Variable Power Supply 4A

Tuesday, November 20th, 2018 - Power Supply Circuit

The circuit of variable power supply 4A is built using a voltage regulator of operational amplifiers and transistors. Circuit output voltage variable power supply 4A can be set from 1.5 volts to 25 volts. The maximum current carrying capacity can be given by the variable power supply is 4 Ampere. To control or regulate the output voltage of the circuit variable power supply 4A is can done by adjusting the lever position potentiometer 4.7 Kohm. The circuit of variable power supply 4A can be used to provide voltage supply to electronic devices with input voltages from 1.5 volts to 25 volts. To create a circuit of variable power supply 4A can be seen schematics and components used in the image circuit variable power supply 4A below.

The Circuit Of Variable Power Supply 4A

Variable Power Supply 4A

The circuit of variable power supply 4A shown above is built using a voltage regulator of the Op-Amp IC uA741 to control the output voltage is determined from the position of the lever potentiometer 4.7 Kohm. As a current amplifier in the circuit variable power supply 4A is used type power transistors 2N3055 and BD137 are arranged in Darlington. If you want to increase the ability of current drain on the power supply can be done by replacing the 2N3055 transistor with a bigger tip.

Component Of Variable Power Supply 4A

The circuit of variable power supply 4A in the image above consists of the following sections.

  • Step-down voltage, the part that serves to lower the AC mains voltage 220V AC voltage to 25 volts. A component that serves as a step-down voltage transformer without CT is the output voltage of 25 volts AC.
  • Rectifier, namely the part that serves to change or rectify the AC voltage into DC voltage. The components used are diode bridge and capacitors 10000 uF / 40V.
  • Voltage regulators, this section serve to determine the output voltage of the power supply as needed and as the output voltage stabilizer. It was built with the configuration of a voltage regulator with Op-Amp IC uA741 and several supporting components.
  • Power regulator is the part that serves to strengthen the ability of current drain on the power supply, power regulator section is built with transistors strung Darlington transistors BD137 and 2N3055.

2N3055 transistor in the circuit variable power supply 4A above must be equipped with cooling (heat sink), which serves to remove the heat generated at the time variable power supply 4A work.

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