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Archive for the ‘Scrounging’ Category

Audio Amplifier and UPS Scrounging

Posted by aonomus on July 13, 2008

Well here is a two parter for my readers, first off I came across a old audio amplifier and a pair of UPS’s whose batteries were dead (inverters were fine but batteries were worth 90% of original cost!), so I pulled out the old soldering iron and went at it.

I have fewer pictures this time, but the end result of the amplifier was a tray of capacitors and some higher power resistors plus a few other bits.

As for the UPS’s, they were APC backUPS 350 and 500 VA models, the power bar/brick model from a few years back. Both of them had failed batteries and unfortunately due to the way the economy works, like inkjet printers, refills and supplies cost more than a new one. I originally bought these on special, so the batteries would cost more than the UPS. The end result was a pile of IRF640 and IRFZ48 mosfets, some caps and a few transformers as well as the dead batteries (which I did try to recondition before I wrote these off).

And another quick update, some parts for my spectrum analyzer arrived, a large pile of LED’s, some trim pots, and connectors to use. The major shipment with digikey won’t ship until the most important (and therefore the only backordered part) LM3915’s arrive to their distribution warehouse. The shipment contains a ton of other parts such as 2n3055 transistors (and higher power counterparts) for a simple flyback driver, some IRFP450 mosfets for a ZVS flyback driver, and other goodies.

Posted in Audio Spectrum Analyzer, Electronics, Scrounging | Leave a Comment »

Heat Gun Salvaging/Scrounging

Posted by aonomus on May 12, 2008

Well, I recently got a shiny new heat gun, and decided to take it to a old Bay Networks token ring hub – a really old 1.5U paperweight^W boat anchor.

The basis of heat gun salvaging can be found here, but to sum it up in a few words, take a heat gun set to 450degC – 500 degC, apply heat gently until solder melts, and remove part with pliers. In some cases the part can be heavy enough to fall out under its own weight or if the board is shaken enough, but in general pliers seem to work the best.

Out of the whole mess I got:

  • A small pile of SMD 74HC(T)00s, EPROMs circa 1991, some GAL’s
  • 7 Assorted small inductors, 6 SMD relays (pins bent for through-hole use)
  • 25 Optoisolators (MOC8020)
  • 5 Oscillators (8mhz, 2x 20mhz, 25mhz, 32mhz)
  • 11 SMD tantalum caps, 47 electrolytic SMD caps
  • A Dallas DS1245-100 Non-volatile SRAM package (1024k, priced at $20-30 on digikey!)
  • Unknown ‘Valor SF1161’ packages (anyone know what these are? or Valor FL1144’s, comment!)
  • A large modular Cherokee power supply for 5V at 18A, 12V at 4A, and -12V at 1A with integral heatsink
  • An odd CDM102 LED display which doesn’t have any datasheet, 5×12 (if you have a datasheet for this, let me know please!)
  • 3x 50mm brushless fans
  • Various connectors, headers, a few switches.

And I didn’t even salvage *all* the components, I just got lazy and salvaged most of the useful ones and avoided the ASICs or obsolete controllers for token ring, although I *do* have a large stack of token ring controllers which may make good 20kv capacitor bank fodder.

Pictures within (warning not 56k friendly!)

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