[Elecraft] Feature request - Disable Break In on K3

[Ron D'Eau Claire]

Ralph, I was raised with vacuum tubes. My first receiver used three type 76
triodes. In school I learned to design with tubes, plot their
characteristics and so forth. I homebrewed a lot of transmitters and
receivers using vacuum tubes as  Ham and I serviced a lot of vacuum tube
gear in my work. 

And then after just a couple of years working as an Technical writer (all
engineering in those pre-computer days) I found myself looking at schematics
of transistors. 

Now, by then, I had read many books on transistors - all about holes and
carriers (in junction devices) - but they still confused me. So, one day, I
bought several devices, dug some pots out of my junk box along with a few
batteries for power and started bread-boarding transistor circuits. It was
only a few hours before the "AHA!" moment that had me watching how the
collector or drain current varied with the base current or gate voltages. 

That was about 1960 and I was hooked on solid state. That was before
integrated circuits. Oh, there was some TTL around, but most of the stuff I
wrote circuit descriptions for were things like J-K flip-flops made out of
junction transistors. 

I still mess with tubes occasionally. I love watching the filaments come up
to temperature and the smell of hot glass. But solid state is something that
can be bread-boarded in minutes with no need to wire filaments. Many of my
breadboards are no board at all, just a big ball of components wired
together in a sort of "rat's nest" of components. That works great for low
frequency and audio stuff. 

As long as you are breathing you are young enough to learn and enjoy new
things. Give it a shot! You might discover a world of fun! 

73, Ron AC7AC

-----Original Message-----


On Aug 29, 2013, at 4:15 PM, Ralph Parker wrote:

>> If you use Joe's solution where PTT is one input into an AND gate, if 
>> PTT is not asserted, your relays will not close. All inputs to the 
>> AND gate must be present for the output to change state.
> 
> I've wanted this 'feature request' since K3 Day 1.
> Don's solution sounds like a reasonable work-around.
> Unfortunately, I'm transistorially challenged.
> Can I build this with a few 12AU7s ?
> 
> Ralph, VE7XF