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Author Topic: diodes and resistors  (Read 181 times)
jmmrlm

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« on: February 10, 2020, 09:36:44 PM »

I have a Miniatronics Rail Yard Spot Light 72-118-01. It has a diode and a resistor.

Being new to this hobby, could someone please tell me how to distinguish between  the diode and the resistor on this Spot Light ? One is of a brown color, the other is bluish.

thanks,
Jamsheed
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Len

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« Reply #1 on: February 11, 2020, 12:25:15 AM »

Normally a diode will only have a single white band on one end, indicating the cathode (negative) end of the diode. Resistors will have multiple bands of different colors showing it's resistance value.

You can also use a multimeter to check. Set it to measure resistance. The diode will show a very low resistance, possibly even '0' when the '+' lead is connected to the anode (positive) end and the '-' lead to the cathode (negative end). Reversing the leads will show a very high resistance, possibly even an 'OL' (Overload) condition. A resistor will read the same, regardless which way the leads are connected.

Len
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If at first you don't succeed, throw it in the spare parts box.
jmmrlm

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« Reply #2 on: February 11, 2020, 11:36:43 AM »

Len - thank you.
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jward


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« Reply #3 on: February 13, 2020, 08:08:05 AM »

Resistors are often a light brown colour with a dumbell shape. There will always be 3 or 4 stripes on a resistor, each stripe indicates a numerical value that taken all together will tell you the value in ohms and tolerence of the piece.
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Jeffery S Ward Sr
Pittsburgh, PA
Len

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« Reply #4 on: February 13, 2020, 08:25:44 AM »

If you really want to know, there's a chart here that will let you find the value of the resistor:
http://www.resistorguide.com/standards-and-codes/resistor-color-code/resistor_color_codes_chart/

Len
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If at first you don't succeed, throw it in the spare parts box.
jmmrlm

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« Reply #5 on: February 13, 2020, 11:48:04 AM »

thank you all for your advice. much appreciated.
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