How to build a basic power regulator circuit?

S

SoundMate

Guest
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?
 
"SoundMate" <buljarse@gmail.com> wrote in message
news:b300c042-1e0b-49f9-9372-69754deee9e8@v19g2000yqn.googlegroups.com...
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
Click to expand...
charger"
Tom
 
On Thu, 16 Apr 2009 09:27:32 -0700, SoundMate wrote:

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.
Click to expand...
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.
 
On Thu, 16 Apr 2009 13:16:50 -0400, Tom Biasi wrote:

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"
Click to expand...
Most of the links on the first page refer to boost converters, which
aren't suitable if the battery voltage is greater than 5V.
 
"Nobody" <nobody@nowhere.com> wrote in message
news:pan.2009.04.16.21.51.06.906000@nowhere.com...
On Thu, 16 Apr 2009 13:16:50 -0400, Tom Biasi wrote:

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"

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.
Click to expand...
Tom
 
On 16 Apr, 18:16, "Tom Biasi" <tombi...@optonline.net> wrote:
"SoundMate" <bulja...@gmail.com> wrote in message

news:b300c042-1e0b-49f9-9372-69754deee9e8@v19g2000yqn.googlegroups.com...> 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
Click to expand...
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.
 
On 16 Apr, 22:48, Nobody <nob...@nowhere.com> wrote:
On Thu, 16 Apr 2009 09:27:32 -0700, SoundMate wrote:
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.
Click to expand...
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.
 
On 17 Apr, 00:06, "Tom Biasi" <tombi...@optonline.net> wrote:
"Nobody" <nob...@nowhere.com> wrote in message

news:pan.2009.04.16.21.51.06.906000@nowhere.com...

On Thu, 16 Apr 2009 13:16:50 -0400, Tom Biasi wrote:

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"

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
Click to expand...
Do you always bring so much to the table?
 
"SoundMate" <buljarse@gmail.com> wrote in message
news:b2547d9c-01d6-44e3-b720-cfbd62b8324d@q16g2000yqg.googlegroups.com...
On 17 Apr, 00:06, "Tom Biasi" <tombi...@optonline.net> wrote:
"Nobody" <nob...@nowhere.com> wrote in message

news:pan.2009.04.16.21.51.06.906000@nowhere.com...

On Thu, 16 Apr 2009 13:16:50 -0400, Tom Biasi wrote:

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"

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

Do you always bring so much to the table?
I suppose you just want someone to do your research for you.
Click to expand...
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
 
On 17 Apr, 11:38, "Tom Biasi" <tombi...@optonline.net> wrote:
"SoundMate" <bulja...@gmail.com> wrote in message

news:b2547d9c-01d6-44e3-b720-cfbd62b8324d@q16g2000yqg.googlegroups.com...

On 17 Apr, 00:06, "Tom Biasi" <tombi...@optonline.net> wrote:
"Nobody" <nob...@nowhere.com> wrote in message

news:pan.2009.04.16.21.51.06.906000@nowhere.com...

On Thu, 16 Apr 2009 13:16:50 -0400, Tom Biasi wrote:

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"

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

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
Click to expand...
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.
 
"SoundMate" <buljarse@gmail.com> wrote in message
news:98061e8d-e709-4224-a66f-30dae5d090e3@k2g2000yql.googlegroups.com...
On 17 Apr, 11:38, "Tom Biasi" <tombi...@optonline.net> wrote:
"SoundMate" <bulja...@gmail.com> wrote in message

news:b2547d9c-01d6-44e3-b720-cfbd62b8324d@q16g2000yqg.googlegroups.com...

On 17 Apr, 00:06, "Tom Biasi" <tombi...@optonline.net> wrote:
"Nobody" <nob...@nowhere.com> wrote in message

news:pan.2009.04.16.21.51.06.906000@nowhere.com...

On Thu, 16 Apr 2009 13:16:50 -0400, Tom Biasi wrote:

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"

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

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

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
Click to expand...
some research..
Tom
 
On Thu, 16 Apr 2009 09:27:32 -0700, SoundMate wrote:

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?
Click to expand...
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
 
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