Wall-wart question (newbie followup)
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Posts: 46,084
I came across a Toshiba laptop power supply module (external) that
has the following markings:
Input 100V-240V~ 1.2A-0.6A 50-60Hz
Output 15V = (solid over dashed line) 5A
I'm assuming this is a DC supply (and will certainly check).
My question is: Is there anything special I should know about using
these in a basic stamp application? I would power the stamp circut
through a 7805, etc...
As mentioned in an earlier post, I'm looking to drive some DC motors
(via relays) as well as the basic stamp from as few power supplies as
possible. At 5amps, this certainly helps me toward that goal...
Seems too good to be true... What am I missing?
Thanks,
Rob
has the following markings:
Input 100V-240V~ 1.2A-0.6A 50-60Hz
Output 15V = (solid over dashed line) 5A
I'm assuming this is a DC supply (and will certainly check).
My question is: Is there anything special I should know about using
these in a basic stamp application? I would power the stamp circut
through a 7805, etc...
As mentioned in an earlier post, I'm looking to drive some DC motors
(via relays) as well as the basic stamp from as few power supplies as
possible. At 5amps, this certainly helps me toward that goal...
Seems too good to be true... What am I missing?
Thanks,
Rob
Comments
be positive, the 'ring' connector GND (I'm assuming
you have a 2.1/5.5 mm power plug on it, or that
you are going to put a 2.1/5.5 mm power plug on it.
What you're missing is that the power supply
probably cost $100.00 or so, which you don't have
to pay because you 'came across it'. It's probably
a 'switching mode' powersupply.
One more thing you might want to check: there may
be a 'minimum load' required to bring the output
voltage up to 15 volts. This wouldn't be a problem
for the Laptop, but your BS2 may not pull enough
current. You can test this with a few resistors,
though (50 mA at 5V == 1.6 mA at 15V, which is
900 ohms).
--- In basicstamps@yahoogroups.com, "rrothe64" <rrothe@m...> wrote:
> I came across a Toshiba laptop power supply module (external) that
> has the following markings:
>
> Input 100V-240V~ 1.2A-0.6A 50-60Hz
> Output 15V = (solid over dashed line) 5A
>
> I'm assuming this is a DC supply (and will certainly check).
>
> My question is: Is there anything special I should know about
using
> these in a basic stamp application? I would power the stamp circut
> through a 7805, etc...
>
> As mentioned in an earlier post, I'm looking to drive some DC
motors
> (via relays) as well as the basic stamp from as few power supplies
as
> possible. At 5amps, this certainly helps me toward that goal...
> Seems too good to be true... What am I missing?
>
> Thanks,
> Rob
there some significance to the solid line over the dotted line?
The unit is labeled "For use with EDP Equipment Only"... Other than
that, I see no other references.
Thanks for the help.
--- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
wrote:
> Sounds good! Note that the CENTER conductor MUST
> be positive, the 'ring' connector GND (I'm assuming
> you have a 2.1/5.5 mm power plug on it, or that
> you are going to put a 2.1/5.5 mm power plug on it.
>
> What you're missing is that the power supply
> probably cost $100.00 or so, which you don't have
> to pay because you 'came across it'. It's probably
> a 'switching mode' powersupply.
>
> One more thing you might want to check: there may
> be a 'minimum load' required to bring the output
> voltage up to 15 volts. This wouldn't be a problem
> for the Laptop, but your BS2 may not pull enough
> current. You can test this with a few resistors,
> though (50 mA at 5V == 1.6 mA at 15V, which is
> 900 ohms).
>
> --- In basicstamps@yahoogroups.com, "rrothe64" <rrothe@m...> wrote:
> > I came across a Toshiba laptop power supply module (external)
that
> > has the following markings:
> >
> > Input 100V-240V~ 1.2A-0.6A 50-60Hz
> > Output 15V = (solid over dashed line) 5A
> >
> > I'm assuming this is a DC supply (and will certainly check).
> >
> > My question is: Is there anything special I should know about
> using
> > these in a basic stamp application? I would power the stamp
circut
> > through a 7805, etc...
> >
> > As mentioned in an earlier post, I'm looking to drive some DC
> motors
> > (via relays) as well as the basic stamp from as few power
supplies
> as
> > possible. At 5amps, this certainly helps me toward that goal...
> > Seems too good to be true... What am I missing?
