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Damaged resistors

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Scarr

Member
Hi All,

I am being told be a supplier that standard UK mains spike could damage the resistors in this circuit. Can you take a look at this circuit diagram and answer the following questions

A:Would would be the voltage required to damaged R36 & R47
B:In your opinion would this be possible with standard UK mains


Thanks

Steve
 

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Colin

Active Member
1u gives 70mA in full wave. You have 2 in series = 35mA 35mA through 180R = 250mW
Voltage to damage would be 1kv
 

audioguru

Well-Known Member
Most Helpful Member
In addition to a fairly long duration high current damaging a resistor, a short duration voltage spike can also damage a resistor by its arc. The resistor might be rated at only 300V when the normal peak voltage of 240VAC is 340V and a spike will be much higher.
 
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