Comment by K5ARN: Sorry about the pun above! Walt you have done a great job with this kit project. You were just handed the project from somebody else, you anticipate it was a working kit project, which is was not, I admire you taking care of the problems and staying with it. Many Thanks Walt!
Greetings ‘KIT’ Group;
We had 6 present for our “KIT” workday yesterday.
NOTICE TO BUILDERS NOT PRESENT YESTERDAY: Your kit case end covers are
on the front table in the club house meeting room. They are wrapped in
blue tape labeled with your call. Note that the attachment screws are
very small and are under the tape. Use care to prevent loss when you
unwrap them. I have included one extra in case one does go missing. I
sized and located the holes on the rear panel to fit my prototype.
Yours should be close, but might need slight additional filing for best
fit and clearance for the DIN plug. If you have not yet received the
extra transistor and resistor needed for the engineering change please
contact me. I did not make a list of who received them.
Note also: The wiring side pictorial diagram caused some (MUCH!?)
confusion yesterday, PLUS I found that I made an error trying to show
the connection of the additional resistor. I have attached an updated
copy the diagram and I will attempt to provide some explanation here.
The additional transistor installs in row 17, columns G (E), H(B), and
I(C). The collector of the added transistor connects to the collector of
the original transistor. The base of the added transistor is fed by the
2.2K resistor that previously fed the base of the original transistor.
The emitter of the added transistor connects to the base of the original
transistor. The added 12K resistor connects from this emitter-base
connection to ground. There is very little space near these transistors
for the 12K resistor. As I now have it shown it appears to require the
resistor wire to go thru the same hole in the board (G-17) as the
emitter of the added transistor and while that is a correct connection
it may not be convenient or possible! The way I have it routed on my
board is thus: The ground side of the resistor is thru hole E-16 to the
ground buss. I bent the ground buss wire to the side and the other end
of the resistor goes thru hole F-17 to connect to the transistors. This
is also not ideal but will work without a short IF YOU ARE CAREFUL!
(The error that I had on the previous version of the diagram was that it
showed the resistor connected the the base of the wrong transistor.)
I’m sorry to have caused y’all this additional confusion to an already
confusing enough situation! In my view the schematic is a better guide
for the connections and the pictorial is just an aid for the layout of
the parts. I realize that schematics are difficult for some of y’all,
but you are learning! Try looking at the actual parts connected on the
board and find / follow them on the schematic. This should help you to
relate the actual components and the connections to the symbols on the
schematic and to the circuit.
If you are still confused please contact me. I’ll be glad to try to
help! We can arrange additional work sessions if needed. If you damage
or loose a part I do have some spares.