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Old 11th Nov 2019, 12:18 am   #1
nicam49
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Default 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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Old 11th Nov 2019, 12:23 am   #2
Refugee
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Default Re: H&M component id

My first impression would be a capacitor.
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Old 11th Nov 2019, 12:44 am   #3
SiriusHardware
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Default 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?
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Old 11th Nov 2019, 5:27 am   #4
Terry_VK5TM
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Default Re: H&M component id

Thick film glazed resistor - https://books.google.com.au/books?id...20caps&f=false
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Old 11th Nov 2019, 9:41 am   #5
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Default 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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Old 11th Nov 2019, 3:22 pm   #6
space charge
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Default Re: H&M component id

ei7ka my vote is for the 2000ma fuse. regards pierce
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Old 11th Nov 2019, 5:24 pm   #7
nicam49
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Default Re: H&M component ID

Wow! Thanks for all your thoughts! I'll desolder it and investigate further. Cheers All ��
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Old 11th Nov 2019, 8:26 pm   #8
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Default Re: H&M component ID

2.0 is an E24 value which would be 5% tolerance, not 10
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Old 12th Nov 2019, 1:32 pm   #9
nicam49
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Default 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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Old 12th Nov 2019, 5:53 pm   #10
dazzlevision
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Default Re: H&M component id

Quote:
Originally Posted by dazzlevision View Post
In the 1960s, Plessey made resistors that looked just like this. However, they were carbon composition types.
Like this one in my 10 MOhm drawer.
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