Author Topic: What is this component?  (Read 824 times)

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Offline wadmancpu

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What is this component?
« on: June 10, 2019, 03:36:11 am »
This is marked SA803S. Anyone know what this is? It's the black one with a green and pink stripe, looks a bit like a resistor. I can't find it listed anywhere. Thanks.
« Last Edit: June 10, 2019, 03:37:42 am by wadmancpu »
 

Offline fzabkar

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Re: What is this component?
« Reply #1 on: June 10, 2019, 04:29:32 am »
Surge Arrestor ???
 

Offline No.Mad

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Re: What is this component?
« Reply #2 on: June 10, 2019, 04:08:42 pm »
Surge Arrestor ???

That would be weird ass surge arrester. I never saw like that one before. I always thought they look like that:

 

Offline fzabkar

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Re: What is this component?
« Reply #3 on: June 11, 2019, 04:31:00 am »
I thought it may have been a DIAC, but the "SA" in the circuit reference didn't seem to fit. It would help to see it in the context of its surroundings.
 

Offline wadmancpu

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Re: What is this component?
« Reply #4 on: June 11, 2019, 06:05:45 am »
Here's a better pic. There is one of these on each winding of the inductor.
 

Offline maginnovision

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Re: What is this component?
« Reply #5 on: June 11, 2019, 06:10:51 am »
Looks like an input filter so it's probably a resistor, though I don't know why they'd have two.

https://interferencetechnology.com/mains-input-filters-what-is-inside-the-box-and-why/amp/
« Last Edit: June 11, 2019, 06:13:10 am by maginnovision »
 

Offline David Hess

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Re: What is this component?
« Reply #6 on: June 11, 2019, 03:36:01 pm »
Normally those parts would be resistors but I do not know what the parts shown are.
 

Offline wadmancpu

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Re: What is this component?
« Reply #7 on: June 12, 2019, 01:15:51 am »
They test with zero resistance so I have no idea.
 

Offline fzabkar

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Re: What is this component?
« Reply #8 on: June 12, 2019, 04:51:21 am »
They test with zero resistance so I have no idea.
Are they in parallel with the inductors?
 

Offline HB9EVI

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Re: What is this component?
« Reply #9 on: June 12, 2019, 09:33:55 am »
normally at the mains filter I'd expect a bleeder resistor, but if it bypasses the CMC winding it doesn't make much sense
 

Online JFJ

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Re: What is this component?
« Reply #10 on: June 12, 2019, 03:36:15 pm »
They test with zero resistance ...

They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies. In circuit, they will appear to have zero resistance, because they're connected in parallel with the common mode choke windings:

 

Offline No.Mad

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Re: What is this component?
« Reply #11 on: June 12, 2019, 04:20:53 pm »
They test with zero resistance ...

They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies. In circuit, they will appear to have zero resistance, because they're connected in parallel with the common mode choke windings:



That's really interesting. Never saw or heard about that one before.
 

Offline David Hess

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Re: What is this component?
« Reply #12 on: June 12, 2019, 07:27:30 pm »
They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies.

That is my guess since a glass resistor would not be used.  I wonder why what is essentially a GDT surge arrest er would be used.
 

Offline maginnovision

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Re: What is this component?
« Reply #13 on: June 12, 2019, 07:49:49 pm »
They look like the surge absorbers (glass encapsulated spark gaps) that Samsung commonly use in their television/monitor power supplies.

That is my guess since a glass resistor would not be used.  I wonder why what is essentially a GDT surge arrest er would be used.

Make warranty repairs cheaper?
 

Offline David Hess

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Re: What is this component?
« Reply #14 on: June 12, 2019, 08:22:02 pm »
That is my guess since a glass resistor would not be used.  I wonder why what is essentially a GDT surge arrest er would be used.

Make warranty repairs cheaper?

By suppressing voltage spikes across the common mode filter?
 

Online duak

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Re: What is this component?
« Reply #15 on: June 12, 2019, 08:42:04 pm »
There is a reason for the TVS bypassing the common mode choke and it is to pass a transient immunity test.  A common mode choke usually has a medium to high mu core that saturates at a fairly low common mode current relative to its current rating.  When a common mode transient voltage is applied to the input, the current rises slowly until the core saturates, the inductance drops like a rock and the energy stored on the input side capacitance is dumped onto the load side.  This current pulse is higher in amplitude and narrower in width than the original transient.

Look up Magnetic Pulse Compressor.

The image shows a 3 stage compressor that can be used for driving things like pulsed lasers.

Ask me how I know,
« Last Edit: June 13, 2019, 04:18:50 pm by duak »
 
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Offline fzabkar

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