• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright | Videos | Circuits for Beginners | Basic Circuits | Hobby Projects | Transistor Circuits | LED Drivers 

You are here: Home / Mini Projects / Simplest One Transistor Regulated Power Supply Circuit

Simplest One Transistor Regulated Power Supply Circuit

Last Updated on October 26, 2021 by Swagatam 11 Comments

caution electricity can be dangerous

The article explains a simple variable regulated voltage power supply circuit which utilizes just a single transistor. The design can be very handy for the new electronic hobbyist

Main Features

The explained power supply includes an adjustable voltage feature which is an essential feature for every electronic enthusiast. However making one such power supply within minutes using a handful of components might look difficult.

The circuit of a simple variable voltage power supply using just a single transistor referred here shows us how to build one such unit quickly using common parts from your junk box.

This single BJT regulated Power Supply is easy to construct. It takes less than an hour on a piece of copper-laminate.

All the components can be mounted as show in the aforesaid diagram, cutting the strips for placement.

Moreover the board also acts as a heat-sink. Enamelled wires are used to connect the components and the transistor gets bolted to the board, acting as a cooling agent.

Circuit Operation

The circuit is designed for use with old C," "D", and even lantern batteries. That’s the reason for no diodes or electrolytic. Get some old batteries and connect together to receive 12v – 14v, at least.

The power for this output is controlled by a 10v zener, made by following the characteristic of zener voltage of 8.2v in between the base-emitter leads of a BC547 transistor, in a reversed bias, and 1.7v approx. across one Red LED. The circuit is designed to deliver 0v-9v at 500mA.

However the deliverance depends upon the life of the cells being used. The 10k pot works to adjust the output voltage and thereby the LED circuit goes in ON state.

A good part is that the circuit is well designed to fetch the last leg of energy from old cells.

Submitted By: Dhrubajyoti Biswas

Circuit Diagram

You'll also like:

  • 1.  Temperature Controlled Relay Switch Circuit
  • 2.  3 Simple Solar Panel/Mains Changeover Circuits
  • 3.  Simplest Windmill Generator Circuit
  • 4.  3 Smart Li-Ion Battery Chargers using TP4056, IC LP2951, IC LM3622
  • 5.  Simple MOSFET Tester and Sorter Circuit
  • 6.  Easy Two Transistor Circuit Projects for School Students

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Have Questions? Please Comment below to Solve your Queries! Comments must be Related to the above Topic!!

Subscribe
Notify of
11 Comments
Newest
Oldest
Inline Feedbacks
View all comments

Primary Sidebar

Calculators

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (98)
  • 741 IC Circuits (19)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (114)
  • Battery Chargers (82)
  • Car and Motorcycle (94)
  • Datasheets (46)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (100)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (116)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (13)
  • GSM Projects (9)
  • Health Related (20)
  • Heater Controllers (29)
  • Home Electrical Circuits (102)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LED and Light Effect (93)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (65)
  • Mini Projects (148)
  • Motor Controller (67)
  • MPPT (7)
  • Oscillator Circuits (26)
  • PIR (Passive Infrared) (8)
  • Power Electronics (34)
  • Power Supply Circuits (77)
  • Radio Circuits (10)
  • Remote Control (48)
  • Security and Alarm (61)
  • Sensors and Detectors (121)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (60)
  • Timer and Delay Relay (53)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (40)
  • Ultrasonic Projects (16)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations

wpDiscuz