- Joined Feb 1, 2019
I would like to convert my old atx power supply to give varible output but i don't want to put buck or boost converter or some other pcb in it.
You sprinkle it on an impossible problem and the problem is solved by magic. It helps if you believe in magical thinking.If you can ship it i would appreciate it,but can you tell me more specific what that is
If you had a schematic diagram of the particular ATX power supply we could tell you if it is doable or not. It is not doable, a priori, without looking at the design. It is not a simple question, nor is it a particularly simple thing to do. You have listed no REQUIREMENTS for this variable supply: such as voltage ranges or current requirements.It's not a ridiculous question,it's a simple question and it's a doable thing but i don't have the knowlege to do it so i asked for someone to help me not to judge me about my questions.
It would be well worth your time to take the PCB and create your own schematic of the existing board. Once you have the schematic we can advise you on what you would need to do to convert the fixed output to a variable one. I still don't see how you expect to get away without using additional components. Maybe you can use "flying component" or "dead bug" construction on the existing board. Would that meet your requirement of not having a "new" PCB?It uses tl494 chip that's all that i can say about it i can't find schematic for it because it's old
No, I have no clue what you are trying to say. An ATX power supply has one or more fixed output voltages. Usually these are +5VDC, ±12VDC, and maybe 3.3VDC. You are correct in saying that you can use these fixed voltages as INPUTS to buck or boost regulators to get other fixed and/or variable voltages. You can also go into the internals of the ATX power supply and modify it from fixed to variable output. Trying to do this on the basis of a YouTube video, without a schematic diagram, is foolish beyond words. There is no guarantee that the design you have is in any way related to the design in the video. Any suggestion that we are talking about a simple modification without understanding the design we are starting from is nonsense. If you want to do this for your own satisfaction, or as a learning experience, there is a way to do it. Trying to do it with a couple resistors and or potentiometers is doomed to failure because the voltage will change as soon as you connect a load and will bounce up and down as the load changes.First of all i have a lot of components.
Second i didnt mean pcbs that i make i mean like i don't want to buy buck or boost converter and put on the output.I think you get what i want to say.
I have this picture but i don't know if it works
Yes and i know how to build an ajustable switcherThere might be newer designs now.....but the problem with your idea is that the ATX has one switch......and all output voltages are controlled by that one switch. So if you dittle inside with that control......it varies all the other outputs. AND the atx was designed to operate at a defined range.
So......there is a lot working against your idea. That's why when someone wants to vary a ATX supply......they build an adjustable switcher and connect it to an existing output.
Does that make any sense to you?
That means that we didn't understand.But when you think of a switcher that's a different pcb.I have never designed a switcher. I was considering modification strategy only.
I don't know WTH you expect from us. You ask us how to modify a power supply with no part number and no schematic and no useful information. The answer is that without a speck of useful information I have no freaking idea how to do anything remotely connected to your requirements which you have also failed to mention.And also on that site i found that picture said that i need to somehow trick the safety future (when turns the psu off)and as i know that can be achived by bridging the optocoupler on the primary side but on mine psu there are 4 optocouplers so those that mean that i should bridge all of them or i should bridge the one that is responsible for the safety future
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by Lianne Frith