AC Adapter
 

I need to replace an AC adapter that went out. Original is 12V 225mA. I have several 12V 1000mA. Any problem using 1000mA rated unti with 225mA machine?

AC Adapter
 

"Guv Bob" wrote:
I need to replace an AC adapter that went out. Original is 12V 225mA.
I have several 12V 1000mA. Any problem using 1000mA rated unti with 225mA machine?

If it's unregulated it will have a higher output voltage.

Greg

AC Adapter
 

On Mon, 23 Jul 2012 09:05:41 -0700, "Guv Bob"
wrote:

I need to replace an AC adapter that went out.

What device is this adapter powering?

Original is 12V 225mA. I have several 12V 1000mA.
Any problem using 1000mA rated unti with 225mA machine?

12V AC or DC?

Assuming DC, no problem if your unspecified device does not require
regulated power. Some power supplies have internal regulators. This
is very common with 5.0VDC adapters. Not so common with 12VDC
adapters, but still possible. If your adapter looks and feels like
it's just a big transformer, with just a diode inside, the replacement
is fine. However, if it looks like a switching power supply or the
unspecified device lacks an internal regulator, you'll eventually have
a problem with an unregulated adapter.

If AC, there's no such thing as a regulated AC wall wart so there
should be no problem substituting a high power adapter.

If DC, also, check the polarity on the DC power connector. Panasonic
phone devices and computah powered speakers sometimes use positive
grounds.

If DC, I usually don't have many failures with transformer operated AC
adapters. If they get hot, they may blow a thermal fuse, but that
takes real effort. However, switching regulators are another story.
For example:
http://802.11junk.com/jeffl/pics/repair/slides/Motorola-2210-02-PS.html
http://802.11junk.com/jeffl/pics/repair/slides/2Wire-power-supply.html
They're smaller, lighter, more efficient, cheaper, and turn off
without a load, but fail far more easily and more often.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

AC Adapter
 

On 7/23/2012 9:05 AM, Guv Bob wrote:
I need to replace an AC adapter that went out. Original is 12V 225mA. I have several 12V 1000mA. Any problem using 1000mA rated unti with 225mA machine?

Based on your question, the short answer is NO!

The longer answer is....
What is a machine?
sewing machine?
machine gun?
gumball machine?
Pinball machine?


Replacing an AC adapter with ANY DIFFERENT AC adapter
often works...except when it doesn't.
There are many subtle differences that CAN matter.

The fact that you asked the question suggests that you
don't understand those subtle differences.

Cheap devices are carefully designed to balance the
output of the supplied adapter against the needs of the device.
Are batteries being charged?

More expensive devices are often more robust, but I once
had a $2000 Compaq laptop computer that used the current
limit in the ac adapter to set the battery charge current.
BAD DESIGN, but there it was. Using a different adapter
was a disaster...ask me how I know.

Nobody can help you decide without more information.
Any advice you get based on your supplied info was made
by someone guessing.

AC Adapter
 

gregz wrote in

rg:

"Guv Bob" wrote:
I need to replace an AC adapter that went out. Original is 12V
225mA. I have several 12V 1000mA. Any problem using 1000mA rated
unti with 225mA machine?

If it's unregulated it will have a higher output voltage.

Greg


and watch the plug polarity.
some wallwarts use a positive ground DC plug,others use the usual negative
ground.

--
Jim Yanik
jyanik
at
localnet
dot com

AC Adapter
 

Another question.... I have a radio that shows a 9VDC input. Would an adapter with 12VDC output work?

AC Adapter
 

On Aug 7, 1:37*pm, "Guv Bob"
wrote:
Another question.... I have a radio that shows a 9VDC input. * Would an adapter with 12VDC output work?

I have a radio that shows a 6-12 VDC input. I would use your 12VDC
adapter with that.

AC Adapter
 

On 07/08/2012 21:37, Guv Bob wrote:
Another question.... I have a radio that shows a 9VDC input. Would
an adapter with 12VDC output work?


Too high a supply voltage (Volts, V), smoke from the apppliance.
Too high a demand for current (Amps, A), smoke from a puny adaptor.

Find a 9V DC adaptor that will supply at least the rated current the
appliance requires. Given that this may vary dependant on the volume the
radio is played at, and you don't know the radio's design limits for
max/min input voltage - best choose a adaptor that has a built in
voltage regulator (as suggested by gregz). Normally this is stated on
the case.

