Many electronics circuits and projects for learning in simple ways.

12v to 6v step down circuit

This is the 12v to 6v step down circuit for you. When we want to use the radio carrying a car that uses a power supply of 12 volts, but these radios require a voltage about 5 to 8 volts.

Normally, We always use a 3 pin DC voltage regulator(IC78XX series) for this job. Which may be will apply number 7806 provides the voltage of 6 volts. But it does not a popular number. In my stores have IC-7805 is popular IC is applied in many digital circuits (5 volts power supply).

The step down 12 volts to 6 volts DC converter
The step down 12 volts to 6 volts DC converter

However, we modify a 7805 to the output of 6 volts in easily. When we add a chain of a diode such as 1N4148, in series at between the common pin of IC1 and Ground. It will increases the output by +0.7V for every diode used.

In the circuit below. We add 2 diodes (0.7V + 0.7V). Therefore, the voltage of output is 1.4V + 5V = 6.4V.

This way is easy if you have diodes in your store.

And both capacitors are used for absorbs or smooth a fluctuating signal as shown in Figure 1.

How to build it.

Since they use a few parts, so assemble them on perforated board or Universal PCB board. as Figure 2. We will see that the output voltage is voltage drop across both diodes (0.6V + 0.6V) puls with The IC voltage equals about 6.2 V approximately. (on digital multimeter shows 6.4 volts.)

Assemble-the 12v to 6v step down circuit on the perforated board

The output current from the IC about 1-ampere max. It must be the heat sink to the IC with the current size. And Then we can increased output voltage in other sizes such as 8 volts so can use instead IC is number of LM7808, to add diodes into 4 pcs connected to IC-7805. again.

If this not working.
If IC1 is very hot please check pins and wiring again.
The output may be a short circuit.

Then, remove the load
next, measure voltage output when no load, should read about 6.4V.
If higher, please check IC1’s the ground pins and all diodes in series, the voltage across them should about 1.2V

Good luck.

Buy components in this projects HERE!

Also 12v to 6v step down circuit

We have many ways to reduce voltage down to 6V. All circuits below are 6V regulators.
You can apply it. With choosing 6V step only.

This Post Has 4 Comments

  1. Hello

    I tried this circuit for powering my led emergency light which runs on 6v. As i only have 12v batteryy. At first it worked for 5 minutes then transistor got very hot, i attached a big heatsink with 7805. After few minutes it just turns off. I tried testing voltages using MM. When my led is off it shows voltage of 7.5v(I connected 4 diode), but then as i turns on my lamp, voltage drops to 1.2v? What do u think might have happened?

  2. Hi, Clarkdale44
    Thanks for interesting question.

    Please Read in text.

  3. I need help! I want to take a 400-500watt computer PSU, use the 12v wire rated at 12-14 amps(there are 2 wires that are powered this way) and reduce it to between 6.8-8.4 volts with a max peak amperage draw of 20 amps. Please help, I found something from the golf cart work that can do this but I’d like to know how to do this so I can make it myself. Email me anytime day or night as this is a pivotal part of my prototype project

  4. i like it

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Close Menu