13.8V 20A Power Supply

Tuesday, February 6th, 2018 - Power Supply Circuit

The circuit of 13.8V 20A power supply made for the purposes of an FM transmitter circuit that requires a large current consumption with voltage +13.8 volts. The circuit of 13.8V 20A power supply in the figure below is able to provide a stable output level +13.8 volt DC output voltage and a steady current 20 Ampere. To make the circuit of 13.8V 20A power supply can see the schematic diagram and parts list below.

The circuit of 13.8V 20A Power Supply

13.8V 20A Power Supply

The circuit of 13.8V 20A power supply above made to produce a stable output with a large current. Power supply 13.8 volts in the image above consists of two main parts, namely the +13.8 volt voltage regulator and current amplifier section that can be adjusted up to 20 Amperes. Current amplifier for power supply circuits using FET BUZ11 and transistor 2N5683.

Component of 13.8V 20A Power Supply

13.8 Volt Voltage Regulator

13.8 volt voltage regulator circuit, made using a positive voltage regulator IC LM7812 plus the voltage divider R5 and R6 so that the output voltage becomes 13.8 volts. In this section as a current amplifier for voltage regulators use PNP transistors Q3 tip 2N5683.

Current Regulator 20 Ampere

The current regulator circuit for the power supply is built using transistor Q4 BC547 type as a current amplifier FET driver BUZ11 type. Current carrying capacity of circuit 20A power supply 13.8V’ can be set from 1A to 20 A using potentiometer P1.

The circuit of 13.8V 20A power supply comes with several indicators that serves to monitor the condition of each part in this power supply.

  • LED 1, is used to monitor the status of the voltage regulator circuit power supply is 13.8V
  • LED 2, serves to monitor the output voltage of power supply circuit as a whole
  • LED 3 is used to monitor the current regulator circuit power supply is 13.8 volts

2N5683 transistor Q3 and FET1 BUZ11 type must be equipped with cooling (heat sink) to absorb the heat that arises when the circuit of 13.8V 20A power supply of this

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