An old-style episode in which I show you how to make a simple regulated power supply from a power supply removed from a laser printer. First, I tell you a little about how such power supplies work, then we make the necessary calculations, minor modifications, and check that everything works as it should. =============== Table of contents ============== 0:00 Introduction 0:25 A look at the hero of the episode 2:08 Starting up the power supply for the first time 4:26 A little about how switching power supplies work 7:57 What needs to be changed and how? Some calculations 12:40 Quick reverse engineering and rework 14:11 Did it work? 16:49 Summary, ending ======================================= Most frequently viewed: Movie player with VFD display: • How I made an old display ... Extending the life of LED bulbs: • How to extend the life of an LED bulb? Arduino from electronic scrap: • Free Arduino from garbage, how to make... Changing the charging current in a battery rectifier: • Changing the charging current in a rectifier ... Data recovery from a phone: • Data recovery from a dead phone. I... DIY graphics card: • Color graphics card built from... Checking electronic components with an ordinary meter: • Checking electronic components... Pure sine converter: • How to make an inverter with a pure sine... Repairing a large switching power supply: • Repairing a switching power supply; What's... Simple 12V to 230V converter: • 12V to 230V converter, simple and ... 12V switching power supply repair: • 12V switching power supply repair; Sp... ATX power supply repair: • ATX power supply repair. How is it built... Simple air ionizer: • How to make an air ionizer? ZVS, ... Triac power regulator, dimmer: • How to make a triac power regulator? ... Adjustable voltage regulator on a mosfet: • How to make an adjustable voltage regulator on a... Biggest projects: Movie and music player: • I built my own movie player with... Audio codec: • I made a codec better than MP3! Con... Stereo sound card: • Sound card built from scratch. Go... Network power meter, energy meter: • Network power meter, energy meter... LCD display controller: • Graphics card for LCD displays. ... Programmer for GAL and PALCE: • I built my own programmer for GAL ... Computer on Z80: • Computer on Z80 built from scratch, pr... Universal parallel memory programmer, Easy Prog: • How to build a universal programmer ... 8-bit computer: • 8-bit computer Pure sine wave inverter: • How to make a pure sine wave inverter... Programmable 8x8 display: • How to make an 8x8 display controlled ... High-power induction heater: • Efficient induction heater, circuit... Remodeling a large TV converter: • Remodeling a switching power supply. How ... DIY oscilloscope: • DIY oscilloscope