[sudo-discuss] 120V isolation transformer?

[Cere Misc]

I'll volunteer to take apart the microwave (see them on the street all the
time). Never taken apart a microwave before.

On Aug 25, 2016 2:32 PM, "Jake" <jake at spaz.org> wrote:

> this is definitely a decent way to do it.
>
> microwave transformers are constructed with all the E's on one side and
> all the I's on the other, and then welded together with a thin bead.  This
> means that using an angle grinder with an abrasive cutting disk (and safety
> gear!) you can cut the weld so that you can remove the bottom of the
> transformer.  Then you remove the high-voltage winding and install another
> primary winding with a similar number of turns as the original primary.  If
> you have two identical microwave oven transformers (MOTs) you can just open
> both and move the primary from one to the other.
>
> If you add a variac you can tune the voltage, but you could also do that
> by putting multiple connections along the last part of one of the
> primaries, and then a rotary switch to select between them.
>
> the important part is that the transformer isolates the equipment so that
> people are less likely to die in your hackerspace.
>
> On Thu, 25 Aug 2016, Cere Misc wrote:
>
> Take apart a microwave and use it’s core to create a isolated set of
>> windings at whatever ratio then connect it to a variac?
>>
>> On Wed, Aug 24, 2016 at 3:58 PM, Jake <jake at spaz.org> wrote:
>>
>> https://en.wikipedia.org/wiki/Voltage_regulator#Constant-vol
>>> tage_transformer
>>>
>>> On Wed, 24 Aug 2016, hol at gaskill.com wrote:
>>>
>>> Just out of curiosity, can you share a bit more about waveform
>>>
>>>> distortion?  Was just looking at schematics for a 12-pulse converter and
>>>> different winding configurations
>>>> https://en.wikipedia.org/wiki/HVDC_converter#Twelve-pulse_bridge
>>>> On 2016-08-19 01:24, robb wrote:
>>>>
>>>> ty for trying to save my life, jake
>>>>
>>>>>
>>>>> On Thu, Aug 18, 2016 at 11:05 PM, Jake <jake at spaz.org> wrote:
>>>>>
>>>>> does sudoroom have an isolation transformer?  it's something that plugs
>>>>>
>>>>>> into a regular outlet and outputs the same voltage, but it's
>>>>>> isolating.
>>>>>>
>>>>>> we have a couple of universal AC converter boxes which provide 240VAC
>>>>>> when you plug them into 120VAC but they are "autotransformers" and
>>>>>> they
>>>>>> don't isolate.
>>>>>>
>>>>>> I want us to have an isolating transformer so that when people
>>>>>> experiment with AC-powered devices, they are much less likely to
>>>>>> suffer a
>>>>>> lethal shock and die.
>>>>>>
>>>>>> note:  some voltage-regulator transformers are isolating, but since
>>>>>> they distort the waveform in order to achieve the voltage
>>>>>> stabilizing, they
>>>>>> are not ideal for our purposes.
>>>>>>
>>>>>> thank you,
>>>>>> -jake
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>>>>>>
>>>>>>
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