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[time-freq] TADD-1 Question

John Ackermann N8UR jra at febo.com
Sat Apr 14 20:27:31 UTC 2007

Hi Matt --

Sorry about the missing part!  If you'd like, I can send you the 0.33uF

The data sheet for the 78XX series regulators shows the 0.33 cap on the
input, but doesn't specify what type it must be, so I think you're OK
using a ceramic or other non-polarized cap.  We ended up using a
tantalum cap for the production units because it's what we had in stock. :-)


Matt Osborn said the following on 04/14/2007 04:08 PM:
> I received my TADD-1 kit this morning and found that capacitor C40
> (.33ufd) was missing.  The silkscreen has this as non-polarized, but
> the documentation says that it is polarized.
> From the circuit, it doesn't appear to matter what type of capacitor
> is used but before I plug something in from my junk box, I thought I'd
> better ask why C40 was changed from non-polarized and just what kind
> of polarized capacitor would be best.
> Thanks for the help.
> -- kc0ukk at msosborn dot com
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