--
Adrian C

AC Adapter
 

Guv Bob wrote:

Another question.... I have a radio that shows a 9VDC input. Would an adapter with 12VDC output work?


Not likely. It will damage the radio if it doesn't have an internal
regulator, which is rare as hen's teeth.

AC Adapter
 

"Adrian C" wrote in message ...
On 07/08/2012 21:37, Guv Bob wrote:
Another question.... I have a radio that shows a 9VDC input. Would
an adapter with 12VDC output work?


Too high a supply voltage (Volts, V), smoke from the apppliance.
Too high a demand for current (Amps, A), smoke from a puny adaptor.

Find a 9V DC adaptor that will supply at least the rated current the
appliance requires. Given that this may vary dependant on the volume the
radio is played at, and you don't know the radio's design limits for
max/min input voltage - best choose a adaptor that has a built in
voltage regulator (as suggested by gregz). Normally this is stated on
the case.

--
Adrian C

The problem is it's a telephone/ans machine I brought back from Japan and all the printing is in Japanese. Original adapter was lost. No voltage/current numbers printed on the case anywhere - only says "DC" next to the plug. Searching the Pioneer website and elsewhere I could not find any data or info online looking up all the model, serial, etc numbers. Markings: TF-V21, A99-1185JP and their phone numbers 042-949-5131 and 06-6533-0099.

AC Adapter
 

On Aug 7, 4:42*pm, "Guv Bob"
wrote:
"Adrian C" wrote in ...
On 07/08/2012 21:37, Guv Bob wrote:
Another question.... I have a radio that shows a 9VDC input. * Would
an adapter with 12VDC output work?

Too high a supply voltage (Volts, V), smoke from the apppliance.
Too high a demand for current (Amps, A), smoke from a puny adaptor.

Find a 9V DC adaptor that will supply at least the rated current the
appliance requires. Given that this may vary dependant on the volume the
radio is played at, and you don't know the radio's design limits for
max/min input voltage - best choose a adaptor that has a built in
voltage regulator (as suggested by gregz). Normally this is stated on
the case.

--
Adrian C

The problem is it's a telephone/ans machine I brought back from Japan and all the printing is in Japanese. *Original adapter was lost. * No voltage/current numbers printed on the case anywhere - only says "DC" next to the plug. *Searching the Pioneer website and elsewhere I could not find any data or info online looking up all the model, serial, etc numbers. * Markings: *TF-V21, A99-1185JP and their phone numbers 042-949-5131 and 06-6533-0099.

The TF-V21, although apparently obsolete, is listed on the Pioneer web
site as a device that will operate in case the power goes out.
Therefore, it will operate from one or more batteries. I would open
the case and see what sort of batteries it uses.

http://pioneer-pcc.jp/support/faqList.html

It's amazing what can be learned given google search and google
translate.

AC Adapter
 

Michael A. Terrell laid this down on his screen :
Guv Bob wrote:

Another question.... I have a radio that shows a 9VDC input. Would an
adapter with 12VDC output work?


Not likely. It will damage the radio if it doesn't have an internal
regulator, which is rare as hen's teeth.

I don't know about the USA but the rest of the world has largly moved
to regulated SMPS for small device wall warts. And they generally even
suport the USA voltage too (Wot is it 120 volts) ;-)

--
John G

AC Adapter
 

I don't know about the USA but the rest of the world
has largly moved to regulated SMPS for small device
wall warts. And they generally even suport the USA
voltage too (Wot is it 120 volts) ;-)

Conventional external power supplies using bulky 50/60 Hz line transformers
have largely disappeared, as the parts used in switching supplies have
become less-expensive.

Most products come with tiny high-frequency supplies that are not only
regulated (regulation is a native feature of switching supplies), but will
work on any line from 90V to 250V. This allows the manufacturer to have a
single inventory. The same supply is shipped to every country, with only a
simple plug adapter (where needed).

AC Adapter
 

John G wrote:

Michael A. Terrell laid this down on his screen :
Guv Bob wrote:

Another question.... I have a radio that shows a 9VDC input. Would an
adapter with 12VDC output work?


Not likely. It will damage the radio if it doesn't have an internal
regulator, which is rare as hen's teeth.

