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

Title	:	Simple 12 Volt to 9 Volt DC-DC Converter
Category	:	DC to DC Converter.
Tags	:	12vdc to 9vdc, 12vdc to 9vdc converter, dc to dc converter circuit, dc to dc converter diagram,

Post Related to Simple 12 Volt to 9 Volt DC-DC Converter:

5 Volt to 230 Volt voltage converter
I found this circuit from the Russian websites, and perhaps converter circuit is interesting. This circuit can convert 5 V to 230 V. It may be bit difficult to build, because as you can see in the schematic, most semiconductor ...

Simple Converter to Power UV Lamp
This simple converter to power UV lamp scheme is a simple converter to power the ultraviolet lamp low voltage. The power supply can be applied using the 6 batteries of 1.5V or a power supply with an output current of ...

DC to DC Converter 12 Volt to 21 Volt
Below is a schematic diagram of a DC to DC Converter 12 Volt to 21 Volt by using IC TDA2003. This 12 V to 21 V DC to DC Converter can perform nicely at 500mA maximum current. In case the ...

12v to 24v converter
Is often you need to install some equipment in a car that works with the 24 volt source. May not be a problem for buses or trucks which have the power to work with two batteries in series. But the ...

Mobile Phone Charger Powered using Solar Cell
To charge the 6-volt NiCd battery in this little device uses a miniature 3-volt solar battery. Battery, in turn, can charge many models of cellular phones and other portable devices. The circuit converts solar energy into a pulse current charging ...

Comments

6 Responses to “Simple 12 Volt to 9 Volt DC-DC Converter”

Daryanto Goentoro says:

July 13, 2011 at 6:26 am

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

Reply
- psu says:
  
  July 13, 2011 at 10:12 am
  
  no, this circuit can’t be used for 10A power supply. For 10A converter. Simply use this circuit: http://powersupply88.com/13-8v-10a-dc-regulator-circuit.html
  change the LM7812 to become LM7809.
  
  Reply
Laszlo says:

August 1, 2011 at 11:56 pm

Darianto,
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 laszloee@gmail.com.

Best.
Laszlo

Reply
dene helwig says:

November 16, 2011 at 12:41 am

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

Reply
- psu says:
  
  November 27, 2011 at 10:18 pm
  
  no, the value is correct. it should be in nanofarads
  
  Reply
bgk murthy says:

March 4, 2012 at 3:30 pm

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

Reply