> >
> > Thanks,
> > Rob
Jonathan
www.madlabs.info
Original Message
From: "rrothe64" <rrothe@m...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, July 14, 2003 11:31 AM
Subject: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
> How can I find out if it is a 'switching' power supply or not? Is
> there some significance to the solid line over the dotted line?
>
> The unit is labeled "For use with EDP Equipment Only"... Other than
> that, I see no other references.
>
> Thanks for the help.
>
>
>
> --- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
> wrote:
> > Sounds good! Note that the CENTER conductor MUST
> > be positive, the 'ring' connector GND (I'm assuming
> > you have a 2.1/5.5 mm power plug on it, or that
> > you are going to put a 2.1/5.5 mm power plug on it.
> >
> > What you're missing is that the power supply
> > probably cost $100.00 or so, which you don't have
> > to pay because you 'came across it'. It's probably
> > a 'switching mode' powersupply.
> >
> > One more thing you might want to check: there may
> > be a 'minimum load' required to bring the output
> > voltage up to 15 volts. This wouldn't be a problem
> > for the Laptop, but your BS2 may not pull enough
> > current. You can test this with a few resistors,
> > though (50 mA at 5V == 1.6 mA at 15V, which is
> > 900 ohms).
> >
> > --- In basicstamps@yahoogroups.com, "rrothe64" <rrothe@m...> wrote:
> > > I came across a Toshiba laptop power supply module (external)
> that
> > > has the following markings:
> > >
> > > Input 100V-240V~ 1.2A-0.6A 50-60Hz
> > > Output 15V = (solid over dashed line) 5A
> > >
> > > I'm assuming this is a DC supply (and will certainly check).
> > >
> > > My question is: Is there anything special I should know about
> > using
> > > these in a basic stamp application? I would power the stamp
> circut
> > > through a 7805, etc...
> > >
> > > As mentioned in an earlier post, I'm looking to drive some DC
> > motors
> > > (via relays) as well as the basic stamp from as few power
> supplies
> > as
> > > possible. At 5amps, this certainly helps me toward that goal...
> > > Seems too good to be true... What am I missing?
> > >
> > > Thanks,
> > > Rob
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
10 volts across it.
Using a LM2575 with a proper layout will get you ~85% effiency with
up to 1A output.
Jason
--- In basicstamps@yahoogroups.com, "Jonathan Peakall"
<jpeakall@m...> wrote:
> Yes, it means DC. A wavy line indicates AC.
>
> Jonathan
>
> www.madlabs.info
>
>
>
Original Message
> From: "rrothe64" <rrothe@m...>
> To: <basicstamps@yahoogroups.com>
> Sent: Monday, July 14, 2003 11:31 AM
> Subject: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
>
>
> > How can I find out if it is a 'switching' power supply or not? Is
> > there some significance to the solid line over the dotted line?
> >
> > The unit is labeled "For use with EDP Equipment Only"... Other
than
> > that, I see no other references.
> >
> > Thanks for the help.
> >
> >
> >
> > --- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
> > wrote:
> > > Sounds good! Note that the CENTER conductor MUST
> > > be positive, the 'ring' connector GND (I'm assuming
> > > you have a 2.1/5.5 mm power plug on it, or that
> > > you are going to put a 2.1/5.5 mm power plug on it.
> > >
> > > What you're missing is that the power supply
> > > probably cost $100.00 or so, which you don't have
> > > to pay because you 'came across it'. It's probably
> > > a 'switching mode' powersupply.
> > >
> > > One more thing you might want to check: there may
> > > be a 'minimum load' required to bring the output
> > > voltage up to 15 volts. This wouldn't be a problem
> > > for the Laptop, but your BS2 may not pull enough
> > > current. You can test this with a few resistors,
> > > though (50 mA at 5V == 1.6 mA at 15V, which is
> > > 900 ohms).
> > >
> > > --- In basicstamps@yahoogroups.com, "rrothe64" <rrothe@m...>
wrote:
> > > > I came across a Toshiba laptop power supply module (external)
> > that
> > > > has the following markings:
> > > >
> > > > Input 100V-240V~ 1.2A-0.6A 50-60Hz
> > > > Output 15V = (solid over dashed line) 5A
> > > >
> > > > I'm assuming this is a DC supply (and will certainly check).
> > > >
> > > > My question is: Is there anything special I should know about
> > > using
> > > > these in a basic stamp application? I would power the stamp
> > circut
> > > > through a 7805, etc...
