Electronics > Beginners
How can I tell if parts are ok?
bd139:
I reuse quite a lot of stuff. Resistors, capacitors, the lot. Sometimes it's fun to see what you can build with crap lying around.
As for testing, a lot of it is quick finger in the air ohmmeter check and then use it and compare to expected circuit performance. If it doesn't work, debug it then. I rarely if ever get any faulty components other than shorted tantalum caps.
Here's an example of something I threw together from a Tek plugin I bought for the sweep IC (to fix another scope), adding only a crystal:
spec:
--- Quote from: rhb on January 29, 2019, 09:36:37 pm ---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.
--- End quote ---
I learned the same lesson. :-+
bd139:
I used to strip the parts off. Can empty a board in minutes. Nothing more frustrating than finding a part on the board you want and then buggering it up desoldering it, which does happen quite often.
Doctorandus_P:
I used to have a lot of fun scaging old parts from used equipment.
Those old components almost always work well, with the esception of electrolytic capacitors.
Over the years this has been changing though.
Now I often buy new stuff. I would rather spend I needed to scavange old stuff on building / designing something new.
Also, those cheap assortment boxes from Ali / Ebay / China make it seem silly to remove random small parts from PCB's. Why spend time desoldering TO92 transistors when you can buy an assortment of 600 of them for EUR 8. All new and with nice long and straight legs which fit a breadboard nicely.
james_s:
Well when you scavenge parts off old boards, you can be reasonably certain that the parts are genuine and not counterfeit junk. I keep a box of old boards around that have either interesting bits, or things that look potentially useful. Often I need some random part and don't want to wait for a new one to arrive so I'll harvest it from a scrap board.
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