools if you have any questions regarding any component of the circuit or its construction.

Safety should always come first and electronic components should be handled carefully.

References:

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