Re: Understanding a split-mode power supply.

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#1625

From: Sylvia Else
Date: Tue, 06 Jan 2009 07:16

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Phil Allison wrote:
>  "Stupider than Anyone Else"
> 
>>>>>> As for whether I could substitute a 6.8, maybe I could, though I'd 
>>>>>> have trouble getting one that has a 350 volt rating.
>>>>>  **   Huh   ??????????
>>>>>
>>>>> No need for that whatsoever.
>>>>>
>>>>> In operation, the resistor is not subjected to more than a few volts.
>>>> As I commented earlier, if the switching transistor fails by shorting 
>>>> out, then the resistor will blow. After it's blown it'll have 340V 
>>>> across it.
>>> ** Irrelevant.
>>>
>>> Once it has fused, the resistor  will be OPEN circuit.
>> Which just means it won't conduct unless the voltage across it exceeds its 
>> insulating properties.
> 
> 
> ** No,  it  WILL  be open circuit to the voltage that caused it to fuse.
> 
> Cos the fusing behaviour will not cease until the part becomes open circuit
> in the given situation.
> 
> 
>>> The voltage across the break can be thousands of volts.
>> So you say, but where's the evidence?
> 
> 
> ** You came here for the advice of folk with experience of electronics,  cos
> you have none.
> 
> That advice is based on many decades of ACTUAL experience, in my case.
> 
> If you simply replace the fusible resistor in the PSU with a similar part,
> then it will work as well as the original one did.
> 
> BTW:
> 
> The maker's max voltage rating relates to a functional resistor -  not a
> blown one.
> 
> There is a HUGE amount of electronics YOU have no clue about.
> 

You seem to have posted the same reply twice.

Sylvia.

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Date: Tue, 06 Jan 2009 18:16:06 +1100
From: Sylvia Else <sylvia@not.at.this.address>
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Subject: Re: Understanding a split-mode power supply.
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