Variable Power Supply With Transistor

Wednesday, September 16th, 2015 - Power Supply Circuit

The circuit of variable power supply with transistor is an adapter with an adjustable output voltage from 0 volts to +15 volts DC. Voltage regulators used in the circuit variable power supply with transistors This is a zener diode configuration, voltage divider resistors and a current amplifier transistor. The circuit of variable power supply with transistors has the ability to provide a voltage source with a maximum current of 1 Ampere. Ability drain current of 1 A is influenced by the transistor Q1 is used, if it wants to raise the maximum current, eg 5 A transistor Q1 can be replaced with a larger type such as 2N3055 and replace the step down transformer which can provide a maximum current of 5A. The circuit of variable power supply with transistors is quite simple and can be made quickly, the components used to assemble a circuit of variable power supply with transistors are also easily available in the market. Schematic diagrams and components used to make a circuit of variable power supply with transistors can be seen in the following figure.

Schematic Circuit Of Variable Power Supply With Transistor

Variable Power Supply With Transistor

Components List Of Variable Power Supply With Transistor

  • R1 = 56ohm 2Watt
  • R2 = Potensiometer 330ohm
  • C1 = 2200uF 35V
  • C2 = 100uF 35V
  • C3 = 10uF 25V
  • C4 = 220uF 25V
  • C5 = 100nF 100V
  • D1 = Zener 18V 1.5W
  • GR1 = 4 X 1N4007
  • Q1 = D313
  • T1 = 220V 18V 1.5A

The circuit of variable power supply with the transistor in the image above can provide output voltages from 0 to +15 volts DC, where to set the output voltage level range of variable power supply with transistors can be done by adjusting the lever position potentiometer R2. For ease in setting the output voltage at the output of the circuit should variable power supply with transistors mounted a voltmeter to determine the output voltage at the time of setting the position of the potentiometer R2. Transistor Q1 in the circuit variable power supply with transistors will generate heat while working, therefore the transistor Q1 need to install a cooling (heat sink) to remove the heat generated in the transistor Q1 in the circuit variable power supply with transistor.

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