Isolation transformer source
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From: JW on 10 Jun 2010 09:44 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.
From: Dave Plowman (News) on 10 Jun 2010 10:39 In article <4aq11618vo0cnvj8nbo18ltall6f560043(a)4ax.com>, JW <none(a)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(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Cydrome Leader on 10 Jun 2010 12:31 JW <none(a)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.
From: Dave Plowman (News) on 10 Jun 2010 13:01 In article <hur41d$6pu$3(a)reader1.panix.com>, Cydrome Leader <presence(a)MUNGEpanix.com> wrote: > JW <none(a)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(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: GregS on 10 Jun 2010 13:08
In article <hur41d$6pu$3(a)reader1.panix.com>, Cydrome Leader <presence(a)MUNGEpanix.com> wrote: >JW <none(a)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 |