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my 35 year old analog multimeter suddenly packed up? Answered



There is no continuity on several cylindrical parts with coloured stripes on them, transistors??. 1 Diode "D1"  does not test either.

Is it possible to identify the parts I marked with red dots in the foto attached so that I can order them from somewhere in the UK. I do not know where from either.


Thank you






























There is no continuity on a few small cylindrical parts no

Comments

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rickharris
rickharris

3 years ago

Meters these days are really cheap. Buy a reasonable digital one - it will be worth it.

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ulindel
ulindel

Answer 3 years ago

All answers were helpful, thanx a lot, this subject is now CLOSED.

I could not find a place to click SOLVED.

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Pablos Casita
Pablos Casita

3 years ago

If you are up for the challenge and you're looking for resistors, I would get them from aliexpress.com (if you're not in a hurry), they are really cheap and I have not had any problems with them.

https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20170902133726&SearchText=resistors

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iceng
iceng

3 years ago

R5= red-brn-blk= 210= 21 ohms 1/2watt or red-brn-grn= 215= 2100000= 210 K

R2= brn-blk-blk= 100= 10 ohms 1watt

R6= red-grn-brn= 251= 250 ohms 1/2watt

R12= red-blk-blk= 100= 10 ohms 1watt

R13= pur-grn-blk= 750= 75 ohms 1watt

R17 can't make out the colors

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Josehf Murchison
Josehf Murchison

Answer 3 years ago

I don't think he needs all them I think he just needs R9 unfortunately it is so badly burnt you can't read the color code.

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ulindel
ulindel

Answer 3 years ago

Thank you, firstly what actually are they, transitors?

What exactly is the method of reading these, e.g R13 you read as "pur-grn-blk, how about the Yellow & Blue bands I can see also on it.

Which end does one start reading from?

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jfryar30272
jfryar30272

Answer 3 years ago

Those are resistors. Transistors have (usually) 3 leads, whereas these only have 2. The colored bands are to identify the resistance.

To read, there is a color pattern. To remember, I start with Black, then Brown. I don't really have a trick to remember these, so you just have to practice. Then comes the middle colors. I remember these with a name, Roy G. Biv - Red, Orange, Yellow, Green, Blue, Indigo (not used), Violet. Then after that, there is Gray and White, and as with Black and Brown, you just have to remember. Then you have Gold and Silver. These are only used for the last band, so you know to start from the other end. The Gold and Silver are used to indicate the tolerance, or accuracy to the rated value.

The first two bands are the values, then the third is the multiplier (for a 4 band resistor). The last is the tolerance.

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Jack A Lopez
Jack A Lopez

Answer 3 years ago

https://en.wikipedia.org/wiki/Electronic_color_code#Resistor_color-coding

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ulindel
ulindel

Answer 3 years ago

Really confused now.

Sorry to bother you all, perhaps this is not for me. I'll just bin the meter.

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Jack A Lopez
Jack A Lopez

Answer 3 years ago

Perhaps, instead of throwing your meter away, you could give it to someone who knows how to fix things?

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jfryar30272
jfryar30272

Answer 3 years ago

I'm sorry. As you might have been able to tell, I'm not the best teacher.

Best of luck, though!

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iceng
iceng

Answer 3 years ago

They are resistors measured in Ohms

Since China got into the game things are a bit more confused.

I try to read the side furthest from the tolerance gold or silver band.

The thing to remember is the last digit is the number of zeros.

See the picture and if you want there is a snappy mnemonic to remember the color order that most engineers know.

resistor-color-code-all.gif
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iceng
iceng

Answer 3 years ago

Here is a nice water analogy of of electricity.

Voltage (volts) is like pressure, Current (amps) is like water flow and Resistance (ohms) is like a constriction in a pipe.

And you get to see what a Zener diode can do to regulate pressure err voltage..

Simple math (V=I x R) Resistance multiplied by Current I equals Voltage...

REGwaterflow.bmp
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ulindel
ulindel

3 years ago

Where exactly can O buy these from?

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ulindel
ulindel

Answer 3 years ago

Thanx icing, bough this one last week & it does not work at all.

I am in the UK, & was referring to where to get the Resistors.

digi.JPG
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steveastrouk
steveastrouk

3 years ago

What state is the fuse in ? Its the most likely part to have failed.

also worth looking at the back of the circuit board to see if there are broken or fused tracks, or bad joints there.

Failing all that, get to Maplin and see what they can offer. Its not likely to be resistor failure

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ulindel
ulindel

3 years ago

rickharris, thank you but prefer the analogue ones , can't understand the digidal ones. My el. knowledge is very-very basic, only read continuity & mains or battery volts.

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iceng
iceng

Answer 3 years ago

Trust the elder educator he was dragged into this digital age kicking and screaming like all of us were.. In the end you will like it...