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Today I has the 12Vdc to 9V DC converter step down voltage circuit come to advise, it uses easy. Because use the integrated circuit LM317T. Read next you will think to are like me
This little circuit uses a LM317 variable voltage regulator to adjust the input voltage down to +9 volt, or whatever else you need. Just a solid basic circuit without bells and whistles.
You can do with a 10uF capacitor for C1 if your battery is close to this circuit. If it is located more than 3 feet increase the value to 100uF or above. Without a coolrib it can easily handle 500mA. If you need more, or the maximum current (1.5A), then a good coolrib is required. It can even provide up to 2 amps with a good coolrib and a fan.
Read Source: http://www.uoguelph.ca/~antoon/circ/ps-lm317.html
Have a COOL Wednesday!
