Introduction: ATX Power Supply Recycled With Variable LM317
This project was started more than a year ago when it tried to reboot
floppy disk drives and CD / DVD drives, and the need to build a benchtop power supply. I think all hobbyist need to have a benchtop power supply as support for their jobs and experiences in their evolution and fun. This project is based on two conditions: the need for a benchtop power supply, and the recycling of electronic equipment (ATX supply). After searching through the dozens of projects on the internet, and after tens and tens of hours of watching videos and project diagrams, I worked out the layout of my setup with the idea of using multiple outputs at the same time, and still have an adjustable output.
ATTENTION!!! THE POWER SUPPLY IS ALWAYS OFF FOR THE ELECTRICAL OUTLET WHILE IT IS RIDING IT UP! DANGER OF MANY PAIN, IRREVERSIBLE DAMAGE AND EVEN DEATH !!!
Initially I was thinking of using a voltage regulator scheme, of the several I saw, but then I found this little circuit that uses the LM317 as a regulator and with positive references, and in this way I simplified a few steps and streamlined the process of building the bench source.
Some steps, such as opening the power supply and cutting wires and their identification can visit this link. This power supply has no 3.3V power.
Step 1: List of Materials:
Step 2: Tools:
- welding iron
- hot glue pistol
- fork wrench
Step 3: Construction
Some doubts have arisen with some components:
- switch - I chose this switch for wanting to have a headlight on the device when it was switched on, and when I bought it I had no instructions, and I did not find any datasheets ... after the consultation of those who understood the subject, explained the operation of this switch.
- digital voltimeter ammeter - This component is a success and it was easy to find information about your assembly.
- potentiometer - this component has been a uneasiness to my mind, because the potentiometer does not have a linear division in the voltage regulation. As the circuit of the LM317 is already built, I did not dare to modify it, but it is something that I will solve.
Step 4: Testing
Step 5: Conclusion
Overall, I am satisfied with this project, which will be very useful in the projects and works of hobbyist, and not only. This construction can be used as is, or be able to be detach the front panel and add to a modular panel with other appliances.
My english is not the best.
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