say... was that transistor a Raytheon CK722 or a CK721???

Bob Landman


----- Original Message -----
From: Scott Decker <[log in to unmask]>
To: <[log in to unmask]>
Sent: January 11, 2000 10:56 AM
Subject: Re: [DC] AW: [DC] Reference Designators


Boy you guys do remember the good old days when a tube would fix 80%
of the
radios and TVs of the day. I will have to say that I too had a crystal
radio
that had the toilet paper tube coil. At the tender age of about 6 or
7, I
lost the crystal. BUT, not to fear, I remember reading in my "All
About
Books" about those new things called transistors. They were made of
the same
stuff that the crystal was... Soooo, I made my first transistor radio.
Depending on how I configured the E-B-C leads across the place where
the
crystal went, got me different stations. Yes, the good old days...
Boy the trip down memory lane... Just glad I didn't make a wrong
turn...

        Regards,
        Scott Decker

        AKA: PadMasterson
        Mentor Design Supervisor, Portland
        7245 NW Evergreen Pkwy., Suite 100, Hillsboro OR 97124
        (503)531-2050 ext. 1820 FAX: (503)531-2051
        [log in to unmask] <mailto:[log in to unmask]>
<mailto:[log in to unmask] <mailto:[log in to unmask]> >
         Tyco Design
        Formerly Praegitzer Design, The Fine Line in Printed Circuits



        -----Original Message-----
        From:   Wanner Bernhard [SMTP:[log in to unmask]]
        Sent:   Tuesday, January 11, 2000 12:36 AM
        To:     [log in to unmask]
        Subject:        [DC] AW: [DC] Reference Designators

        ... good, old time!

        -----Ursprüngliche Nachricht-----
        Von:    Bob Landman [SMTP:[log in to unmask]]
        Gesendet am:    Montag, 10. Januar 2000 21:29
        An:     [log in to unmask]
        Betreff:        Re: [DC] Reference Designators

        Yes, and the crystal was the rock crystal called galena
(orginally
but
        later germanium and then silicon the first hermetic diodes
used a
cat
        whisker point contact that emulated the old crystal radio
sets.  I
        recall building a Phillmore Jr. way back when and winding my
own
coil
        too.  Reception was pretty darn good (AM stations really pump
pump
        ouit the power).

        These days, we use the "D" designation instead.  yes, K stands
for
        coil, more specifically a relay coil.  K on a diode is of
course the

        Kathode (though why it is spelled that way eludes me - maybe
it's a
        German derivation as in Kathode Ray tube but then the Germans
call
        CRTs Braun tubes for the scientist who invented them).

        Bob Landman