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Hello, i have the same problem as users above: The voltage divider divides the output voltage by a known constant and feed it to a comparator. A simple variable power supply based on the LM It will deliver up to ma of current with current limiting.

Disconnected from the mains, put everything back into the case and tested again to make sure. I connect the variable power supply to the power supply I want to modify and measure the voltage at the optocoupler.

Here, take a look at the same image with the subdivisions: Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage. You would be comparing the half of 4. What we want to do is to change the voltage divider, changing the voltage at which the comparator tells the control circuit to charge the capacitor. Now, suppose your output voltage keeps raising and reach 5. I’ve then put two 10kOhms resistors and one 1. For the R42, I’ve put a single 10kOhms resistor.

Modifying a notebook power supply

Let’s take a closer look: Become a member to follow this project and never miss any updates. Any clue what could be the cause? The oscillating start only with load. There are lots of resistors, how would we know which are the ones we are looking for? Feedback circuit working like a charm.



I didn’t have any good values to change only one resistor of the divider, but I’ve found that R42 and R43 unpopulated at the time were in parallel to Daasheet Having the datasheet of the comparator in hands always helps. This project was part of my Soldering Station project. SMPS are much more complex, but this is enough to give datashest good understanding on the theory of operation.

Suppose your output voltage was at 4. Yes, delete it Cancel. A better view of the optocoupler: Testing pin 3 I’ve read 2. Consider the output voltage at 19V and calculate the divider, you get around 2.

Grabbed my multimeter and tested the output: When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor.

You now have a voltage divider which halves your voltage. I managed to get up to Nice, but how do we identify the 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.

Modifying a notebook power supply |

Your Password Forgot your password? As the current flows into the capacitor, the output voltage starts to rise.

Using at voltage divider. Let’s use a R2 as 1kOhm and calculate R1 to make our voltage divider. Become a member to follow this datasheft and never miss any updates Become a member. That helps a lot. The images below are purely educational. You can see the positive 103alw negative outputs, the main controller comparator and reference voltage and the connection to the control circuit, through the optocoupler.


The original values were 15kOhms for R40 and 2. Do you have any ideia what’s that iron core transformer doing on the top side of the board? 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.

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We’ll need to open it, identify the feedback circuit and change the reference voltage divider. It’s easy to see where the inputs are. Does this project spark your interest?

I wiped my webserver and the images got broken. Your comparator will tell you if a value is higher or lower than 2. The Hackaday Prize. Else, if the value is lower than the voltage reference, the comparator tells the control circuit to keep charging the s, because your output value is lower than the desired value.

I’ll try to show in a very simplified way how a switch mode power supply works and how to change the feedback circuit so the power supply outputs the voltage you want. I’ve already identified the main parts on the feedback circuit.

Uploaded everything to hackaday.