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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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18th May 2023, 8:42 pm | #1 |
Octode
Join Date: Dec 2006
Location: Colchester, Essex, UK.
Posts: 1,076
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120 volt choke
I am working on a US built one arm bandit/ fruit machine.. The 120 volt choke has burnt out in the panel lighting circuit. Would the choke from a 240 volt tube light work ?
Mike. |
18th May 2023, 8:56 pm | #2 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,195
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Re: 120 volt choke
Hi Mike, it would probably restrict the current too much, have too big an impedance.
Ed |
18th May 2023, 9:12 pm | #3 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,326
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Re: 120 volt choke
They are available, just do a search.
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19th May 2023, 8:40 am | #4 |
Octode
Join Date: Dec 2006
Location: Colchester, Essex, UK.
Posts: 1,076
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Re: 120 volt choke
Hi Ed, any idea what the ohms reading on a voltmeter would be for a 110 volt choke.?
Power required is very small, as the tube is only around 6'' long. |
19th May 2023, 9:23 am | #5 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,195
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Re: 120 volt choke
Hi Mike, not easy to determine as it will depend on several factors. I would expect a 100 or so ohms, but it is the inductance that sets the current into the tube
Ed |
19th May 2023, 9:35 am | #6 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,762
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Re: 120 volt choke
I have just checked one , 180 ohms and 2.8 Henry. Mick.
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19th May 2023, 10:51 am | #7 |
Hexode
Join Date: Oct 2012
Location: London, UK.
Posts: 498
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Re: 120 volt choke
Note if you are running it on a 120v 50Hz supply the choke will need more inductance than on a 60Hz supply.
Could this be why the original choke burnt out? |
19th May 2023, 11:44 am | #8 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,762
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Re: 120 volt choke
It doesn't seem to be a problem in the Juke boxes I restore amps for a chap that has quite a collection . Mick.
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19th May 2023, 11:45 am | #9 |
Nonode
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 2,129
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Re: 120 volt choke
USA fluorescent lamp ballasts used in the UK within UK appliances tend to have a short life due to the frequency being wrong.
A ballast intended for 60 cycles, will at 50 cycles pass extra current and run hotter. This may be partially offset by reducing the supply voltage, for example use of a 110 volt 50 cycle supply instead of 120 volts 60 cycles. For a modern replacement, consider a multi-standard electronic ballast. These are suitable for any likely supply voltage and frequency. |
19th May 2023, 12:17 pm | #10 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,271
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Re: 120 volt choke
I was going to suggest a universal input electronic ballast but broadgage beat me to it! RS do a range of 110-240AC input ballasts with anywhere from 4-30W output.
But do check the datasheets as the RS blurb seems incapable of getting the specs right on their product pages.
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Kevin |