9 V regulator using 7809


Here is the circuit diagram of 9 V regulator using popular 7809 IC. The 7809 is a 9 Volt voltage regulator IC with features such as internal current limit, safe area protection, thermal protection etc. A 16 V transformer brings down the 230V mains, 1A bridge rectifier rectifies it and capacitor C1 filters it and 7809 regulates it to produce a steady9V DC output.

Circuit diagram with Parts list.



  • If a current of 300 mA or above is required, fit a proper heat sink to the IC 7809.
  • If 1A bridge is not available, make one using four 1N 4007 diodes.

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