I have a few used isolating transformers that converts 220 volt to 12
volt. They are quite heavy, about 25 oz a piece. I guess there is a lot
of copper inside.

It's similar to this item:
https://www.bonanza.com/items/like/762673355/Trm-Lighting-Components-Transformer-105003-127-60-Va-En-60742-Pri-127V-Sec-12V.
Can't believe it costs $44.9 a piece. I have thrown away few pieces already.

These are old items used to supply 12 volt to light bulbs. Now that most
light bulbs no longer use this low voltage, they have become obsolete.

1) If I use it on 110 volt, do I get 6 volt output?

2) What can one do with these old transformers?

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On Saturday, December 11, 2021 at 5:05:33 AM UTC-5, Johm Smith wrote:
> I have a few used isolating transformers that converts 220 volt to 12
> volt. They are quite heavy, about 25 oz a piece. I guess there is a lot
> of copper inside.
>
> It's similar to this item:
> https://www.bonanza.com/items/like/762673355/Trm-Lighting-Components-Transformer-105003-127-60-Va-En-60742-Pri-127V-Sec-12V.
> Can't believe it costs $44.9 a piece. I have thrown away few pieces already.
>
> These are old items used to supply 12 volt to light bulbs. Now that most
> light bulbs no longer use this low voltage, they have become obsolete.
>
> 1) If I use it on 110 volt, do I get 6 volt output?

Yes.

>
> 2) What can one do with these old transformers?
>

See what similar are selling for on Ebay and list them there.

On Sat, 11 Dec 2021 16:35:26 +0630, Johm Smith
<yky3883@example.invalid> wrote:

>I have a few used isolating transformers that converts 220 volt to 12
>volt. They are quite heavy, about 25 oz a piece. I guess there is a lot
>of copper inside.
>
> It's similar to this item:
>https://www.bonanza.com/items/like/762673355/Trm-Lighting-Components-Transformer-105003-127-60-Va-En-60742-Pri-127V-Sec-12V.
>Can't believe it costs $44.9 a piece. I have thrown away few pieces already.
>
>These are old items used to supply 12 volt to light bulbs. Now that most
>light bulbs no longer use this low voltage, they have become obsolete.
>
>1) If I use it on 110 volt, do I get 6 volt output?
>
>2) What can one do with these old transformers?
yes you will get 6 volts out of a 220/12 transformer if connected to
110 - IF it is just a trasformer. If it is a switch mode power supply,
no.

On 12/11/2021 03:05 AM, Johm Smith wrote:
> I have a few used isolating transformers that converts 220 volt to 12
> volt. They are quite heavy, about 25 oz a piece. I guess there is a lot
> of copper inside.

https://www.ei-lamination.com/transformer-construction/

Probably a lot more silicon steel than copper, or there may be no copper
at all. In the '60s the price of copper was very high and aluminum was
often used instead.

On Saturday, December 11, 2021 at 5:05:33 AM UTC-5, Johm Smith wrote:
> I have a few used isolating transformers that converts 220 volt to 12
> volt. They are quite heavy, about 25 oz a piece. I guess there is a lot
> of copper inside.
>
> It's similar to this item:
> https://www.bonanza.com/items/like/762673355/Trm-Lighting-Components-Transformer-105003-127-60-Va-En-60742-Pri-127V-Sec-12V.
> Can't believe it costs $44.9 a piece. I have thrown away few pieces already.
>
> These are old items used to supply 12 volt to light bulbs. Now that most
> light bulbs no longer use this low voltage, they have become obsolete.
>
> 1) If I use it on 110 volt, do I get 6 volt output?

Depends on the type of transformer. Grab a meter and check it.

>
> 2) What can one do with these old transformers?

Power LED light strips with your dryer receptacle. ;-)

If you do get 6V and depending on your need, you might be able to use a 6V to 12V step-up converter:

https://www.amazon.com/Converter-DROK-Voltage-Regulator-Transformer/dp/B01L90B3RI

In addition, in theory, you should be able to wire them up as a voltage doubler.

https://i.stack.imgur.com/RRzbi.png

The thread that that image came from was actually discussing doubling 6kV to get 12kV.

