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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details. |
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11th Nov 2019, 12:18 am | #1 |
Hexode
Join Date: Aug 2014
Location: Wigston, Leicester, UK.
Posts: 351
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H&M component ID
Hi, this H&M 'Executive' transistorised model train controller has got a component that has me puzzled. Its the one in the pic with gold ends. In-circuit it measures 2400 Ohms approx, but the bands indicate it's a 2k one at 10%. Or is it? The bands' spacing is strange, and why has it got gold end caps when the other resistors are 'normal' ones. Thanks in advance for your thoughts.
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11th Nov 2019, 12:23 am | #2 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,554
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Re: H&M component id
My first impression would be a capacitor.
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11th Nov 2019, 12:44 am | #3 |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,577
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Re: H&M component id
For the avoidance of doubt, desolder one end and measure the resistance of this component only. You can never be sure what else you are measuring through unless you take the trouble to reverse engineer the circuit diagram.
Nominally, it looks like a 2K0 resistor but a 2K in-circuit with other paths potentially bypassing it should read 2K0 -or less-, never more, than the marked value. With those metallic looking end caps it could even be a fuse (2A?) although if that was the case then it clearly would be faulty. I take it this is a single channel controller, no similar part in the other channel(s) which you can take comparative measurements from? |
11th Nov 2019, 5:27 am | #4 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,340
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Re: H&M component id
Thick film glazed resistor - https://books.google.com.au/books?id...20caps&f=false
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11th Nov 2019, 9:41 am | #5 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,621
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Re: H&M component id
In the 1960s, Plessey made resistors that looked just like this. However, they were carbon composition types.
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11th Nov 2019, 3:22 pm | #6 |
Tetrode
Join Date: May 2013
Location: Enniscorthy, County Wexford, Ireland.
Posts: 74
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Re: H&M component id
ei7ka my vote is for the 2000ma fuse. regards pierce
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11th Nov 2019, 5:24 pm | #7 |
Hexode
Join Date: Aug 2014
Location: Wigston, Leicester, UK.
Posts: 351
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Re: H&M component ID
Wow! Thanks for all your thoughts! I'll desolder it and investigate further. Cheers All
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11th Nov 2019, 8:26 pm | #8 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: H&M component ID
2.0 is an E24 value which would be 5% tolerance, not 10
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12th Nov 2019, 1:32 pm | #9 |
Hexode
Join Date: Aug 2014
Location: Wigston, Leicester, UK.
Posts: 351
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Re: H&M component ID
Hi, I was scratching my head over that one, till I read the thread from David G4EBT explaining the E numbers, and now it's all clear. So much to learn, so little time....
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12th Nov 2019, 5:53 pm | #10 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,621
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Re: H&M component id
Like this one in my 10 MOhm drawer.
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15th Nov 2019, 12:17 pm | #11 |
Hexode
Join Date: Aug 2014
Location: Wigston, Leicester, UK.
Posts: 351
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Re: H&M component ID
Thank you One and All! This forum
really is a great resource when one becomes bamboozled and needs to seek advice from above.. (or, you lot!) you all contribute with your wealth and breadth of knowledge and experience. Terrific! It turns out that it IS a resistor, and it measures 2430 Ohms so, if it IS 2k@5% then it is poorly and explains why, once I'd replaced a blown transistor, the controller is giving too much volts out when fully on. Trebles all round! |
16th Dec 2019, 3:37 am | #12 |
Hexode
Join Date: May 2005
Location: London 90% , Northwest England 10%
Posts: 386
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Re: H&M component ID
If you reduce the resistance wont the voltage go up
Volts out on an H&M is normally up to 16v DC/AC for point motors and some light circuits. Hornby Dublo trains could take 24v, but the more normal trains have 12v DC as max. |
16th Dec 2019, 9:03 pm | #13 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,347
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Re: H&M component ID
While 20VAC was used for many of the pre-war Hornby "0" gauge electric trains, to the best of my knowledge, Hornby Dublo trains were only ever designed for 12VDC operation (apart from some export models that used 6VDC), with 16VAC for point motors and signals.
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