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).

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.

## Building 12V to 6V converter

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.)

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.