Nope, no thank you. I played with that kind of voltage in the service. Not any more.

https://electronics.stackexchange.com/questions/77476/does-combining-two-separate-transformers-double-the-voltage

Johm Smith <yky3883@example.invalid> wrote

> I have a few used isolating transformers that converts 220 volt to 12
> volt. They are quite heavy, about 25 oz a piece. I guess there is a lot of
> copper inside.

Nope, the weight is due to the iron core.
>
> It's similar to this item:
> https://www.bonanza.com/items/like/762673355/Trm-Lighting-Components-Transformer-105003-127-60-Va-En-60742-Pri-127V-Sec-12V.
> Can't believe it costs $44.9 a piece. I have thrown away few pieces
> already.

> These are old items used to supply 12 volt to light bulbs. Now that most
> light bulbs no longer use this low voltage, they have become obsolete.

> 1) If I use it on 110 volt, do I get 6 volt output?

Yep.

> 2) What can one do with these old transformers?

Trow them at the cat when you can see it shitting on the carpet.

> --
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus

You should turn that off.

When we were in Europe the power was 220, but the frequency was 50 Hz rather than the US 60.

I would think you would still get 6 volts out of 110, but if that transformer was designed for a different frequency it might be noisy, etc.

In article <6b55c21f-93c0-40f6-89b8-da1527aed88dn@googlegroups.com>,
timothy42bach@gmail.com says...
>
> When we were in Europe the power was 220, but the frequency was 50 Hz rather than the US 60.
>
> I would think you would still get 6 volts out of 110, but if that transformer was designed for a different frequency it might be noisy, etc.
>
>

Common transformers designed for 50 Hz actually run slightly cooler on
60 Hz. Going from a 60 Hz to a 50 Hz system and the transformer may run
hot enough to be damaged after a period of time.

For the origional poster you could probably put 2 or 3 in serise if you
pay attention to the phasing to get 12 or 18 volts. Primariers go in
parallel, secondaries go in series.

On 12/12/2021 07:31 AM, Ralph Mowery wrote:
> In article <6b55c21f-93c0-40f6-89b8-da1527aed88dn@googlegroups.com>,
> timothy42bach@gmail.com says...
>>
>> When we were in Europe the power was 220, but the frequency was 50 Hz rather than the US 60.
>>
>> I would think you would still get 6 volts out of 110, but if that transformer was designed for a different frequency it might be noisy, etc.
>>
>>
>
> Common transformers designed for 50 Hz actually run slightly cooler on
> 60 Hz. Going from a 60 Hz to a 50 Hz system and the transformer may run
> hot enough to be damaged after a period of time.
>
> For the origional poster you could probably put 2 or 3 in serise if you
> pay attention to the phasing to get 12 or 18 volts. Primariers go in
> parallel, secondaries go in series.
>

https://energycentral.com/c/iu/transformer-polarity

Maybe tl;dr, but it explains transformer polarity. The article is
written about line transformers but applicable to all.

On Sunday, December 12, 2021 at 9:32:04 AM UTC-5, Ralph Mowery wrote:
> In article <6b55c21f-93c0-40f6...@googlegroups.com>,
> timoth...@gmail.com says...
> >
> > When we were in Europe the power was 220, but the frequency was 50 Hz rather than the US 60.
> >
> > I would think you would still get 6 volts out of 110, but if that transformer was designed for a different frequency it might be noisy, etc.
> >
> >
> Common transformers designed for 50 Hz actually run slightly cooler on
> 60 Hz. Going from a 60 Hz to a 50 Hz system and the transformer may run
> hot enough to be damaged after a period of time.
>
> For the origional poster you could probably put 2 or 3 in serise if you
> pay attention to the phasing to get 12 or 18 volts. Primariers go in
> parallel, secondaries go in series.

