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 down 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.