Electronics > Beginners

Air gap variable capacitors - buy cheap?

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rhb:
The issue is space.  The thrift has gotten a new location, so we'll be able to do more.  But the stuff accumulates at a staggering rate.  The population is only 7500.  So there is just not a lot of market for dead consumer electronics.  In 11 years I've met one person who did component level work.  He gave me a Motorola R2008C/HC in need of TLC when he moved away.

I have observed that solder flux residue is a significant cause of failures in humid climates.  I plan to make a isopropyl alcohol pressure washer using an electric fuel pump and a modified air brush with a redistiilation system to recycle the alcohol.

I'm then going to collect a bunch of cosmetically good, non-functional stuff and do a formal experiment to see what fraction of the devices can be repaired by simply cleaning them.  I've now repaired 8-10 devices just by cleaning off the flux residue with a spray bottle and toothbrush.  The most spectacular example being a dead 34401A DMM from eBay.

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