9 Volt 2 Ampere DC Power Supply Circuit Diagram

9 Volt 2 Ampere DC Power Supply Circuit Diagram

Circuit Description

There is little to be said about this circuit. All the work is done
by the regulator. The 7809 can deliver up to 2 amps continuous output
whilst maintaining a low noise and very well regulated supply. The
circuit will work without the extra components, but for reverse polarity
protection a 1N5400 diode (D1) is provided at the input, extra
smoothing being provided by C1. The output stage includes C2 for extra
filtering, if powering a logic circuit than a 100nF (C3) capacitor is
also desirable to remove any high frequency switching noise.

Circuit diagram:



  • C1 = 100uF-25V electrolytic capacitor, at least 25V voltage rating
  • C2 = 10uF-25V electrolytic capacitor, at least 6-16V voltage rating
  • C3 = 100nF-63V ceramic or polyester capacitor
  • IC = 7809 Positive Voltage Regulator IC
  • D1 = 1N5400 Diode

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