9 VDC Regulated Power Supply

9 VDC Regulated Power Supply

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Tiny low current 9 VDC Regulated Power supply designed around bipolar transistor and zener diode. The circuit is known as series voltage regulator or emitter follower voltage regulator. The unregulated supply fed to input and the circuit regulate the voltage and provide constant 9V DC, 250mA. The zener diode provides the reference voltage to the base of the transistor. This is very suitable power supply for small projects as it can provide any supply output by changing just the zener diode.

Other output voltage can be obtained by changing the zener diode

Output Voltage Formula Vout=Vz-VBe

Vz=Zenner diode Voltage, VBe=0.7V

9 VDC Regulated Power Supply – [Link]

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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2 Responses

  • 14 July, 2016 at 4:32 pm

    The author forgot to mention that a heatsink must be used on the transistor if the output current is high and the output voltage is low.

    • Electronics Lab
      15 July, 2016 at 11:39 am

      Thanks for mention this. I updated the project page.

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