> > > >
> > > > As mentioned in an earlier post, I'm looking to drive some DC
> > > motors
> > > > (via relays) as well as the basic stamp from as few power
> > supplies
> > > as
> > > > possible. At 5amps, this certainly helps me toward that
goal...
> > > > Seems too good to be true... What am I missing?
> > > >
> > > > Thanks,
> > > > Rob
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
The dotted line signifies that the output is not perfectly flat DC.
Regards
Eco
Original Message
From: "rrothe64" <rrothe@m...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, July 14, 2003 8:31 PM
Subject: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
> How can I find out if it is a 'switching' power supply or not? Is
> there some significance to the solid line over the dotted line?
>
> The unit is labeled "For use with EDP Equipment Only"... Other than
> that, I see no other references.
>
> Thanks for the help.
>
>
>
> --- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
> wrote:
> > Sounds good! Note that the CENTER conductor MUST
> > be positive, the 'ring' connector GND (I'm assuming
> > you have a 2.1/5.5 mm power plug on it, or that
> > you are going to put a 2.1/5.5 mm power plug on it.
> >
> > What you're missing is that the power supply
> > probably cost $100.00 or so, which you don't have
> > to pay because you 'came across it'. It's probably
> > a 'switching mode' powersupply.
> >
> > One more thing you might want to check: there may
> > be a 'minimum load' required to bring the output
> > voltage up to 15 volts. This wouldn't be a problem
> > for the Laptop, but your BS2 may not pull enough
> > current. You can test this with a few resistors,
> > though (50 mA at 5V == 1.6 mA at 15V, which is
> > 900 ohms).
> >
> > --- In basicstamps@yahoogroups.com, "rrothe64" <rrothe@m...> wrote:
> > > I came across a Toshiba laptop power supply module (external)
> that
> > > has the following markings:
> > >
> > > Input 100V-240V~ 1.2A-0.6A 50-60Hz
> > > Output 15V = (solid over dashed line) 5A
> > >
> > > I'm assuming this is a DC supply (and will certainly check).
> > >
> > > My question is: Is there anything special I should know about
> > using
> > > these in a basic stamp application? I would power the stamp
> circut
> > > through a 7805, etc...
> > >
> > > As mentioned in an earlier post, I'm looking to drive some DC
> > motors
> > > (via relays) as well as the basic stamp from as few power
> supplies
> > as
> > > possible. At 5amps, this certainly helps me toward that goal...
> > > Seems too good to be true... What am I missing?
> > >
> > > Thanks,
> > > Rob
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
components. Usually quite big and very heavy.
Switching supplies only have a small coil and a fair number of other small
components. Smaller (2/3 to 1/2) and far lighter.
Original Message
From: "rrothe64" <rrothe@m...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, July 14, 2003 11:31 AM
Subject: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
> How can I find out if it is a 'switching' power supply or not? Is
> there some significance to the solid line over the dotted line?
>
> The unit is labeled "For use with EDP Equipment Only"... Other than
> that, I see no other references.
>
> Thanks for the help.
provide steady power? I recall reading about the load requirements
when I was researching the use of old PC power supplies. Do I need
to be concerned with this when using this toshiba supply or am I
confusing two issues? (btw, the model # is PA3083U-1ACA).
Rob
--- In basicstamps@yahoogroups.com, pm <pmeloy@s...> wrote:
> Regular power supplies use a honkin' big transformer and very few
other
> components. Usually quite big and very heavy.
>
> Switching supplies only have a small coil and a fair number of
other small
> components. Smaller (2/3 to 1/2) and far lighter.
>
>
Original Message
> From: "rrothe64" <rrothe@m...>
> To: <basicstamps@yahoogroups.com>
> Sent: Monday, July 14, 2003 11:31 AM
> Subject: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
>
>
> > How can I find out if it is a 'switching' power supply or not? Is
> > there some significance to the solid line over the dotted line?
> >
> > The unit is labeled "For use with EDP Equipment Only"... Other
than
> > that, I see no other references.
> >
> > Thanks for the help.
You have a switching supply. Your earlier thread
mentioned 100 to 240 VAC input, which indicates a
"universal" input. For a transformer power supply, one
must select the appropriate input voltage with a
switch to select the correct transformer windings.
Rule of thumb about switching power supplies requiring
a load to start:
Switching supplies greater than 100 watts typically
require a load. This prevents excess voltage appearing
across the output capacitors and ensures regulation.