I posted this for the OP yesterday.

https://i.stack.imgur.com/RRzbi.png

On Sun, 12 Dec 2021 09:43:18 -0800 (PST), Marilyn Manson
<comawhiteknuckles@gmail.com> wrote:

>On Sunday, December 12, 2021 at 9:32:04 AM UTC-5, Ralph Mowery wrote:
>> In article <6b55c21f-93c0-40f6...@googlegroups.com>,
>> timoth...@gmail.com says...
>> >
>> > When we were in Europe the power was 220, but the frequency was 50 Hz rather than the US 60.
>> >
>> > I would think you would still get 6 volts out of 110, but if that transformer was designed for a different frequency it might be noisy, etc.
>> >
>> >
>> Common transformers designed for 50 Hz actually run slightly cooler on
>> 60 Hz. Going from a 60 Hz to a 50 Hz system and the transformer may run
>> hot enough to be damaged after a period of time.
>>
>> For the origional poster you could probably put 2 or 3 in serise if you
>> pay attention to the phasing to get 12 or 18 volts. Primariers go in
>> parallel, secondaries go in series.
>
>I posted this for the OP yesterday.
>
>https://i.stack.imgur.com/RRzbi.png

The biggest problem with using transformers at lower than rated
voltage is you are not saturating the core and they won't put out the
rated output. (va)
The no load voltage may look OK but you can't get close to the rated
amps. The voltage will sag.

Ralph Mowery <rmowery42@charter.net> wrote
> timothy42bach@gmail.com wrote
>> When we were in Europe the power was 220, but
>> the frequency was 50 Hz rather than the US 60.
>> I would think you would still get 6 volts out of 110,
>> but if that transformer was designed for a different
>> frequency it might be noisy, etc.

> Common transformers designed for 50 Hz actually run slightly cooler
> on 60 Hz. Going from a 60 Hz to a 50 Hz system and the transformer
> may run hot enough to be damaged after a period of time.

Yeah, we had a brand new mass spectrometer that had a full
melt down and fire in hours after it was first installed due to
the 50Hz mains with it designed for the US 60Hz system.
> For the origional poster you could probably put 2 or 3 in serise if you
> pay attention to the phasing to get 12 or 18 volts. Primariers go in
> parallel, secondaries go in series.
>

On 12/11/21 4:05 AM, Johm Smith wrote:
> I have a few used isolating transformers that converts 220 volt to 12
> volt. They are quite heavy, about 25 oz a piece. I guess there is a lot
> of copper inside.
>
>  It's similar to this item:
> https://www.bonanza.com/items/like/762673355/Trm-Lighting-Components-Transformer-105003-127-60-Va-En-60742-Pri-127V-Sec-12V.
> Can't believe it costs $44.9 a piece. I have thrown away few pieces
> already.
>
> These are old items used to supply 12 volt to light bulbs. Now that most
> light bulbs no longer use this low voltage, they have become obsolete.
>
> 1) If I use it on 110 volt, do I get 6 volt output?
>
> 2) What can one do with these old transformers?
>

In theory , yes...but many transformers are not efficient at lower
voltages, so under load, the output may drop below 6 volts.

No harm in giving it a try.

Johm Smith <yky3883@example.invalid> Wrote in message:

>I have a few used isolating transformers that converts 220 volt to 12 volt. They are quite heavy, about 25 oz a piece. I guess there is a lot of copper inside.

Maybe. They could very well be wound with aluminum.

>Now that most light bulbs no longer use this low voltage, they have become obsolete.

Hmm? This must be a country or regional thing?

>1) If I use it on 110 volt, do I get 6 volt output?

If it's actually just an ac transformer and not some type of
switching power supply than yes it should. But you might not
saturate the core due to the lower than expected voltage. If this
is the case even if you do get 6volts under no load It will
likely drop a considerable amount when you do put it under load.
You may not get the rated available amperage in other words. You
can always take a voltage reading before and during a load
condition and see what it does.

It really depends on the transformer design and windings. Sorry we
can't be more specific.

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