5V power supply using 7805.


7805 is a 5V fixed three terminal positive voltage regulator IC. The IC has features such as safe operating area protection, thermal shut down, internal current limiting which makes the IC very rugged. Output currents up to 1A can be drawn from the IC provided that there is a proper heat sink. A 9V transformer steps down the main voltage, 1A bridge rectifies it and capacitor C1 filters it and 7805 regulates it to produce a steady 5Volt DC. The circuit schematic is given below.

Circuit diagram with Parts list.



  • The bridge D1 can be also made by yourself by using four 1N 4007 diodes.
  • If more than 400mA current is supposed to be taken from the circuit, fit a heat sink to the 7805 IC.
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