[Boatanchors] OT : TVS DIODES

[W2HX]

Is the application to eliminate a small battery on the radio for use with an ac mains source or a dc 12v of the vehicle?

73 Eugene W2HX

-----Original Message-----
From: Dick KF4NS [kf4nsradio at verizon.net]
Received: Monday, 10 Sep 2012, 6:11pm
To: boatanchors at mailman.qth.net [boatanchors at mailman.qth.net]
Subject: [Boatanchors] OT : TVS DIODES

I know this is a bit off topic but with all the knowledgeable guys here when it comes to some of  the
new stuff, I hope someone can help.

I have put together a battery eliminator for use of my HT in the car, built into a gutted battery pack. I
have all the components selected including ferrite beads for the + - leads from the cigar lighter which
is fused at 2A, fed to a 7812 regulator having in and out capacitors as recommended in the applications
page from the spec sheet.

It has come to my attention that I could protect the input from EMI RFI and surge by adding a TVS diode
in the power leads. After studying the wealth of information available on the INET, I am so confused
about how to choose the appropriate diode. The filters that Mouser lists for selection of a diode have
left me totally in doubt. I am referring  to the INFINEON brand of  diodes.

Anyone with any experience and advice to share would be greatly appreciated.

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

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