12V To 24V DC-DC Converter Circuit Diagram

This is a simple project of 12V To 24V DC-DC Converter Circuit Diagram.This simple 12V To 24V DC-DC Converter Circuit Diagram can provide up to 24V from a 12V source. It can be used to run radios, small lights, relays, horns and other 24V accessories from a 12V vehicle with a maximum draw of about 800mA. 

It can be used to charge one 12V battery from another, or step up the voltage just enough to provide necessary overhead for a 12V linear regulator. Using one op-amp as a square wave oscillator to ring an inductor and another op-amp in a feedback loop, it won't drift around under varying loads, providing a stable 24V source for many applications. With a wide adjustment in output this circuit has many uses.

 12V To 24V DC-DC Converter Circuit Diagram


12V To 24V DC-DC Converter Circuit Diagram

Parts



Part

Total Qty.

Description

Substitutions
R1, R2, R3, R4, R8, R76100K 1/4W Resistor
R51470 Ohm 1/2W Resistor
R6110K Linear Pot
C110.01uF Mylar Capacitor
C210.1uF Ceramic Disc Capacitor
C31470uF 63V Electrolytic Capacitor
D111N4004 Rectifier Diode
D21BY229-400 Fast Recovery DiodeSee Notes
Q11BC337 NPN Power Transistor
U11LM358 Dual Op Amp IC
L11See Notes
MISC1Board, Wire, Socket For U1, Case, Knob For R6, Heatsink for Q1

Notes
  • R6 sets the output voltage. This can be calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A).
  • L1 is made by winding 60 turns of 0.63MM magnet wire on a toroidial core measuring 15MM (OD) by 8MM (ID) by 6MM (H).
  • D2 can be any fast recovery diode rated at greater then 100V at 5A. It is very important that the diode be fast recovery and not a standard rectifier.
  • Q1 will need a heatsink.


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