Here is a easy circuit of a DC to DC converter using LM317T IC. LM317 is a very famous IC comes in TO 220 package. This high performance IC has a lot of good features like input supporting voltage from 3 to 40 volt DC and delivers regulated output from 1.25 to 37 volt DC with 1.5A output current. 



The IC also contains build in current limiter, built in thermal overload protection and safe area protection. The circuit mentioned here will perform the task of step down fixed voltage DC to DC converter. There are many fixed voltage DC to DC step down converter ICs are available in the market like LM7805 for DC 5 volt fixed output, LM7809 is for DC 9 volt fixed output etc. But LM317 is a single IC from which you can get any fix output voltage between 1.2 to 37 volt DC by using suitable values of resistor R1 and R2. The output voltage chart mentioned below will help you in choosing the suitable value of resistor R2 to get the desired output voltage. You can also use the LM 317 voltage calculator chart mentioned here: http://www.muzique.com/schem/lm317.htm In this calculator you can also adjust the value of resistor R1 between 150 to 470 ohms to get the desired output voltage. The input voltage must be 2 to 3 volt greater than the output voltage. Use a suitable heatsink with the IC. You can also use a variable resistor in the place of R2 if desired more details are here 1.25V - 37V 1.5A Variable / Adjustable Power Supply Using LM317.

  





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DC to DC Converter Circuit
LM317 OUTPUT VOLTAGE CHART
RESISTOR R2
OUTPUT VOLTAGE DC
680 Ohms
4.79
750 Ohms
5.16
820 Ohms
5.52
910 Ohms
5.99
1000 Ohms
6.46
1100 Ohms
6.98
1200 Ohms
7.50
1300 Ohms
8.02
1500 Ohms
9.06
1600 Ohms
9.58
1800 Ohms
10.63
2000 Ohms
11.67
2200 Ohms
12.71
2300 Ohms
13.23
2500 Ohms
14.27
2700 Ohms
15.31
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