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Description: You might have an old SMPS laying around. But you dont need it anymore so what can you do with it? Well let's take it apart... salvage some important components from it.

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Background music: Killing time, Kevin MaCLeod,
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Tags: smps electronic components

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  1. Date: June 27, 2017 at 09:27
    Author: KryptoKnight

    bhai video toh bahot informative thi <3 but try to upload in other quality or format, I get only two options, 720p and 360p 🙁 I wanted 480p tho lol, anyways great video bro :3

  2. Date: June 30, 2017 at 19:04
    Author: Black Widow

    Hey man great video I love it
    I subscribed can you subscribe to my channel it would mean the world to me

  3. Date: July 12, 2017 at 16:06

    It's worth mentioning, this is a PWM SMPS circuit. If you want a bench power supply you should modify a peak mode controller type. Peak mode controllers are more common to laptop/printer power supplies and phone chargers.
    A couple of other friendly points to note from a fellow hobbyist. That circuit should have had at least one voltage reference. They are usually TL431's. The best are TL431B's @0.5% and TL431A's @1% accuracy. These are usually in a TO-92 Transistor package. These are super handy devices to learn to use effectively.
    The diodes in the TO-220 package that look like transistors are high speed versions needed for SMPS.
    Most ATX supply hacks fail because of 2 reasons. One, they are designed for a specific type of load. The main rail must have more current drawn from it. The feedback circuit references are only done on a single power rail. The other output rails are only regulated through their turns ratio relationship to the main rail, and the controller has no direct relationship to them. These extra rails must drag down the main rail through indirect coupling in order for the controller to "see" and compensate for it. This is why their voltages seem to vary depending on the load applied, where as the main rail appears to be better regulated under load.
    The second reason ATX supplies fail is because these are PWM controllers. Peak mode controllers basically take a triangle wave and increase or decrease the slope of the waveform. This topology only requires one comparator on the chip. PWM controllers are the heavyweight contender that takes SMPS to a whole new level. It's capable of doing a lot of different things because it has 2 independent comparators that can add all kinds of functionality. For the hobbyist the ideal use of PWM is to design your own SMPS with Voltage and Current control. One comparator is used to sense voltage and one to sense current. These 2 comparators are why mods like what Jeremy did on his Great Scott! channel fail. You must understand how both comparator circuits are designed before trying to mod them. If only one is modified it will create problems.
    Lastly, if you have a working ATX supply or really anything you want to upcycle parts from (and your comfortable with working on AC mains circuits), you should power it up and explore what is happening on the PCB before parting it out. You can either create an isolation transformer by using 2 identical transformers back to back in series or put an incandescent light bulb in series with your hot wire of your AC mains line. Both of these cheap tools create a current limit that will prevent massive short circuits that relay on the mains circuit breaker/fuse.
    Early on I neglected exploring a lot of devices before parting them out. This makes a lot of headaches later after you learn how to play with some new part of the circuit. Nowadays, I usually note voltages everywhere on the PCB before taking things apart. Transformers are particularly difficult to figure out once the board is partially disassembled. If you note the voltages of each pin of the transformer along with where it's coming from/going to, you will be able to figure out a lot of the circuit later. If you have a meter that can measure frequency or the circuit is isolated and you can use a scope to measure the frequency, the transformers become extremely valuable for future use. I usually write all this on the PCB/transformer with a permanent marker. If you have the voltage, current, and frequency of the transformer output you can reverse the equations and figure out how to add them into a future project. That's just a bit of what I've learned/am learning while exploring SMPS in depth. I let myself get side tracked exploring a component tester in extreme depth, but that's really just a tool I need for exploring SMPS controllers further in the near future.
    Best of luck from your newest Sub, -Jake 😉

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