18v power supply using lm7818


Posted on Feb 6, 2014

This power supply will work accurately where you have the need of stable 18V DC and provides current upto 1. 5A. The circuit is using a LM7818 positive voltage regulator IC. This IC has many built in features like internal current limiting, short circuit protection, thermal shutdown, safe area protection etc. The 230V to 18V 2A transformer step dow


18v power supply using lm7818
Click here to download the full size of the above Circuit.

n the mains voltage and the 2A diode bridge rectify the voltage and convert it to DC. The 2200uF capacitor fiters the voltage comming from the bridge diode. 1N4001 diode is used to block feedback to the IC. The Voltage regulator IC steps down the input voltage and provides 18V DC ouput. Use a suitalble heatsink with the IC.




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