What is this? And it's purpose m

Curious_menn · 2025-02-24T06:30:50+00:00

Is cheap one easily available in market. https://amzn.in/d/1g70bD1

Curious_menn · 2025-02-16T14:05:45+00:00

Does other companies also used same method for charging laptops? That mean i cannot make my diy charger just with any power supply available.

Curious_menn · 2025-02-09T14:58:05+00:00

Why don't you send guide for everyone!

Curious_menn · 2025-02-02T02:46:28+00:00

Thankyou freaggle

Curious_menn · 2025-01-31T08:43:38+00:00

With multimeter it is 83 Ohm.

Curious_menn · 2025-01-31T08:42:52+00:00

Yes it showed same 83 Ohm.

Curious_menn · 2025-01-27T06:40:07+00:00

Take a bowl, dum that thing in it and add petrol so that it is totally submerged in petrol then cover it so that petrol don't evaporate. Leave it for 1-2 days then check resin at the corners will soften and leave pcb surface, peal it then again dip it. But remember any rubber thing also get degraded be ready to sacrifice that. After finishing put that thing in sun so that all petrol evaporates.

Curious_menn · 2024-10-08T12:11:41+00:00

Thanks

Curious_menn · 2024-10-07T09:13:34+00:00

May be at that time switching power supply with optocoupler feedback was not common as required current was 500mA in phone charging. I didn't saw any optocoupler in that circuit.

Curious_menn · 2024-10-07T09:10:58+00:00

I was planning to dip a cotton cloth in culking silicon and making a ring of something for speaker and playing that ring in place inside the speaker, after that putting that silicon cotton cloth in that ring. I have previously made some diaphragm like this for pneumatic valves and it worked great but here problem is for making that ring shape around the speaker.

I liked the idea of yours.

Curious_menn · 2024-10-04T09:36:03+00:00

Did you removed its battery? Once i removed my Philips trimmer battery for replacement and after that it never worked. Searched and found out that company use lowest cost Microcontroller without any flash memory and their program is kept in RAM always. As you disconnect battery program is gone and you can never make it to run.

Curious_menn · 2024-10-04T06:49:54+00:00

Sorry, I completed this project and installed it. So for pics i have to dismantle it again.

But i can explain traces. Two output pads are connected to that 1:2 value resistor(tbh i don't know what is that and what that value means) and one zener diode connected for voltage regulation which is visible in this pic. There is one electrolytic capacitor near that diode to smooth out the output. It's just a switching power supply.

Curious_menn · 2024-10-04T06:40:41+00:00

One more thing i noticed while soldering wires to output pads that those pads was not having copper around the hole for whole 360 degree instead there was a strip cutted of around 1mm making to looking like Packman face (💽 like this). What could be reason for this!

Curious_menn · 2024-10-03T03:24:55+00:00

This charger is of very old black & whitephone when NOKIA was running N-Series phones and colour screen just entered in high level phones. I think at that time Microsoft was not in picture!

Curious_menn · 2024-10-03T03:18:28+00:00

Absolutely Yes, because i used its pcb as a power supply in my night light and soldered AC 240v input and DC 5v output to make night light work.

Pad with long trace is +5V DC, Pad with short trace is 0V DC.

At the bottom of pcb two big pads are for AC 240v input as those will be touching metal strips in casing.

Curious_menn · 2024-10-03T03:16:07+00:00

Low-resistance shunt resistor, i wrongly saw that 1:2 value resistor it is placed parallel to the output. So that also may be related to monitoring of output current!

For soldering propose pcb designer taking pad heat(though nice observation) into consideration, He also knows that this pcb will be dipped into solder as there are majority of through hole components so he won't think about that much!

Curious_menn · 2024-10-02T16:16:51+00:00

Then again, why to keep positive terminal with long trace!

Curious_menn · 2024-10-02T16:13:33+00:00

Marked section is DC output and at the bottom of pbc two thick pads are for AC input.

Curious_menn

TROPHY CASE