Electronics > Beginners

Replace Ceramic disc capac

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james_s:
It's always a good idea to test something out thoroughly before you start tearing it apart to try to fix it. Those little bulbs are often called "grain of wheat" lamps, I replaced the bulb in a receiver recently and just used an LED with an appropriately calculated series resistor. If the supply to the lamp is AC you can use a small bridge rectifier ahead of it.

onedumbquestion:
You mean the resistor is connected in series?

onedumbquestion:
 My old bulb is 4mm replacements come in 3mm or 4.7mm

james_s:
So? Is the physical size critical? A smaller bulb will fit in most cases.

If you don't know how to wire up an LED with a resistor I'm hesitant to advise on poking around inside mains powered equipment.

onedumbquestion:
Sorry I confused series with parallel What's the value to use ?

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