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Resistor search. NON VW
Posted: 27 Jan 2024, 06:33
by maxstu
Looking for a replacement four band resistor. Brown/black/yellow/gold is 100K ohms. But how do l determine wattage? I've seen this four band resistor in 1/4 watts up to 4 watts and not sure which one to purchase.
This is for the thermostat on/off switch illuminating the tell-tale bulb in an old 240v dimplex electric heater.
Regards,
Stuart
Re: Resistor search. NON VW
Posted: 27 Jan 2024, 08:59
by Aidan
looks like 1/4 watt doing a picture search
Re: Resistor search. NON VW
Posted: 27 Jan 2024, 10:44
by ZsZ
By size and data chart.
https://www.wjoe.com/resistor_resources.htm
There are quite a few size standards but these are about common sizes
Re: Resistor search. NON VW
Posted: 27 Jan 2024, 11:28
by maxstu
Great stuff and many thanks to both.
The top one at 0.25W but on 100k ohms will match.
As the current resistor in my Dimplex heater has no continuity l assume it is dead? And the illumination bulb is toast as well, then?
This failure coincides with a recent local power cut. So l reckon change the resistor like for like and get a new bulb and we have illuminations again.
Now to find a replacement bulb 15.5mm by 6mm. Or will this bulb l have work, instead?
Re: Resistor search. NON VW
Posted: 27 Jan 2024, 20:13
by tobydog
576-513 is rated at 14 volts. If you connect it to 230v it's going to have a very short lifetime... bout 0.02 seconds
What happened to the legs on the neon lamp sitting on the package?
Have a look at:
https://uk.farnell.com/multicomp/mc0801 ... &source=CJ
&
https://www.farnell.com/datasheets/3577159.pdf
How did you check the resistor?