I really like your technique for finding the positive, test for the noise filtering capacitors as they will show as a temporary short as they charge by the ohm meter 😉
@@RonMattino thanks. I failed to find a replacement battery to revive my old Samsung phone. I've been looking for an alternative solution. Hoping this does the trick
You can use 2 diode in series for more voltage drop but all normal schottcy diodes are between 0.4v~0.8v depend on forward current and higher power diodes reaching maximum voltage drop under load with maximum rated continuous current (sry for bad english btw)
And ofcourse using diodes for voltage drop is good for emergency setups or low power circuits because of the efficency and high power dissipate and diode getting hot but for low current its awesome and quick way if you havent bench power supply available and needing specific voltage
I guess 4.5 volts would probably be okay. Actually, the amperage should not be too low because the phone will need it when activating the transmitter. If it's too low the mobile may fail to start.
90% of batteries produced use 8k thermistors that produce 10k in room temperature. If 10k does not work, you may try 3k, or 47k, or 70k. That's common values I've come across. I would say, in most cases it's either 10k or 47k.
Наука
Every phone has its polarity marked. Unmarked polarity is a rare occurrence.
Polarity is always marked on the battery, not the phone. And if you don't have the battery, there's no other way of finding it out.
I will try this to revive my old phone
I really like your technique for finding the positive, test for the noise filtering capacitors as they will show as a temporary short as they charge by the ohm meter 😉
So educative and amazing
Which type of diode should we use? Is there a full version of this video?
Maybe this ruclips.net/video/Sb4aVHoeo90/видео.html
@@RonMattino thanks. I failed to find a replacement battery to revive my old Samsung phone. I've been looking for an alternative solution. Hoping this does the trick
Can I use any diode?
I used a regular diode with forward voltage 0.7v
You can use 2 diode in series for more voltage drop but all normal schottcy diodes are between 0.4v~0.8v depend on forward current and higher power diodes reaching maximum voltage drop under load with maximum rated continuous current (sry for bad english btw)
And ofcourse using diodes for voltage drop is good for emergency setups or low power circuits because of the efficency and high power dissipate and diode getting hot but for low current its awesome and quick way if you havent bench power supply available and needing specific voltage
@@moeinsp9622 thx il see effect on my multimeter but I'd already dismissed my comment because I knowed the diode
Why just now, i need this? Also, can I use dc 4.5 volts from transformer outlet provided that I lower the amperage?
I guess 4.5 volts would probably be okay. Actually, the amperage should not be too low because the phone will need it when activating the transmitter. If it's too low the mobile may fail to start.
Russian Ministry of the communications 😂
Excuse does diode stepdown voltage.
It has voltage drop
A ~720mV voltage drop
I did this to one of my old phone but ended up with white lines on the screen 😅
This probably means the the LCD is dead.😒
How do you know that it’s a 10k resistor?
90% of batteries produced use 8k thermistors that produce 10k in room temperature. If 10k does not work, you may try 3k, or 47k, or 70k. That's common values I've come across. I would say, in most cases it's either 10k or 47k.
I wonder how long it would last before dying
It won't last long, but the idea is to extract texts or images from an old phone if you need them.
@@RonMattino or if we have DC DC step down converter then we can use it indefinitely via any adaptor