Simple 12 Volt to 9 Volt DC-DC Converter

12 V to 9 V DC-DC Converter

This DC-DC Converter schematic diagram is very simple with few components, making it easy to build. It can convert 9 volt DC voltage from 12 VDC source.

To obtain a much more accurate output voltage, change zener Z1 using 10V and resistor R1 with a 1 Kohm Variable resistor. A heatsink for Q1 is recommended. Very simple circuit to be able to power your 9 volt electronic equipment and some other stuff.

Parts List :
R1 = 560 ohm
C1 = 1000µF/16V ( Electrolytic Capacitor )
C2 = 100µF/16 ( Electrolytic Capacitor )
C3 = 330nF ( Ceramic Capacitor )
Z1 = 9.1V, 0.4 watt ( zener diode )
Q1 = ECG184, NTE184

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 12vdc to 9vdc 12vdc to 9vdc converter dc to dc converter circuit dc to dc converter diagram

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  1. author

    Daryanto Goentoro8 years ago

    is that 12vdc-to 9vdc usefull for 10A power supply ?? i have 12vdc 10A power supply, and i want to change to 9vdc 10A

  2. author

    Laszlo8 years ago

    The schematic is actually showing a very cheap Linear Voltage Regulator.
    Instead of “converting” it’s actually decreases the Voltage by dissipating the overhead (3V in our case)
    Smart, efficient converters are use some kind of higher frequency switching technique decreasing (or even increasing if needed) the output Voltage level.
    Boost Conversion for increasing, Buck conversion for decreasing.
    Answering your question, in theory it’s possible but not really recommended for such high power, since you’re going to dissipate( wasting, and need large heatsink ) about 30W at 10 Amps.
    I’m going to help you to work on some switching high efficient DC/DC converter just shot me an Email at


  3. author

    dene helwig7 years ago

    what is the value of C3 ? nf(nano farads) , shouldn’t it be pf, for pico farads?

    • author

      psu (Author)7 years ago

      no, the value is correct. it should be in nanofarads

  4. author

    bgk murthy7 years ago

    Looking to see if the same configuration could be used upto 5 amps load ?ic