[R-390] OT: Wet or Solid Tantalum?

[Skip Frolik]

> Barry N4BUQ writes:
In the National spec sheet for the LM117/317, some of the designs - particularly
the ones for high-current applications - 
show 47uF and even 100uF tantalums (wonder where you find one of those?) across
the output.
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On an old Centronix Printer Board .... You're up in Huntsville Barry.
Just slide over to the arsenal and rob one off all those old junk
printers they have in the back room .... Hehehe.

On a more useful (maybe) note a lot of scrap computer modules (Centronix)
used axial 47 and 100uf caps at 50v. They were made by Nippon Chemi-Com.
I'm pretty sure most of them were of the tantalum type.
I know I've replaced and pirated my share of them .... Hi.

According to Sencore (if you trust them) from their LC102 manual ....

"The lead weld, shown in figure 43, is an identifying characteristic
of the tantalum in electrolytic and is a quick was to differentiate
between an axial lead aluminum lytic and a tantalum lytic. Aluminum
lytics do not have a lead weld on either terminal."

Might come in handy while dumpster diving for components and you
could find you have more tantalums in the junk box then you think
including that elusive 47uf at 50v.

Just some "Babbling BS" for your amusement .... Hi.

Take care.

Skip
WB4GMQ/AAV4HC

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