What is this component? - Page 1
Forum section: electronics / repair

author: wadmancpu
author_rank: Contributor
timestamp: June 10, 2019, 03:36:11 am
content: 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.

author: fzabkar
author_rank: Super Contributor
timestamp: June 10, 2019, 04:29:32 am
content: Surge Arrestor

author: No.Mad
author_rank: Regular Contributor
timestamp: June 10, 2019, 04:08:42 pm
content: Quote from: fzabkar on June 10, 2019, 04:29:32 amThat would be weird ass surge arrester. I never saw like that one before. I always thought they look like that:

author: fzabkar
author_rank: Super Contributor
timestamp: June 11, 2019, 04:31:00 am
content: 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.

author: wadmancpu
author_rank: Contributor
timestamp: June 11, 2019, 06:05:45 am
content: Here's a better pic. There is one of these on each winding of the inductor.

author: maginnovision
author_rank: Super Contributor
timestamp: June 11, 2019, 06:10:51 am
content: 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/

author: David Hess
author_rank: Super Contributor
timestamp: June 11, 2019, 03:36:01 pm
content: Normally those parts would be resistors but I do not know what the parts shown are.

author: wadmancpu
author_rank: Contributor
timestamp: June 12, 2019, 01:15:51 am
content: They test with zero resistance so I have no idea.

author: fzabkar
author_rank: Super Contributor
timestamp: June 12, 2019, 04:51:21 am
content: Quote from: wadmancpu on June 12, 2019, 01:15:51 amAre they in parallel with the inductors?

author: HB9EVI
author_rank: Frequent Contributor
timestamp: June 12, 2019, 09:33:55 am
content: normally at the mains filter I'd expect a bleeder resistor, but if it bypasses the CMC winding it doesn't make much sense

author: JFJ
author_rank: Regular Contributor
timestamp: June 12, 2019, 03:36:15 pm
content: Quote from: wadmancpu on June 12, 2019, 01:15:51 amThey 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:

author: No.Mad
author_rank: Regular Contributor
timestamp: June 12, 2019, 04:20:53 pm
content: Quote from: JFJ on June 12, 2019, 03:36:15 pmThat's really interesting. Never saw or heard about that one before.

author: David Hess
author_rank: Super Contributor
timestamp: June 12, 2019, 07:27:30 pm
content: Quote from: JFJ on June 12, 2019, 03:36:15 pmThat 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.

author: maginnovision
author_rank: Super Contributor
timestamp: June 12, 2019, 07:49:49 pm
content: Quote from: David Hess on June 12, 2019, 07:27:30 pmMake warranty repairs cheaper?

author: David Hess
author_rank: Super Contributor
timestamp: June 12, 2019, 08:22:02 pm
content: Quote from: maginnovision on June 12, 2019, 07:49:49 pmBy suppressing voltage spikes across the common mode filter?

author: duak
author_rank: Super Contributor
timestamp: June 12, 2019, 08:42:04 pm
content: 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,

author: fzabkar
author_rank: Super Contributor
timestamp: June 13, 2019, 04:37:08 am
content: http://www.sourcecomtech.com/wp-content/uploads/2015/09/DSS-Series.pdfhttp://www.mmc.co.jp/adv/dev/chinese/pdf/Division_PDF/dss.pdf