Isolation transformer source

[JW]

Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

 

[Traci Steele]

JW wrote:

Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

http://www.news-leader.com/article/20100610/NEWS01/6100368/Former-Kanakuk-Kamps-counselor-sentenced

A former camp counselor who pleaded guilty to sexually abusing several
children received two life sentences plus 30 years in prison on Wednesday.

Peter D. Newman, who worked at Kanakuk Kamps near Branson, was given the
sentence by Circuit Judge Mark Orr in Taney County after testimony from
a pair of psychologists, a Kanakuk staff member, a friend of Newman's,
two of his brothers and Newman himself.

Victims and their families did not testify at the hearing. They had
submitted written statements to Orr at an earlier time.

Newman had pleaded guilty in February to three counts of second-degree
statutory sodomy, two counts of first-degree statutory sodomy and two
counts of enticement of a child.

According to court records, Newman enticed children to join him for
"Bible studies" in a hot tub where they would engage in mutual masturbation.

At least one other victim said he and Newman performed oral and anal sex
on each other.

The victim also described Newman as his "spiritual mentor."

The abuse began when Newman first became a counselor in 1999 and
continued until 2009 when he was fired after camp administrators learned
of the allegations.

Newman's eight charges ultimately involved activity with six children.
However, Merrell said after the sentencing that Newman had admitted to
sexual activity with 13 other children as well. Many families chose not
to get involved.

"We won't try to force families to come forward," Merrell said.
"Particularly considering today's sentence."

Newman's attorney, Tom Carver, said he was disappointed in the outcome.

"I think it was a pretty severe sentence, given Pete's promising ability
to be amenable to treatment," he said.

A psychologist specializing in sex offender issues, Joseph Plaud, had
testified that Newman was a good candidate for treatment.

Another psychologist, Anna Salter, who testified for the state, said
that Newman could pose a danger because he had been able to abuse
children for a decade without being caught.

Newman also spoke to the judge and apologized for his actions.

"I was supposed to model Christ and I didn't," he said, fighting back
tears. "I made him look bad."

Taney County Prosecutor Jeff Merrell told Orr that Newman was "the most
prolific child molester" he's been aware of.

Taney County Sheriff Jimmie Russell said it was a difficult case to
investigate, both personally and logistically.

"It's hard on the investigators, the families and the victims," he said.

He said he was satisfied with the sentence and that it makes a strong
message to the community that Newman's behavior is not tolerated.

"What's upsetting is that he used religion to groom these kids for his
sexual gratification," he said. "That's very upsetting."

Merrell could not specify when Newman would be eligible for parole, but
he said it would be a long time.

Newman still could face charges in Colorado where he committed some of
his crimes at another Kanakuk camp.

 

[Dave Plowman (News)]

In article <4aq11618vo0cnvj8nbo18ltall6f560043@4ax.com>,
JW <none@dev.null> wrote:

Can anyone recommend a good isolation transformer for sale on-line? Need
one that will handle 5 amps or so at 120VAC, and have a standard AC plug
at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for
1.25A. Getting lots of irrelevant hits on google...

I'm in the UK so it's 240 volts, but found it a lot cheaper to buy the
transformer bare and box it up myself. They're not a mass produced device
like say a 240 - 110 type so that may be the reason.

They used to be common for stage etc use, but RCDs etc seem to have
replaced them. As well as safer electronic instrument design.

They might well come up on Ebay secondhand, though.

--
*When cheese gets its picture taken, what does it say? *

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Dave Plowman (News)]

In article <hur41d$6pu$3@reader1.panix.com>,
Cydrome Leader <presence@MUNGEpanix.com> wrote:

JW <none@dev.null> wrote:
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard
AC plug at the outlet. Prefer one for less than $100 or so, unless
that seems unreasonable. Found one at Mouser for $114 but that's only
good for 1.25A. Getting lots of irrelevant hits on google...

Thanks.

I think the $100 and "good quality" exclude each other for a transformer
that size.

A 625VA toroidal in the UK would cost about 50 gbp as a bare unit.
Slightly more for a one off.

--
*Never underestimate the power of stupid people in large groups.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[GregS]

In article <hur41d$6pu$3@reader1.panix.com>, Cydrome Leader <presence@MUNGEpanix.com> wrote:

JW <none@dev.null> wrote:
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

I think the $100 and "good quality" exclude each other for a transformer
that size.

the smaller units as used with cash registers and POS systems tend to max
out at 4 amps.

is used is ok, look for stuff from acme, topaz, oneac, shape, powervar.
powervar even had some interesting ones based off toroidal tranformers if
you want the ooh and aah factor.

Not cheap. Surplus Sales of Nebraska has some.

Depending on what your going to do, check if it has the secondary to ground bonding
which you should remove if you are seaking ground isolation.

greg

 

[Cydrome Leader]

JW <none@dev.null> wrote:

Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

I think the $100 and "good quality" exclude each other for a transformer
that size.

the smaller units as used with cash registers and POS systems tend to max
out at 4 amps.

is used is ok, look for stuff from acme, topaz, oneac, shape, powervar.
powervar even had some interesting ones based off toroidal tranformers if
you want the ooh and aah factor.

