Finding the correct power adapter for a no-name brand music

D

David Farber

Guest
The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-content%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it.

My question is, how can I figure out what voltage and current rating the
power adapter needs to be in order to power the light and charge the battery
efficiently? If I put 4.0V on the input jack without the battery installed,
the lamps seem to light up fine. If you look closely inside the battery
wrapper, you can see an attached pc board. The wiring from the DC jack goes
to a series diode, then a transistor, then to the red wire extending out of
the neck of the lamp where the LED's are attached. There is also a blob of
round black stuff on the main pc board that looks like it could be covering
a uP.

Thanks for your replies.
--
David Farber
Los Osos, CA
 
On Thursday, January 12, 2017 at 1:23:44 PM UTC-8, David Farber wrote:
The stand light looks like...
The only information on the battery is 3.7 volts and it looks like...
Click to expand...

OK, that's a Li-ion rechargeable cell.
My question is, how can I figure out what voltage and current rating the
power adapter needs to be in order to power the light and charge the battery
efficiently?
Click to expand...

It's not so much 'efficiency', but safety that you should be concerned with;
presumably there's voltage and current charging limitations (I'd guess
0.1 to 1 ampere of charging current), plus whatever your LEDs
require (could be up to one half ampere). The
voltage must not get more than 4.3V, typically, on such a battery (but
that could be regulated in the power adapter, OR inside the lamp circuitry).

The circuitry and envelope around the battery are intended to prevent fire.

The prudent course is to find another identical unit, and get an exact match
to its wall tumor charger. Otherwise, you need to reverse-engineer the
charging scheme of a poorly documented battery that has the potential
to burst into flame if mistreated.

This kind of problem is why cellphone chargers are USB micro-B with 5V output:
no one could get the right charger when they needed it, and nations passed laws...
 
whit3rd wrote:
On Thursday, January 12, 2017 at 1:23:44 PM UTC-8, David Farber wrote:
The stand light looks like...
The only information on the battery is 3.7 volts and it looks like...

OK, that's a Li-ion rechargeable cell.

My question is, how can I figure out what voltage and current rating
the power adapter needs to be in order to power the light and charge
the battery efficiently?

It's not so much 'efficiency', but safety that you should be
concerned with; presumably there's voltage and current charging
limitations (I'd guess
0.1 to 1 ampere of charging current), plus whatever your LEDs
require (could be up to one half ampere). The
voltage must not get more than 4.3V, typically, on such a battery (but
that could be regulated in the power adapter, OR inside the lamp
circuitry).

The circuitry and envelope around the battery are intended to prevent
fire.

The prudent course is to find another identical unit, and get an
exact match
to its wall tumor charger. Otherwise, you need to reverse-engineer
the
charging scheme of a poorly documented battery that has the potential
to burst into flame if mistreated.

This kind of problem is why cellphone chargers are USB micro-B with
5V output:
no one could get the right charger when they needed it, and nations
passed laws...
Click to expand...

Thank you for the detailed explanation. I will try and get some information
about the chargers that come with similar stand lights containing Li-ion
batteries.

--
David Farber
Los Osos, CA
 
Am 12.01.2017 um 22:24 schrieb David Farber:
The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-content%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it.

My question is, how can I figure out what voltage and current rating the
power adapter needs to be in order to power the light and charge the battery
efficiently? If I put 4.0V on the input jack without the battery installed,
the lamps seem to light up fine. If you look closely inside the battery
wrapper, you can see an attached pc board. The wiring from the DC jack goes
to a series diode, then a transistor, then to the red wire extending out of
the neck of the lamp where the LED's are attached. There is also a blob of
round black stuff on the main pc board that looks like it could be covering
a uP.

Thanks for your replies.
Click to expand...

can you show us the power-connector of the lamp?

peter
 
The battery cell is a rechargeable one.

This explains the diode and transistor.

So a standard 5V 3A power supply is enough.

But according to what you say, the battery is empty ; needs a 24-hour
recharge.

David Farber a écrit :
The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-content%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it.

My question is, how can I figure out what voltage and current rating the
power adapter needs to be in order to power the light and charge the battery
efficiently? If I put 4.0V on the input jack without the battery installed,
the lamps seem to light up fine. If you look closely inside the battery
wrapper, you can see an attached pc board. The wiring from the DC jack goes
to a series diode, then a transistor, then to the red wire extending out of
the neck of the lamp where the LED's are attached. There is also a blob of
round black stuff on the main pc board that looks like it could be covering
a uP.

Thanks for your replies.
Click to expand...
 
