Although most of the power supply circuits on this page are relatively outdated, they still show the same basic concepts that our modern solid-state devices have replaced. Many power supplies today still use the same circuits as those in the mid-50s. You are looking at many power supply circuit diagram. The various electronic projects need to use them as an energy source. There are a lot of circuits categories: power supply. But sometimes you want to save time and get some ideas. So, I recommended the circuits with PCB lists below. Also, they are easy to build and Cheap. A bench power supply is an extremely handy bit of kit to have around for electronics hobbyists, but they can be expensive when purchased from the market. In this Instructable, I will show you, how to make a variable lab bench power supply with a limited budget.It is a great DIY project for beginners.
The schematic in my DB of reverse engineered schematics:Today I made a teardown of an industrial switching power supply module S-120W-12 in a metal housing. The input is 100-240V AC mains and the output is 12V DC 10A 120W. It came from Ebay and it cost me only $8. In the listing it's called 'switching power supply LED driver adapter', but it may have a lot of uses other than just powering LED strips. The SMPS is based on the old good UC3842 control chip, TL431 voltage reference and an 817 optocoupler.
It has an open loop protection added, made of discrete transistors. It also has a softstart, a proper fuse, NTC thermistor, safety capacitors, snubber networks, EMI filters, good isolation distance and a relatively safe-looking transformer. The only problem of this switching power supply is the way the power transistor and diode are mounted on the heatsink! Just the sharp corner of it actually touches the aluminium plate! This video got quite long, but it's not easy to cover such a complex appliance in just few minutes.
Atx Power Supply Circuit Diagram
I didn't even get to explain why is the power supply clicking when in short circuit and why it may produce audible noise (whistling) if there was no slope compensation.You can support me on Patreon.