Host (baseband) controller in mobile phone

Hi mobile world I met many times the term “host controller” or “baseband controller” used interchangeably in the context of being the heart of the mobile. What exaclty is that, som SoC with CPU, GPU, GSM modem??? Answer Typically the ‘host’ refers to the master device/entity that belongs to the side of the computer. It … Read more

Charge controller for Li-ion or Li-Polymer battery

I am trying to work out the good charger for Mobile phones, which can serve as good performer for various smart phones out there in market these days & mostly using Li-ion battery. Charging has 4 stages — “the initial trickle-charging, then constant current charging, then constant voltage charging & finaly Top-up charge” — all … Read more

What is a Nokia FAID? [closed]

Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Electrical Engineering Stack Exchange. Closed 8 years ago. Improve this question Nokia is a mobile phone brand, but what is an FAID? I tried searching but no definition came up. I’m guessing … Read more

Can I connect directly a 3.7V 18650 li-ion battery to a mobile (cellphone)? [closed]

Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Electrical Engineering Stack Exchange. Closed 7 years ago. Improve this question If I remove the 3.7V battery from my mobile, is it possible to connect to the battery +/- terminals a 3.7V … Read more

mobile battery charging using voltage regulator?

Circuit shown at http://www.instructables.com/id/9v-USB-charger/ will that satisfy all condition of mobile charging through usb ? what is advantage of circuit shown at http://electronicsproject.org/mobile-cellphone-charger/ over above ckt Answer The Instructables circuit is horrible and shouldn’t be used. It: has none of the required capacitors for the regulator. lacks the resistive dividers on the D+ and D- … Read more

Mobile WIFI: how close can mobile devices be placed and still have a functional WIFI connection?

I wish to run a large array (50+) of hacked Android phones as a computing cluster. They will need to be networked so I plan to use their built-in WIFI radios to talk over a single WIFI network. (I have looked into having wired network for the phones but it turns out its not very … Read more

How is the output voltage of a mobile phone charger fixed to a rated value? [duplicate]

This question already has answers here: Mobile phone battery charger (3 answers) Closed 6 years ago. Here is the circuit of cellphone charger. I have seen the input voltage range for a cellphone charger to be 100-230 V but the output voltage to be fixed to the rated value(like ~4.5 V). So, my question is … Read more

Bike mobile charger

Hi, I’ve made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn’t charge any smart phones (with 1500mAh battery) with it. Even the charging indicator is not showing when I connect it to a smart phone. What … Read more