## Variable Power Supply 0-24V – 2N3055

The 2n3055 variable power supply circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit protection with acceptable regulation and a ripple free supply and yet uses very few components.

The transformer used is a readily available 12V-0-12V, 2A type connected at the end terminals for 24V, 1A output. After rectification and filtering, a constant reference voltage is obtained by the 24V, 500mW zener diode.

PARTS LIST | |

R1 | 1kΩ 0.5W |

R2 | 820Ω 0.5W |

R3 | 0.6Ω 1W |

VR1 | 470Ω LIN |

VR2 | 10K LIN |

VR3 | 10Ω 1W |

C1 | 2200µF 50V |

C2 | 200µF 50V |

D1 | 5A Diode Bridge |

D2 | 2A Diode |

D3 | 24V 500mw zener |

T1 | 2N 3055 |

T2 | SL 100 |

T3 | BC 148B |

X1 | SEC 24V, 1AMP |

The pots used for voltage variation are 23mm carbon-film linear type and for current limit 10 ohm, 1w wirewound type is used. All the components can be connected on a group board. Necessary heatsinks should be provided for both SL100 and 2N3055.

Also you can try below 2n3055 power supply circuit using LM741 op amp IC.

REGULATED POWER SUPPLY USING 741 AND 2N3055

**Please send your ideas, those are very important for our success…**

What is voltage regulation of 12V and 24V at full load current of 1 Amp?

Thanx for the help. I have designed 0-24V power supply using your given ckt diagram & It is working smoothly.

Thanx Thanx alot.

Can You Please mention how is the above circuit designed..? I mean the caluculations of resistence values and choosing particular transistors..?

This circuit is simple and usefull but not really stabilized its working without any error correction . thanks.

dear sir

what is the basic difference between smps and the above mentioned ckt

Smps is high efficient. So it save more energy. But this type (linear) power supply is simple,low risk for electrocution