[Boatanchors] Power supply update

[Brian Harris]

A 2N3055 or other suitable NPN, a 30-32V zener and a resistor will also work in the battery replacement application.

 
Brian Harris
cell 214-763-5977
email cosmophone at yahoo.com


________________________________
 From: Ian Wilson <ianmwilson73 at gmail.com>
To: boatanchors at mailman.qth.net 
Sent: Tuesday, May 1, 2012 11:19 AM
Subject: Re: [Boatanchors] Power supply update
 
The LM317 data sheet also shows how to use a large NPN pass transistor
in a complementary connection with a small PNP transistor. NPN power
transistors are much more common in junk boxes and TV salvage, etc,
in my experience.

73, ian K3IMW

On Tue, May 1, 2012 at 9:02 AM, Jim Wiley <jwiley at alaska.net> wrote:

> Joe -
>
>
> My error - the current boost transistor needs to be a PNP type, not NPN
> - so a 2N3055 won't do.  Perhaps a  MJ15016G  (about $3.00 each at
> Mouser) would be a good choice.
>
>
> -  Jim, KL7CC
>
>
>
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