[Boatanchors] OT : TVS DIODES

[Jay Coward]

I'd use a variable regulator  like the LM-317 in all it's various packages depending on load and dissapation requirements.
 Jay KE6PPF



-----Original Message-----
From: W2HX <w2hx at w2hx.com>
To: W2HX <w2hx at w2hx.com>; boatanchors <boatanchors at mailman.qth.net>; kf4nsradio <kf4nsradio at verizon.net>
Sent: Mon, Sep 10, 2012 5:21 pm
Subject: Re: [Boatanchors] OT : TVS DIODES


I ask because you cannot use a 7812 regulator on a 12V (or 13.8V source).  
ccording to the spec sheet, the 7812 requires 14.5V to maintain line 
egulation. Basically the 7812 was not meant for use in an application like 
ours.  It was meant to regulate an input of 15 to 35V down to 12.
 
3 Eugene W2HX

-----Original Message-----
rom: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-bounces at mailman.qth.net] 
n Behalf Of W2HX
ent: Monday, September 10, 2012 6:24 PM
o: boatanchors at mailman.qth.net; kf4nsradio at verizon.net
ubject: Re: [Boatanchors] OT : TVS DIODES
Is the application to eliminate a small battery on the radio for use with an ac 
ains source or a dc 12v of the vehicle?
73 Eugene W2HX
-----Original Message-----
rom: Dick KF4NS [kf4nsradio at verizon.net]
eceived: Monday, 10 Sep 2012, 6:11pm
o: boatanchors at mailman.qth.net [boatanchors at mailman.qth.net]
ubject: [Boatanchors] OT : TVS DIODES
I know this is a bit off topic but with all the knowledgeable guys here when it 
omes 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 
 gutted battery pack. I have all the components selected including ferrite 
eads for the + - leads from the cigar lighter which is fused at 2A, fed to a 
812 regulator having in and out capacitors as recommended in the applications 
age from the spec sheet.
It has come to my attention that I could protect the input from EMI RFI and 
urge by adding a TVS diode in the power leads. After studying the wealth of 
nformation available on the INET, I am so confused about how to choose the 
ppropriate diode. The filters that Mouser lists for selection of a diode have 
eft 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
t Petersburg, FL 33714 USA
eep The Glow!
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