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That’s pretty close to the 2. Your Password Forgot your password?

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Any clue what could be the cause? Already have an account?

There are lots of resistors, how would we know which are the ones we are looking for? Nice, but how do we identify the voltage divider? Become a member to follow this project and never miss any updates Become a member. If R2 is 1kOhm, you have:.

Modifying a notebook power supply |

It’s a great guide. The only problem I could think was the current flowing to the comparator through the optocoupler, so I changed the old Ohms resistor to a 1kOhms resistor and tested the the circuit again. All good, but the capacitor starts discharging over time, and so the output voltage starts to drop.

Over voltage protection could be a problem with this, but I have not figured out how to bypass it yet. The feedback circuit notices this and, when the voltage is below the threshold, it tells the control circuit so, which closes the switch again. These steps keep repeating, maintaining the output voltage at the desired value.


For the R42, I’ve put a single 10kOhms resistor. Some undervoltage protection, or??? Feedback circuit working like a charm.

As the current flows into the capacitor, the output voltage starts to rise. View all 3 project logs. The idea behind it is modifying a 19V 65W notebook power supply to output 24V. Similar projects worth following.

Yes, delete it Cancel. Test the power supply with a variable voltage power supply.


As you want a specific voltage on the output low voltage sidethe feedback circuit tells the control circuit vatasheet the output voltage is below the desired voltage.

It’s now time to actually modify the notebook PSU. Modifying a notebook power supply Modification of a notebook power supply to output a desired voltage. Using a voltage divider. Also, when I changed the voltage on the variable power supply, I could see the voltage on pin 2 changing according to it.

Without load, voltage is stable??? A simple variable power supply based on the LM Has anyone solved this problem? The images below are purely educational. When you turn on the power supply, the switch is open and the capacitor is discharged, at 0V.

When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor. The comparator will now tell the control circuit to stop charging the capacitor. Disconnected from the mains, put everything back into the case and 103iaw again to make sure.

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Now, suppose your output voltage keeps raising and reach 5. This will be explained in the next post. When it reached around 23V, the output changed. A better view of the 103wiw Did’nt bother much more due to the PCB being covered in thermal glue hiding the circuit. This finishes the explanation of how a SMPS works.

Calculating for 24V, the divided voltage would be 2. You should Sign Up. The voltage divider I wanted was connected to pin 2 of the comparator IC. You are 103akw to report the project ” Modifying a notebook power supply “, please tell us the reason.

Do you have any ideia what’s that iron core transformer doing on the top side of the board? But when I connect even very small load, it shuts off.

The half of it is 2. Hello, i have the same problem as users above: Suppose your output voltage was at 4.