Switching power supplies less than 100 watts generally
work fine with no load. More specifically, the
internal regulation circuit and capactor "bleader"
resistor is an adequate load to prevent problems and
stays within regulation. Since your supply is about 75
watts (15VCD * 5ADC), you can simply plug it in and
power anything requiring 15 volts that does not exceed
5 amps. The output will be a tightly regulated and
filtered DC.
Lastly, the solid line over the dotted line simply
means DC. It's an old-school way of indicating what
the output would look like on a scope.
Regards,
Dr. Diode
--- rrothe64 <rrothe@m...> wrote:
> Do all switching power supplies require some type of
> load before they
> provide steady power? I recall reading about the
> load requirements
> when I was researching the use of old PC power
> supplies. Do I need
> to be concerned with this when using this toshiba
> supply or am I
> confusing two issues? (btw, the model # is
> PA3083U-1ACA).
>
> Rob
>
>
> --- In basicstamps@yahoogroups.com, pm <pmeloy@s...>
> wrote:
> > Regular power supplies use a honkin' big
> transformer and very few
> other
> > components. Usually quite big and very heavy.
> >
> > Switching supplies only have a small coil and a
> fair number of
> other small
> > components. Smaller (2/3 to 1/2) and far lighter.
> >
> >
Original Message
> > From: "rrothe64" <rrothe@m...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Monday, July 14, 2003 11:31 AM
> > Subject: [noparse][[/noparse]basicstamps] Re: Wall-wart question
> (newbie followup)
> >
> >
> > > How can I find out if it is a 'switching' power
> supply or not? Is
> > > there some significance to the solid line over
> the dotted line?
> > >
> > > The unit is labeled "For use with EDP Equipment
> Only"... Other
> than
> > > that, I see no other references.
> > >
> > > Thanks for the help.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject and Body of the message will be
> ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
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> Hello,
>
> You have a switching supply. Your earlier thread
> mentioned 100 to 240 VAC input, which indicates a
> "universal" input.
The poster had mentioned that the supply had a graphic depiction
of a solid line over a dashed line. I may be wrong but I don't
believe that it was specifically addressed as to whether the
dashed line on the supply meant "switching supply" or not. Can
someone in the know please address this? I'd love some
clarification on this issue.
Thanks,
Michael Burr
mburr@b... writes:
> The poster had mentioned that the supply had a graphic depiction
> of a solid line over a dashed line. I may be wrong but I don't
> believe that it was specifically addressed as to whether the
> dashed line on the supply meant "switching supply" or not. Can
> someone in the know please address this? I'd love some
> clarification on this issue.
>
> Thanks,
>
> Michael Burr
>
As far as I know, the dashed line ONLY inidcates DC (direct current).
[noparse][[/noparse]Non-text portions of this message have been removed]
incorrect information may have been passed on. Wall warts come in 2 DC
versions, regulated and unregulated. Unregulated have 2 lines one solid
and 1 dashed under it. Regulated have a solid line and the output voltage
is stable. You will not read 16VDC on a 12VDC Wall Wart with no load if you
do --- it is unregulated. On a regulated one you will read 12VDC or pretty
close to the 12 VDC load or no load. Of course the regulated cost more..
This can be seen in the Jameco catalog which lists all Wall Warts and notes
which ones are regulated verses non regulated.
Just wanted to add my 1 cents worth.
Eric
Original Message
From: "Michael Burr" <mburr@b...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, July 20, 2003 10:24 PM
Subject: Re: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
> PH wrote:
> > Hello,
> >
> > You have a switching supply. Your earlier thread
> > mentioned 100 to 240 VAC input, which indicates a
> > "universal" input.
>
> The poster had mentioned that the supply had a graphic depiction
> of a solid line over a dashed line. I may be wrong but I don't
> believe that it was specifically addressed as to whether the
> dashed line on the supply meant "switching supply" or not. Can
> someone in the know please address this? I'd love some
> clarification on this issue.
>
> Thanks,
>
> Michael Burr
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
Either way, I was running them through either a 7805 or a 7812. In
fact, I have a small breadboard that has both regulators on it
providing me a source for both +5 and +12 to power the stamp and
associated 12v relay coils.... works well for my purposes.
