12V To 24V DC-DC Converter Circuit

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This simple DC-DC converter 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 squarewave 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.


Schematic for the 12 To 24V DC-DC Converter circuit


Total Qty.
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


  1. R6 sets the output voltage. This can be calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A).
  2. 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).
  3. 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.
  4. Q1 will need a heatsink.

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12V To 24V DC-DC Converter
Monday, March 23, 2015 1:20:29 AM
how to convert this same circuit instead of 24V 75V any idea
12V To 24V DC-DC Converter
Tuesday, March 11, 2014 11:25:23 PM
If I could replace the caps and resistors with higher watt rated caps and resistors and the IC with something a little more robust ... could this circuit be made to produce 4 amps? I need to run a laptop from my cars lighter socket. Any ideas about what IC could be used for that? Thanks.
12V To 24V DC-DC Converter
Monday, September 16, 2013 8:32:54 AM
For a detailed video about this type of 12V inverter in action. See this link: https://www.youtube.com/watch?v=tyvZGIlHEok I have put together many of Aaroncake's circuits, many very good, but I did have issues with this circuit. This video shows how to stop the exploding capacitor problem, and also shows another variation which produce plenty of power.
12V To 24V DC-DC Converter
Wednesday, January 04, 2012 5:00:15 AM
what is leg 9?
brij sahu jhansi india
12V To 24V DC-DC Converter
Wednesday, December 07, 2011 4:08:57 AM
This is a great circuit .i used in my car to play computer woffers. {usb players} wich is operatied 24 volt dc . when i went a long drive i enjoy with woffers.
12V To 24V DC-DC Converter
Thursday, September 29, 2011 12:49:25 PM
hi every one... what is the efficiency of this circuit ?
12V To 24V DC-DC Converter
Tuesday, September 27, 2011 1:54:35 AM
For D2, would it be OK if I change it to diode 1N4148?
12V To 24V DC-DC Converter
Monday, May 09, 2011 3:03:30 AM
This is a great circuit, but if you want a really easy boost converter, just go buy a pwm chip (they make ones for this exact purpose).
12V To 24V DC-DC Converter
Friday, February 18, 2011 11:17:39 PM
Hello everyone I love this circuit but I want to find out if I add more power transistors to this circuit if it can handle higher currents. Please send coments to my email thanks
12V To 24V DC-DC Converter
Thursday, January 06, 2011 11:53:32 AM
Hello everyone, we finally got this circuit working. For Q1, we had to replace BC337 with BC331 because BC337 wasn't strong enough and kept getting fried. BC331, however, requires a heatsink as well, so don't forget that. Also, as L1 we used a serial connection of 1.7 mH and 0.2 mH inductors. The L1 mystery has been solved at last. :) Cheers.
Hinkus Pooper
12V To 24V DC-DC Converter
Sunday, December 05, 2010 11:14:21 PM
Can I get 43Kw from this circuit or will I need a heatshink ?

(Editor's notes: Uh, no.)

12V To 24V DC-DC Converter
Sunday, November 07, 2010 6:19:04 PM
Can author of this circuit please post inductance of L1 since there is no info about permeability of toroidal core?
12V To 24V DC-DC Converter
Thursday, November 04, 2010 7:12:43 PM
Please give us more information about L1 because it's hard to calculate exact inductance without info such as permeability. Best option would be to give us exactly how many henries there should be. Thanks.
sony bagus
12V To 24V DC-DC Converter
Monday, October 18, 2010 4:18:29 AM
Inductor L1 can I substitute with a relay ? And use from a relay 12vdc 1 A (only solenoide) ?
Ryan B.
12V To 24V DC-DC Converter
Monday, October 11, 2010 3:32:01 AM
What is the current drawn by this circuit? What is the current input requirements, and what is the output current of this circuit? please send it to my email add, many thanks....
12V To 24V DC-DC Converter
Tuesday, August 24, 2010 3:08:36 AM
I simulated this circuit in Multisim. Works good. If you setup a voltage divider off your output sample instead of feeding back the whole voltage to the first opamp. You can raise the output voltage. I tried 24K and 100K resistor values.
12V To 24V DC-DC Converter
Wednesday, June 30, 2010 3:04:41 PM
I wonder if I can get a higher voltage from this(26V)? If yes, which modifications need to be done to the circuit(note: if possible the input mustn't chande)?
12V To 24V DC-DC Converter
Saturday, February 06, 2010 7:09:02 AM
hi! newbies here, i just need for some advice on inductor(L1) that can be easily bought in the market... is there any board that you can use to temporarily insert those parts in the diagram (like breadboard)?... thanks in advance
12V To 24V DC-DC Converter
Saturday, January 02, 2010 7:52:22 PM
this transistor is not the correct choice.. when i tried it got burned D313 npn transistor effective enough to give 22.3 voltage at the node with fr diode 1n5819..... it really works
12V To 24V DC-DC Converter
Saturday, December 26, 2009 7:57:55 AM
DC-DC converters are important in portable electronic devices such as cellular phones and laptop computers, which are supplied with power from batteries primarily. from -svtelindia
12V To 24V DC-DC Converter
Tuesday, December 22, 2009 2:52:11 PM
I couldn't get this circuit to work and have checked my worl several times, is this schematic correct?
12V To 24V DC-DC Converter
Wednesday, December 02, 2009 1:41:54 PM
How many current can supply this device?
12V To 24V DC-DC Converter
Saturday, November 28, 2009 3:13:56 PM
Hmm, The emitter from the transistor(q1) should be on ground right?

(Editor's notes: Yes. I will correct the schematic soon. )

12V To 24V DC-DC Converter
Thursday, November 19, 2009 1:02:12 AM
It seems the circuit above is wrong. Q1 would never open because there is no difference of potentials between base and emitter
12V To 24V DC-DC Converter
Sunday, October 18, 2009 6:20:00 PM
Any specs on the inductor? For example if I wanted to buy one instead of making one? Thanks
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