I don't know about the USA but the rest of the world has largly moved
to regulated SMPS for small device wall warts. And they generally even
suport the USA voltage too (Wot is it 120 volts) ;-)


Most newer warts are SMPS, but if its one that's salvaged from older
equipment that's not likely. I have over 300 used warts, and only a few
are SMPS. I have about 100 laptop/printer 'desktop' supplies that are.

AC Adapter
 

On Tuesday, August 7, 2012 1:37:53 PM UTC-7, Guv Bob wrote:
Another question.... I have a radio that shows a 9VDC input. Would an adapter with 12VDC output work?

I wouldn't as a 12V unregulated wart is often 15-18 Volts unloaded.

AC Adapter
 

On Wednesday, August 8, 2012 2:29:52 AM UTC-7, William Sommerwerck wrote:
I don't know about the USA but the rest of the world has largly moved to regulated SMPS for small device wall warts. And they generally even suport the USA voltage too (Wot is it 120 volts) ;-) Conventional external power supplies using bulky 50/60 Hz line transformers have largely disappeared, as the parts used in switching supplies have become less-expensive. Most products come with tiny high-frequency supplies that are not only regulated (regulation is a native feature of switching supplies), but will work on any line from 90V to 250V. This allows the manufacturer to have a single inventory. The same supply is shipped to every country, with only a simple plug adapter (where needed).

FWIW, I have found that many 'compliant' SMPS 'wall warts' cause severe radio interference on the BC band and SW bands, but much less so on the FM band. Conducted and radiated emission standards for these units are generally fine unless they are connected directly to a receiver [where the PSU is effectively in series with "Ground" ].

Neil S.

AC Adapter
 

nesesu wrote:
On Wednesday, August 8, 2012 2:29:52 AM UTC-7, William Sommerwerck wrote:
I don't know about the USA but the rest of the world has largly moved
to regulated SMPS for small device wall warts. And they generally
even suport the USA voltage too (Wot is it 120 volts) ;-)
Conventional external power supplies using bulky 50/60 Hz line
transformers have largely disappeared, as the parts used in switching
supplies have become less-expensive. Most products come with tiny
high-frequency supplies that are not only regulated (regulation is a
native feature of switching supplies), but will work on any line from
90V to 250V. This allows the manufacturer to have a single inventory.
The same supply is shipped to every country, with only a simple plug
adapter (where needed).

FWIW, I have found that many 'compliant' SMPS 'wall warts' cause severe
radio interference on the BC band and SW bands, but much less so on the
FM band. Conducted and radiated emission standards for these units are
generally fine unless they are connected directly to a receiver [where
the PSU is effectively in series with "Ground" ].

Neil S.

To power a cb radio, I had to add 3 more ferrites plus extra turns through
them to get acceptable results. To get low capacitive 60 Hz feedthrough,
you need to ground one output leg. That was necessary when using audio or
medical devices.

Greg

AC Adapter
 

"spamtrap1888" wrote in message ...
On Aug 7, 4:42 pm, "Guv Bob"
wrote:
"Adrian C" wrote in ...
On 07/08/2012 21:37, Guv Bob wrote:
Another question.... I have a radio that shows a 9VDC input. Would
an adapter with 12VDC output work?

Too high a supply voltage (Volts, V), smoke from the apppliance.
Too high a demand for current (Amps, A), smoke from a puny adaptor.

Find a 9V DC adaptor that will supply at least the rated current the
appliance requires. Given that this may vary dependant on the volume the
radio is played at, and you don't know the radio's design limits for
max/min input voltage - best choose a adaptor that has a built in
voltage regulator (as suggested by gregz). Normally this is stated on
the case.

--
Adrian C

The problem is it's a telephone/ans machine I brought back from Japan and all the printing is in Japanese. Original adapter was lost. No voltage/current numbers printed on the case anywhere - only says "DC" next to the plug. Searching the Pioneer website and elsewhere I could not find any data or info online looking up all the model, serial, etc numbers. Markings: TF-V21, A99-1185JP and their phone numbers 042-949-5131 and 06-6533-0099.

The TF-V21, although apparently obsolete, is listed on the Pioneer web
site as a device that will operate in case the power goes out.
Therefore, it will operate from one or more batteries. I would open
the case and see what sort of batteries it uses.

http://pioneer-pcc.jp/support/faqList.html

It's amazing what can be learned given google search and google
translate.

Thanks for that! I it has been used for months now with no AC. Will check it out and post what I find out.