DC-TO-DC converter

Conversion of AC to AC is quite simple as in compare to DC to DC converter because it only implies a transformer which converts AC from one voltage level to another voltage level. But conversion of DC to DC is quite tedious work without transformer and more power losses. Here is simple, low-cost, high precision circuit which converts 6-V DC to 12-V DC without using transformer and easy to construct with few component.

Circuit description of DC to DC conversion

The circuit of DC to DC conversion is build with a very popular IC LM555 used as multivibrator mood which generate required frequency range from 2 to 10 kHz to drive power transistor T2. Here potentiometer VR1 is used to adjust output frequency given to transistor T2 via resistor R3. A zener diode in this circuit is used as voltage regulator which regulates voltage to 12 volt.

Here Inductor L1 of 100 turns, 24 SWG enameled copper wire wounded on a 40mm dia. toroidial ferrite core and capacitor C5 is employed for energy storage. Transistor T1 is used to control output control with the help of resistor R4 R5.

6 volt dc to 12 volt dc convertor09


Resistors (all ¼-watt, ± 5% Carbon)

R1, R2, R5 = 10 KΩ

R3, R4 = 220 Ω 1/2-watt

VR1 = 47 KΩ


C1 = 0.0047 µF

C­2 = 0.01 µF

C3 = 0.1 µF

C4 = 470 µF/25V

C5 = 2200 µF/35V


D1 = 1N4007

D2 = Zener 12V, 500mA ½-watt

T1 = BC549

T2 = BD139

IC1 = NE555 timer IC


L1 = 100 Turns, 24 SWG insulated copper wire on 40mm Dia. toroidal core

8 thoughts on “DC-TO-DC converter”

  1. การเรียนรู้เป็นสิ่งที่สำคัญอย่างน้อยก็เกิดทักษะ แล้วนำมาใช้ในงานได้ครับ

  2. Good day

    Im looking for a circuit similar to this that takes 12vdc and converts it to 14.5 vdc. I want to charge a deep cycle battery that is about 8m away from the 12Vdc alternator. I have worked out the volt drop over this distance and i would have to use to big cables to reduce volt drop. The deep cycle battery needs 14.5Vdc to charge propperly at about 4amps. Please could you help

  3. My problem is a little differnt in that as my solar panels are producing too much voltage. i need to reduce the input from the PV from 150vdc to 135VDC. The panels are rated at (CC)200 watts @ 25 volts(OC of 48 volts) Without having to throw away my PWM charge controllers would it be practicle to use a DCtoDC converter to reduce the input DC voltage. Thanks

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