Electronics > Beginners
How can I tell if parts are ok?
Hextejas:
I have a bunch of resistors and capacitors that t am trying to reuse. They come from a board that had shorted out the IC.
So, I measured all these parts and they read correctly but is there anything else that might have been damaged ?
They all read in according to their marked resistance and capacitance. Is there another parameter that might gave been ruined ?
CatalinaWOW:
Ruined often must be defined in terms of application. Only you can answer some of the questions.
For example, resister temperature coefficients may have changed. All parts failure probability will likely be higher than at manufacture, and totally undefined. Capacitors ESR may have increased. Any of these and others may or may not matter for your application.
The simple answer though, is that for general use they are probably OK. If you have an unlimited budget you would replace them on principal, but on a tight budget go ahead and use them. If some of them have a problem in your application you will get much value out of figuring out why your circuit isn't working. Learning is always priceless.
spec:
--- Quote from: Hextejas on January 29, 2019, 03:34:32 am ---I have a bunch of resistors and capacitors that t am trying to reuse. They come from a board that had shorted out the IC.
So, I measured all these parts and they read correctly but is there anything else that might have been damaged ?
They all read in according to their marked resistance and capacitance. Is there another parameter that might gave been ruined ?
--- End quote ---
Hextejas
Your components will be fine. Many of us strip components from scrap equipment. :)
Of course, for any critical applications, you should only use new components, bought from a reliable source.
CJay:
The capacitors might have been damaged by overvoltage or spikes and still read nominally within tolerance, I definitely wouldn't trust them on high voltage and electrolytics are rarely worth saving (unless you really have no alternative but to recycle them)
Resistors are generally OK to re-use but you need to be careful removing them f4rm the boards because it's possible to damage them by flexing the leads and stressing the end caps however they usually show problems on measurement but they're so cheap to buy it's often not worth the effort recycling them unless they're something special.
The value from stripping boards comes form the soldering experience and the general handling of the boards and, if you're cash poor then yes, you can re-use a lot of components.
There are other reasons too, I sometimes strip old boards because the look of the components is important if you're restoring things or, occasioanlly, I just don't have the part I need in stock for a quick lash up test.
rhb:
--- Quote from: spec on January 29, 2019, 09:43:48 am ---
--- Quote from: Hextejas on January 29, 2019, 03:34:32 am ---I have a bunch of resistors and capacitors that t am trying to reuse. They come from a board that had shorted out the IC.
So, I measured all these parts and they read correctly but is there anything else that might have been damaged ?
They all read in according to their marked resistance and capacitance. Is there another parameter that might gave been ruined ?
--- End quote ---
Hextejas
Your components will be fine. Many of us strip components from scrap equipment. :)
Of course, for any critical applications, you should only use new components, bought from a reliable source.
--- End quote ---
For things like RF relays, pretty much everyone buys scrap as new will give you a nose bleed.
I've somewhat concluded that the best way to store salvage parts is on the original board. The exception being things which are fragile. Attach any documentation, trim or tie wires. Configure to store in minimum volume possible.
Usually you want some major part such as heat sinks or a transformer.
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