[sdiy] Mystery Caps

[Michael Ruberto]

>
>What was this "further inspection"...?
>

After noticing the marking on one was 474 I got the idea to replace the 
timing cap in a 555 astable on my breadboard and sure enough the frequency 
was no different.

>
>As already suggested, they *might* be varactor diodes.
>

not with a value .47uf.


>But my guess is that they could be glass-encapsulted multi-layer ceramic
>capacitors.  The "50V"  rating sounds like they might be these.
>

hmmm ceramic, so I guess I can assume at least 10% tolerance? is there any 
benefit to glass encapsulation? good humidity resistance?

~M

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