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There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components. The part closest to the AC power cord is the input high voltagethe middle part is the control circuit high voltage and the part closest to the DC output is the feedback circuit low voltage.

The comparator will notice that 2. Testing pin 3 I’ve read 2. It was not that precise, but well, there it was. I have the same problem like David with modifying 20V Fujitsu Siemens laptop power brick. The comparator will now tell the control circuit to stop charging the capacitor.

Any clue what could be the cause? Yes, delete it Cancel.


Modifying a notebook power supply |

For the R42, I’ve put a single 10kOhms resistor. It’s done, now your power supply outputs the desired voltage. Disconnected datasheft the mains, put everything back into the case and tested again to make sure.

Using a voltage divider. View all 3 project logs.

Shipping 103AIW TSM103AIW Free constant current driver SOP-8 IC

Some undervoltage protection, or??? Using the continuity test, I found the resistors to be R40 and R You are about datasyeet report dafasheet project ” Modifying a notebook power supply “, please tell us the reason. I didn’t have any good values to change only one resistor of the divider, but I’ve found ddatasheet R42 and R43 unpopulated at the time were in parallel to R You would be comparing the half of 4.

That helps a lot. If R2 is 1kOhm, you have: You should Sign Up. No blue magic smoke. Here, take a look at the same image with the subdivisions: The name “switching” comes from this switch. The image below is a real SMPS maintaining it’s output voltage. Let’s take a closer look: Your Password Forgot your password?

When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor. Did’nt bother much more due to the PCB being covered in thermal glue hiding the circuit.


Sign up Already a member? The Hackaday Prize. This project was part of my Soldering Station project. It will deliver up to ma of current with current limiting.

Let’s use a R2 as 1kOhm and calculate R1 to make our voltage divider. Wait at least one minute after disconnecting it from mains before handling it again while open. As you want a specific voltage on the output low voltage sidethe feedback circuit tells the control circuit that the output voltage is below the desired voltage. A better view of the optocoupler: I think is DAP8A some protection.

datashert If we compare this voltage divider to the one at the previous post, R40 is R1 and R41 is R2. There’s no real secret to that. You can see the positive and negative outputs, the main controller comparator and reference voltage and the connection to the control circuit, through the optocoupler.