Peter Gierschner wrote:
Am 12.01.2017 um 22:24 schrieb David Farber:
The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like
this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-content%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it. My
question is, how can I figure out what voltage and current rating
the power adapter needs to be in order to power the light and charge
the battery efficiently? If I put 4.0V on the input jack without the
battery installed, the lamps seem to light up fine. If you look
closely inside the battery wrapper, you can see an attached pc
board. The wiring from the DC jack goes to a series diode, then a
transistor, then to the red wire extending out of the neck of the
lamp where the LED's are attached. There is also a blob of round
black stuff on the main pc board that looks like it could be
covering a uP. Thanks for your replies.


can you show us the power-connector of the lamp?

peter
Click to expand...

Peter Gierschner wrote:
Am 12.01.2017 um 22:24 schrieb David Farber:
The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like
this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-content%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it. My
question is, how can I figure out what voltage and current rating
the power adapter needs to be in order to power the light and charge
the battery efficiently? If I put 4.0V on the input jack without the
battery installed, the lamps seem to light up fine. If you look
closely inside the battery wrapper, you can see an attached pc
board. The wiring from the DC jack goes to a series diode, then a
transistor, then to the red wire extending out of the neck of the
lamp where the LED's are attached. There is also a blob of round
black stuff on the main pc board that looks like it could be
covering a uP. Thanks for your replies.


can you show us the power-connector of the lamp?

peter
Click to expand...

Here is the connector:
http://webpages.charter.net/mrfixiter/images/Electronics/Music_light/DC-plug.jpg

I have a 5V 1.5A power supply from an old Epson Zip drive but the connector
is too big. The connector on the lamp seems to be on the smaller end of the
spectrum.

Here is the pc board:
http://webpages.charter.net/mrfixiter/images/Electronics/Music_light/PC-board-lamp.jpg

Thanks for your reply.
--
David Farber
Los Osos, CA
 
In article <o58s1u$q6b$1@dont-email.me>,
"David Farber" <farberbear.unspam@aol.com> wrote:

The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%
2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-conte
nt%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it.

My question is, how can I figure out what voltage and current rating the
power adapter needs to be in order to power the light and charge the battery
efficiently? If I put 4.0V on the input jack without the battery installed,
the lamps seem to light up fine. If you look closely inside the battery
wrapper, you can see an attached pc board. The wiring from the DC jack goes
to a series diode, then a transistor, then to the red wire extending out of
the neck of the lamp where the LED's are attached. There is also a blob of
round black stuff on the main pc board that looks like it could be covering
a uP.
Click to expand...

David-

I recently purchased a similar stand light, so your article caught my
eye. Mine is more like the 10 LED version with replaceable batteries.

Searching Amazon, I found at least four 9-LED lights that are close to
what you have. I think they all can be powered (or charged) from either
an AC adapter or a from a USB outlet.

The four are:
Kootek
Sipik
Ohuhu
Lumiens L9B.

It is possible that two or more of these are actually the same light
imported by different companies. Is there anything about yours that
might suggest one of these names?

Fred
 
Fred McKenzie wrote:
In article <o58s1u$q6b$1@dont-email.me>,
"David Farber" <farberbear.unspam@aol.com> wrote:

The stand light looks like this:
https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fwww.long-mcquade.com%2Ffiles%
2F19166%2Flg_light-2.jpg&f=1
but the light I have has only 9 LED's.

The only information on the battery is 3.7 volts and it looks like
this:
https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.pi-supply.com%2Fwp-conte
nt%2Fuploads%2F2014%2F12%2F2011-03.jpg&f=1
however my battery does not have any amp-hr rating written on it.

My question is, how can I figure out what voltage and current rating
the power adapter needs to be in order to power the light and charge
the battery efficiently? If I put 4.0V on the input jack without the
battery installed, the lamps seem to light up fine. If you look
closely inside the battery wrapper, you can see an attached pc
board. The wiring from the DC jack goes to a series diode, then a
transistor, then to the red wire extending out of the neck of the
lamp where the LED's are attached. There is also a blob of round
black stuff on the main pc board that looks like it could be
covering a uP.

David-

I recently purchased a similar stand light, so your article caught my
eye. Mine is more like the 10 LED version with replaceable batteries.

Searching Amazon, I found at least four 9-LED lights that are close to
what you have. I think they all can be powered (or charged) from
either an AC adapter or a from a USB outlet.

The four are:
Kootek
Sipik
Ohuhu
Lumiens L9B.

It is possible that two or more of these are actually the same light
imported by different companies. Is there anything about yours that
might suggest one of these names?

Fred
Click to expand...

Hi Fred,

I personally have the 9 LED Mighty Bright that I purchased a couple of years
ago which uses 3 AA batteries. It also can be powered with an AC adapter
which is 4V 400ma.
There isn't any kind of identifying writing anywhere on this other light. I
haven't opened up the lamp compartment but I may do that just because I've
looked everywhere else.

Thanks for your reply.
--
David Farber
Los Osos, CA
 
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