 

On Thu, 10 Jun 2010 09:44:12 -0400, JW <none@dev.null> wrote:

Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.
Here's one on eBay. 4.35A for about $75 delivered.

http://cgi.ebay.com/Stancor-GIS-500-Isolation-Transformer-115v-out-115v-/250643065589?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a5b7daaf5

PlainBill

 

[Cydrome Leader]

GregS <zekfrivo@zekfrivolous.com> wrote:

In article <hur41d$6pu$3@reader1.panix.com>, Cydrome Leader <presence@MUNGEpanix.com> wrote:
JW <none@dev.null> wrote:
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

I think the $100 and "good quality" exclude each other for a transformer
that size.

the smaller units as used with cash registers and POS systems tend to max
out at 4 amps.

is used is ok, look for stuff from acme, topaz, oneac, shape, powervar.
powervar even had some interesting ones based off toroidal tranformers if
you want the ooh and aah factor.

Not cheap. Surplus Sales of Nebraska has some.

I'd avoid surplus sales. Why pay twice new prices for old stuff when you
don't have to?

It's an interesting place browse, and I've been there in person, but the
ripoff factor is pretty incredible.

 

[Phil Allison]

"JW"

Can anyone recommend a good isolation transformer for sale on-line?

** What kind ??

There are two:

1. Galvanic isolation - for use on a service bench.

2. Neutral conductor isolation.

Most you see offered for sale in the USA are of the *second* kind.



..... Phil

 

[bob]

On 6/10/2010 4:57 PM, Cydrome Leader wrote:

GregS<zekfrivo@zekfrivolous.com> wrote:
In article<hur41d$6pu$3@reader1.panix.com>, Cydrome Leader<presence@MUNGEpanix.com> wrote:
JW<none@dev.null> wrote:
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

I think the $100 and "good quality" exclude each other for a transformer
that size.

the smaller units as used with cash registers and POS systems tend to max
out at 4 amps.

is used is ok, look for stuff from acme, topaz, oneac, shape, powervar.
powervar even had some interesting ones based off toroidal tranformers if
you want the ooh and aah factor.

Not cheap. Surplus Sales of Nebraska has some.

I'd avoid surplus sales. Why pay twice new prices for old stuff when you
don't have to?

It's an interesting place browse, and I've been there in person, but the
ripoff factor is pretty incredible.



Surplus sales has its place in the food chain. Its NOT a salvage place

that just haphazardly throws stuff in piles, its all gone through
sorted,labeled and cataloged. Lots of nice old ham gear stuff if you
into it. Yea, most of it is not cheap. but try to find some of it from
other sources. Some of the stuff they have will NEVER sell at the prices
they have it at. Everyone knows how hot tube oscilloscopes are.....

With the number of shops closing, i would wait for a going out of
business sale or Ebay.

bob

 

[Jon Danniken]

JW wrote:

Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard
AC plug at the outlet. Prefer one for less than $100 or so, unless
that seems unreasonable. Found one at Mouser for $114 but that's only
good for 1.25A. Getting lots of irrelevant hits on google...

Thanks.

You could always salvage a couple of microwave oven transformers and connect
them back to back. Make sure and disconnect the secondaries from the cores
though, of course.

Jon

 

[Phil Allison]

"Jon Danniken"

You could always salvage a couple of microwave oven transformers and
connect them back to back. Make sure and disconnect the secondaries from
the cores though, of course.

** Massively STUPID idea.

Absolutely WILL NOT WORK.



...... Phil

 

[Chuck]

On Thu, 10 Jun 2010 09:44:12 -0400, JW <none@dev.null> wrote:

Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

MCM Electronics has one. Chuck

 

[Dave Plowman (News)]

In article <87dee7Fdj9U1@mid.individual.net>,
Phil Allison <phil_a@tpg.com.au> wrote:

"JW"

Can anyone recommend a good isolation transformer for sale on-line?

** What kind ??

There are two:

1. Galvanic isolation - for use on a service bench.

2. Neutral conductor isolation.

Most you see offered for sale in the USA are of the *second* kind.

.... Phil

Surely an isolation transformer is just that - a one to one device with DC
isolation between windings. How it is subsequently configured is a
different matter. One use is where you can't be sure the line and neutral
of the supply are connected correctly - if they have a ground reference.

--
*To be intoxicated is to feel sophisticated, but not be able to say it.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Phil Allison]

"Chuck"

MCM Electronics has one.

** One what ??




..... Phil

 

[Wild_Bill]

Referring to one (1) of 'em

I think

Yep, they have 'em.

--
Cheers,
WB
..............


"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:hutefl$6rd$1@news-01.bur.connect.com.au...

"Chuck"


MCM Electronics has one.


