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Hi.

I have made an unregulated DC power supply with some dot matrix printer transformer, it outputs(at 120v input)7V and 28V AC. I've rectified it and filtered it, and it's 9V and 40V DC. I took the 9v output, and placed three LM7805s in parallel. After that, I filtered it more with capacitors. Thing is, I attached an USB female plug to it, to charge phones, but only some phones charge. Some say that the supply doesn't gives enough current. I guess that they try to negotiate USB power(more than 100 mW) but it can't as it's just a PSU.

Is there a way to fool the phone into thinking that it has it's original charger and not some contraption I made?.
Good Enough Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 GA-990FXA-UD3 RX 480 Nitro+ (Passthrough) + XFX 5770 (Secondary) Kingston HyperX (4x4GB) 
Hard DriveCoolingOSMonitor
3x Samsung Spinpoint F3 Hyper 212 EVO Fedora 25, W8.1 virtualized with KVM + GPU Pass... ASUS VS228H-P 
PowerCaseAudio
Corsair TX650 CM Elite 330 Onboard ALC889 + HDMI Passthrough 
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Good Enough Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 GA-990FXA-UD3 RX 480 Nitro+ (Passthrough) + XFX 5770 (Secondary) Kingston HyperX (4x4GB) 
Hard DriveCoolingOSMonitor
3x Samsung Spinpoint F3 Hyper 212 EVO Fedora 25, W8.1 virtualized with KVM + GPU Pass... ASUS VS228H-P 
PowerCaseAudio
Corsair TX650 CM Elite 330 Onboard ALC889 + HDMI Passthrough 
  hide details  
Reply