[HBQRP] qrp-tech transistor radio project information

w9hzc at cox.net w9hzc at cox.net
Sat Jul 12 22:57:39 EDT 2014 

>From Dar
Here is the link to the design site that I spoke about at the meeting.
---> http://www.qrp.pops.net/
Many usefull lessons to be learned. Will be a big help with this radio project/
---
KB0KA - Bruce?  let me know if you get this.

-- end of Dar's message--

---- Ray McNally <raymcn at gmail.com> wrote: 
>   To all interested in the Transistor radio build project currently in
discussion on the QRP-TECH yahoo group.  This is a consolidation of the
information I have at this time.

  I encourage those interested to join the yahoo group "qrp-tech" and all
related msg traffic be posted there to respect the work effort of Chuck
Adams and all on the qrp-tech group.

73,
Ray - N5SEZ

=====

Related to the AM BC radio project in the fall.  i posted
earlier in the year that this year is the 60th anniversary
of the portable transistor radio.  Although not QRP related,
other than homebrewing and being a receiver, I thought it would
be fun to build an ALL transistor radio.  There were no ICs
in 1954, so no ICs should be used in the spirit of this
exercise.  Some of the posts right after my initial post started
out with audio ICs.  BZZZZZT!!!

You can build a DC, regen or superhet of your choice.
Google for AM BC transistor radio or other combo of
keywords and you will get a ton of information and
schematics.  No posting of schematic references until
AFTER you get one built, working or not.  Working to
brag and not working to ask for help.  :-)  Has to be
a project started after July 1, 2014.  Restart one that
you previously started but did not complete.

The goal here is not to reproduce an old design.  The
parts are scarce or impossible to find, so get creative.
You've got more choices on the transistors with Si. The
reason to refresh the transistor fundamentals and
determine biasing requirements, etc.

Can you build one from the junk box.  Cheap?  Expensive
and lots of transistors?

Can you even find an old radio to repair or get working?
Did it cost you an arm and a leg off of fleabay?  Think how
many transistor radios have gone into the landfills of the
world.  Yikes...

I have several thousand transistors in my stock and I need to
start using them at a rapid rate, so this is one project to
use a few dozen or so in experimenting.

------------------------Transistor Fundamentals-----------------

So, as a refresher on transistor circuitry, I thought that
I would go through a book or two.  Since I am away from
the lab for two months, time to do some writing and some
theory work.

Since there is not one text or QRP book that all 1800+ of
this group owns, discussions will be restricted to online
material only.  Yes, I know you have your favorite book that
is not online, but it doesn't do the rest of us any good if
we can't reference the same thing.  Takes a month to go
through the local public library to get an interlibrary loan.

Here are two books that I found online.  I'm going through
the Ritchie book as it has exercises and problems to test
the progress through the material.  It is a freshman college
textbook.


-----------------Transistor Fundamentals Reference Materials---------

Books:

<http://tinyurl.com/ojte9sn> <http://tinyurl.com/ojte9sn>   "Transistor
Circuit Techniques" by Ritchie
<*http://tinyurl.com/onlz63j <http://tinyurl.com/onlz63j>>* "Principles of
Transistor Circuits" by Amos and James

Online URL Materials:

<http://ecee.colorado.edu/~bart/book/contents.htm>
<http://ecee.colorado.edu/%7Ebart/book/contents.htm>

---------------------------------------------------------------------------

There are a number of youtube videos and courses, but
I find them not to be complete or well organized.  IMHO.

Do not top post to this material.  Edit and bottom post your
additions and add reference material within the -------------- delimiters
on reference materials.  Please.  Top postings will be deleted.
The purpose of this rule is to stop the exponential growth of
postings that get too (*&(@#*&$( long to read or just
occupy time and space for no reason......

Thanks in advance,

chuck, k7qo


As is the procedure with all projects, this is optional.  Participate, if
you can, to demonstrate that this is a group that does things and
likes to get down and dirty in the lab......  Building should be done
in the late fall and hopefully done by early November to allow use
of the radio for DX'in when the QRN is low and propagation is
good.  Another project is to run the radio 24/7 to determine MTTF
(mean-time-to-failure) of the transistors themselves.  20,000 Hrs+??

=====

Forgot about the TI book from archive.org....

-----------------Transistor Fundamentals Reference Materials---------

Books:

<http://tinyurl.com/ojte9sn> <http://tinyurl.com/ojte9sn>   "Transistor
Circuit Techniques" by Ritchie
<*http://tinyurl.com/onlz63j <http://tinyurl.com/onlz63j>>* "Principles of
Transistor Circuits" by Amos and James

<*http://tinyurl.com/mjerja3 <http://tinyurl.com/mjerja3>>  "*TI Circuit
Design for Audio, AM/FM and TV"

http://www.introni.it/pdf/GE%20-%20Transistor%20Manual%201964.pdf  “GE –
Transistor Manual”


Online URL Materials:

<http://ecee.colorado.edu/~bart/book/contents.htm>
<http://ecee.colorado.edu/%7Ebart/book/contents.htm>



=====
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--
Dar W9HZC

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