** One what ??




.... Phil

 

[Cydrome Leader]

bob <sound@inetnebr.com> wrote:

On 6/10/2010 4:57 PM, Cydrome Leader wrote:
GregS<zekfrivo@zekfrivolous.com> wrote:
In article<hur41d$6pu$3@reader1.panix.com>, Cydrome Leader<presence@MUNGEpanix.com> wrote:
JW<none@dev.null> wrote:
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC
plug at the outlet. Prefer one for less than $100 or so, unless that seems
unreasonable. Found one at Mouser for $114 but that's only good for 1.25A.
Getting lots of irrelevant hits on google...

Thanks.

I think the $100 and "good quality" exclude each other for a transformer
that size.

the smaller units as used with cash registers and POS systems tend to max
out at 4 amps.

is used is ok, look for stuff from acme, topaz, oneac, shape, powervar.
powervar even had some interesting ones based off toroidal tranformers if
you want the ooh and aah factor.

Not cheap. Surplus Sales of Nebraska has some.

I'd avoid surplus sales. Why pay twice new prices for old stuff when you
don't have to?

It's an interesting place browse, and I've been there in person, but the
ripoff factor is pretty incredible.



Surplus sales has its place in the food chain. Its NOT a salvage place
that just haphazardly throws stuff in piles, its all gone through
sorted,labeled and cataloged. Lots of nice old ham gear stuff if you
into it. Yea, most of it is not cheap. but try to find some of it from
other sources. Some of the stuff they have will NEVER sell at the prices
they have it at. Everyone knows how hot tube oscilloscopes are.....

With the number of shops closing, i would wait for a going out of
business sale or Ebay.

bob

I think the whole basis for surplus sales is the guy has a really large
building, and can store infinite amounts of crap inside it forever.
Storing something there for decades doesn't seem to waste any space or
compete with shelf space for stuff that does sell.

It's a fun place to checkout if you're ever in Omaha. Lots of stuff on the
floor you can walk around isn't on the website.

Unfortunately the next best place like that that was in chicago called the
Radio TV Lab closed years ago. It was a serious time machine in there. The
guy had NIB replacement parts for wire recorders- and not ones from
planes, but from before magnetic tape worked at all, plus service guides
for pretty much anything with tubes in it. Getting in and out of the shop
was a single file line type operation and people having to all leave to
let customers out wasn't uncommon. Stuff was stacked to the ceilings in
every direction. If you needed a part that wasn't current it was there.

Maybe somebody here knows what this-

He had some sort of capacitor that looked like a large can electrolytic
but it was filled with liquid that sloshed around. I don't recall the
ratings at all.

It was explained that if shaken, and if the case started to feel colder
the cap was still good, sort of like an chemical ice pack.

Does anybody have any idea what sort of capacitor this was?

 

[Cydrome Leader]

Jon Danniken <jonSPAMMENOTdanniken@yahspamhoo.com> wrote:

JW wrote:
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard
AC plug at the outlet. Prefer one for less than $100 or so, unless
that seems unreasonable. Found one at Mouser for $114 but that's only
good for 1.25A. Getting lots of irrelevant hits on google...

Thanks.

You could always salvage a couple of microwave oven transformers and connect
them back to back. Make sure and disconnect the secondaries from the cores
though, of course.

Jon

I've been tempted to try that just to see how awful the regulation is and
what sort of waveform would even come out before the things burned up.

 

[GregS]

In article <5125b83c80dave@davenoise.co.uk>, "Dave Plowman (News)" <dave@davenoise.co.uk> wrote:

In article <87dee7Fdj9U1@mid.individual.net>,
Phil Allison <phil_a@tpg.com.au> wrote:

"JW"

Can anyone recommend a good isolation transformer for sale on-line?

** What kind ??

There are two:

1. Galvanic isolation - for use on a service bench.

2. Neutral conductor isolation.

Most you see offered for sale in the USA are of the *second* kind.



.... Phil

Surely an isolation transformer is just that - a one to one device with DC
isolation between windings. How it is subsequently configured is a
different matter. One use is where you can't be sure the line and neutral
of the supply are connected correctly - if they have a ground reference.

An isolation transfor is typically 1:1.1 in real life.
Its acts as 1:1 with FULL load. Well all transformers are rated FULL LOAD.

They really need to start calling these things different names.
A regular "isolation transformer", and they should not be calling it that,
is NOT ground isolated since the secondary is tied to ground.
The purpose of this transformer is noise reduction, period, using an isolation
transformer.

Find another name.

greg

 

[Dave Plowman (News)]

In article <huu496$2u1$2@usenet01.srv.cis.pitt.edu>,
GregS <zekfrivo@zekfrivolous.com> wrote:

They really need to start calling these things different names. A
regular "isolation transformer", and they should not be calling it that,
is NOT ground isolated since the secondary is tied to ground. The
purpose of this transformer is noise reduction, period, using an
isolation transformer.

In the UK the secondary of a (safety) isolating transformer is *not* tied
to ground - that would entirely defeat the purpose.

So someone needs to invent a new name for your type. ;-)

--
*Funny, I don't remember being absent minded.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.