Rob
--- In basicstamps@yahoogroups.com, "Eric Adams" <hugs102@b...> wrote:
> I have been following this thread about wall warts and it appears
that some
> incorrect information may have been passed on. Wall warts come in
2 DC
> versions, regulated and unregulated. Unregulated have 2 lines one
solid
> and 1 dashed under it. Regulated have a solid line and the output
voltage
> is stable. You will not read 16VDC on a 12VDC Wall Wart with no
load if you
> do --- it is unregulated. On a regulated one you will read 12VDC or
pretty
> close to the 12 VDC load or no load. Of course the regulated cost
more..
> This can be seen in the Jameco catalog which lists all Wall Warts
and notes
> which ones are regulated verses non regulated.
>
> Just wanted to add my 1 cents worth.
>
> Eric
>
>
>
Original Message
> From: "Michael Burr" <mburr@b...>
> To: <basicstamps@yahoogroups.com>
> Sent: Sunday, July 20, 2003 10:24 PM
> Subject: Re: [noparse][[/noparse]basicstamps] Re: Wall-wart question (newbie followup)
>
>
> > PH wrote:
> > > Hello,
> > >
> > > You have a switching supply. Your earlier thread
> > > mentioned 100 to 240 VAC input, which indicates a
> > > "universal" input.
> >
> > The poster had mentioned that the supply had a graphic depiction
> > of a solid line over a dashed line. I may be wrong but I don't
> > believe that it was specifically addressed as to whether the
> > dashed line on the supply meant "switching supply" or not. Can
> > someone in the know please address this? I'd love some
> > clarification on this issue.
> >
> > Thanks,
> >
> > Michael Burr
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
A switching power supply is ALWAYS regulated. The very
term switching implies Pulse Width Modulation (PWM).
There are a few exceptions (car audio DC-to-DC, HV
supplies, etc.), but not with external laptop power
supplies or PC supplies. These must be tightly
regulated.
Transformer (non-switching) based "WallWarts" come in
many flavors including AC output, pulsating DC output
(non-filtered), DC output, and regulated DC output.
Regardless, if there is a solid line over a dashed
line, it is DC. Not necessarily regulated (I never
stated that it meant regulated), but simply DC.
Bottom line is this: 1st) If it says 100 to 240VAC In
and does not have an input voltage selector switch, it
is a switching power supply (universal input). 2nd)
Whatever the DC output voltage says, measure it with a
DVM. If it is within 2%, it is regulated; if not, it
is unregulated. Very simple to determine.
Dr. Diode
--- rrothe64 <rrothe@m...> wrote:
> Thanks for the info... I wondered what the "dots"
> meant...
>
> Either way, I was running them through either a 7805
> or a 7812. In
> fact, I have a small breadboard that has both
> regulators on it
> providing me a source for both +5 and +12 to power
> the stamp and
> associated 12v relay coils.... works well for my
> purposes.
>
> Rob
>
>
> --- In basicstamps@yahoogroups.com, "Eric Adams"
> <hugs102@b...> wrote:
> > I have been following this thread about wall warts
> and it appears
> that some
> > incorrect information may have been passed on.
> Wall warts come in
> 2 DC
> > versions, regulated and unregulated. Unregulated
> have 2 lines one
> solid
> > and 1 dashed under it. Regulated have a solid
> line and the output
> voltage
> > is stable. You will not read 16VDC on a 12VDC
> Wall Wart with no
> load if you
> > do --- it is unregulated. On a regulated one you
> will read 12VDC or
> pretty
> > close to the 12 VDC load or no load. Of course
> the regulated cost
> more..
> > This can be seen in the Jameco catalog which lists
> all Wall Warts
> and notes
> > which ones are regulated verses non regulated.
> >
> > Just wanted to add my 1 cents worth.
> >
> > Eric
> >
> >
> >
Original Message
> > From: "Michael Burr" <mburr@b...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Sunday, July 20, 2003 10:24 PM
> > Subject: Re: [noparse][[/noparse]basicstamps] Re: Wall-wart question
> (newbie followup)
> >
> >
> > > PH wrote:
> > > > Hello,
> > > >
> > > > You have a switching supply. Your earlier
> thread
> > > > mentioned 100 to 240 VAC input, which
> indicates a
> > > > "universal" input.
> > >
> > > The poster had mentioned that the supply had a
> graphic depiction
> > > of a solid line over a dashed line. I may be
> wrong but I don't
> > > believe that it was specifically addressed as to
> whether the
> > > dashed line on the supply meant "switching
> supply" or not. Can
> > > someone in the know please address this? I'd
> love some
> > > clarification on this issue.
> > >
> > > Thanks,
> > >
> > > Michael Burr
> > >
> > >
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