Subj : 555 - love the comments!
To   : Ed Vance
From : Barry Martin
Date : Mon Dec 16 2024 07:34:00


Hi Ed!

 EV> I used many 2N2222's.

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


 EV> It was many years after that for me to buy another Xsistors.
 EV> Back then I had just learned about rectifier tube circuits for a
 EV> Full Wave
 EV> power supply.
 
Back then I built more with solid state -- I guess more because of the 
mechanical as didn't have to bore out holes for tube mounts -- easy to
drill a small hole to mount a terminal strip or PC board.  Repairs were
more tube-based as that's what needed repairing.



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

That reminded me: Dad had a home-office combination so an intercom at 
the office door and the kitchen.  Could hear street noise when the 
volume was at talk level so turned down, but then of course had to 
remember to turn back up to communicate.  Dad came up with the idea to 
use a mercury switch as an on-off switch: upright to talk, lay sidewards
to shut off.  No need to touch the volume!  (The intercom button by the 
door went to a buzzer inside the house doorbell.))

                     ¯                                 ®
                      ¯  BarryMartin3@MyMetronet.NET  ®
                     ¯                                 ®


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