First post, by adalbert
Recently i had to replace the internals of my T3200SXC power supply and now it runs with modern DC-DC converters (Pololu) and laptop power brick instead of AC power. This is probably the first time that laptop got chance to get some real "portability", so I wondered if I could run it off battery. I have Mi Power Bank 3 Pro with PD output rated up to 45W, which is the peak power draw of that laptop with hard drive, audio and ethernet installed.
I bought some USB-C PD power triggers ("PD23.0 PD decoy module", there are 9/12V and 15/20V versions), attached DC power jack and turned the laptop on. Because of high starting current (HDD spinning up) a low ESR capacitor attached (25V around 1000uF) to the cable is needed, or the powerbank would shut down.
It works just fine with 15V or 20V setting with T3200SXC (again I have custom power supply here, later i will mabe put schematics somewhere) and 20V with PCD-5ND (pentium 90MHz). 12V version would probably be enough to run 386 and 486 mainboards with Pico PSU or similar adapters 😀 I was also able to run HP DeskJet 340 with 9V setting (beware of reverse polarity), soldering iron and bunch of other stuff.
Note: using additional capacitor has a small drawback: powerbank won't turn on if there is short time between plugging it on and off, because capacitor stores the voltage and powerbank thinks it's being charged, or something like that. Maybe a very small resistor between the leads (100k or so) used to discharge the capacitor would help.
Repair/electronic stuff videos: https://www.youtube.com/c/adalbertfix
ISA Wi-fi + USB in T3200SXC: https://www.youtube.com/watch?v=WX30t3lYezs
GUI programming for Windows 3.11 (the easy way): https://www.youtube.com/watch?v=d6L272OApVg