How to build a basic power regulator circuit?

[SoundMate]

I'm pretty new to electronics and I want to learn some more by
building a basic power regulator so that I can power/charge a USB
enabled device (e.g my mobile phone) from a battery pack that I have
which puts out around 7V/1.6A. I've gathered that a regulator IC will
do most of the work but I've no idea about how to make up the rest of
the circuit. Can anyone point me to further reading on making a
customised power regulator?

 

[Tom Biasi]

I'm pretty new to electronics and I want to learn some more by
building a basic power regulator so that I can power/charge a USB
enabled device (e.g my mobile phone) from a battery pack that I have
which puts out around 7V/1.6A. I've gathered that a regulator IC will
do most of the work but I've no idea about how to make up the rest of
the circuit. Can anyone point me to further reading on making a
customised power regulator?

Why don't you first type this in google: "build a battery powered usb device
charger"
Tom

 

[Nobody]

I'm pretty new to electronics and I want to learn some more by building a
basic power regulator so that I can power/charge a USB enabled device (e.g
my mobile phone) from a battery pack that I have which puts out around
7V/1.6A. I've gathered that a regulator IC will do most of the work but
I've no idea about how to make up the rest of the circuit.

One issue with USB power is that USB devices are limited to 100mA unless
they request more (in which case, they may get up to 500mA), and to 500uA
when suspended (which occurs when the bus is idle for 3ms). Depending upon
the device, the supply may need to be able speak USB in order to get the
device to draw power. And getting something to speak USB isn't a
begginer's project.

OTOH, if you just need to supply 5V, it couldn't be simpler. The circuit
need be nothing more than a 3-terminal regulator, e.g. 7805.

[The 7805 needs 2V dropout, so your input would need to be at least 7V.
Use a low-dropout part (e.g. LM1117) if the battery voltage is likely
to dip below that.]

If either the input or output leads are long, it's worth adding a 10uF
capacitor on that side of the regulator.

 

[Nobody]

Why don't you first type this in google: "build a battery powered usb
device charger"

Most of the links on the first page refer to boost converters, which
aren't suitable if the battery voltage is greater than 5V.

 

[SoundMate]

Why don't you first type this in google: "build a battery powered usb device
charger"
Tom

I did, and this is a great way of doing it if - you're using the same
battery as in the examples sourced through google and/or you have a
clue what you're doing, which I clearly do not.

Thanks for the comments everyone, I'm getting a step closer now.

 

[SoundMate]

I'm pretty new to electronics and I want to learn some more by building a
basic power regulator so that I can power/charge a USB enabled device (e.g
my mobile phone) from a battery pack that I have which puts out around
7V/1.6A. I've gathered that a regulator IC will do most of the work but
I've no idea about how to make up the rest of the circuit.

One issue with USB power is that USB devices are limited to 100mA unless
they request more (in which case, they may get up to 500mA), and to 500uA
when suspended (which occurs when the bus is idle for 3ms). Depending upon
the device, the supply may need to be able speak USB in order to get the
device to draw power. And getting something to speak USB isn't a
begginer's project.

OTOH, if you just need to supply 5V, it couldn't be simpler. The circuit
need be nothing more than a 3-terminal regulator, e.g. 7805.

[The 7805 needs 2V dropout, so your input would need to be at least 7V.
Use a low-dropout part (e.g. LM1117) if the battery voltage is likely
to dip below that.]

If either the input or output leads are long, it's worth adding a 10uF
capacitor on that side of the regulator.

It seems that the wall charger for the phone outputs at 500mA so I
think a MC78M05CT is looking good unless I am mistaken. This is the
most readily available for me and it puts out at the ratings I need.
Thanks again for your advice.

 

[Tom Biasi]

Most of the links on the first page refer to boost converters, which
aren't suitable if the battery voltage is greater than 5V.

So look at some other pages.
Tom

 

[SoundMate]

So look at some other pages.
Tom

Do you always bring so much to the table?

 

[Tom Biasi]

Do you always bring so much to the table?

I suppose you just want someone to do your research for you.
If you had indicated what you have done so far and where you were having
trouble understanding maybe I could help.
You asked to be pointed to further reading and I did that.

Tom

 

[SoundMate]

I suppose you just want someone to do your research for you.
If you had indicated what you have done so far and where you were having
trouble understanding maybe I could help.
You asked to be pointed to further reading and I did that.

Tom

No you didn't, you were just being crude, and you still are. As the
poster prior to you illustrated, I had stated what I was looking for,
in that I did not know how to equate for the particular variable
(cell) I am using. I know that I need to learn more, I therefore don't
need someone like you to tell me this in mankinds most banal form.

 

[Tom Biasi]

No you didn't, you were just being crude, and you still are. As the
poster prior to you illustrated, I had stated what I was looking for,
in that I did not know how to equate for the particular variable
(cell) I am using. I know that I need to learn more, I therefore don't
need someone like you to tell me this in mankinds most banal form.

Sorry that you were offended. I had no intentions other than to point you to
some research..
Tom

 

[Rich Grise]

I'm pretty new to electronics and I want to learn some more by building a
basic power regulator so that I can power/charge a USB enabled device (e.g
my mobile phone) from a battery pack that I have which puts out around
7V/1.6A. I've gathered that a regulator IC will do most of the work but
I've no idea about how to make up the rest of the circuit. Can anyone
point me to further reading on making a customised power regulator?

You know, there's more to google than a portal into USENET.

Try the "search" side of google; search on, say, "power regulator circuit"
Try it with and without quotes.

Good Luck!
Rich