Subj : 555 - love the comments!
To   : Barry Martin
From : Ed Vance
Date : Sun Dec 15 2024 18:31:41



> Hi Ed!

> Yes: '555' to also immediately reminds me of the very popular timer IC 
> -- probably built in to other ICs now rather than as a separate chip.  I
> probably have a few in in my Electronics Workbench area in the basement.
> Used to do a lot of building and repair.

> Here's another memory-invoking part: 2N2222!

>                      >                                 <
>                       >  BarryMartin3@MyMetronet.NET  <
>                      >                                 <

> ... 1 million microphones = 1 megaphone
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I used many 2N2222's.

I was in High School when Xsistors showed up in the wholesale electronics store
and went there to buy a 2N107 (IIRC) for $1.00 USD.
The next morning I showed it to my classmates and one of them said he would
like to have one of those for a project he seen.
So I let him have it for the price I paid for it .

It was many years after that for me to buy another Xsistors.
Back then I had just learned about rectifier tube circuits for a Full Wave
power supply.

The AM Radio/3 speed Record Player I had was a "hot box" with a 35W4 rectifier,
a 50C5 and one or two other Tubes in it .
Years later I used that for the amplifier for a home intercom by running 2
wires from where the Phono Cartridge cable was connected and put a Jack for
Banana Plugs on the end of each of those two wires.

My intercom had a 4 Ohm speaker, a 4 Ohm/10,000 Ohm transformer and a DPDT
switch with wires going to Banana Plugs to go in to the Jacks I attached to my
combo Radio/Phono.
Oh!, forgot to mention the Rotary Switch to select which room I wanted to talk
to.

I had one speaker mounted high over the front door and a couple other speakers
in rooms.

Later I put a AC-DC amp a buddy had in his junk pile and put it inside the
wooden intercom box so I didn't need to use the Radio/Phono Combo with it
anymore.
Ed
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