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The modifications &
upgrades made to the Ultimate 2b
board:
(Ult-2 to the Ult-2b)
R-Tune
was
added so using a *100
ohm pot in series with R4 could fluctuate the transistors junction
voltage which changes the junction capacitance slightly. This
allows fine tuning the pitch from a remote location.
C13 .1uf is not shown on the above schematic but is on the
board, it was added to keep the R-Tune
cable at AC ground. L2 is still
used for the main tuning. You must
cut the
R-Tune pads apart if a pot
is used, do this by scratching with a razor blade between the pads
after the project is complete and working properly. Flopping
around pots just get in the way.
* Note:
A different pot value may be necessary if more or less response
is needed, I do not
use R-Tune.
The battery connection and switch pads were moved to the left
side of the board.
Added the "Lev Antenna" connection L1-A3
to the circuit board and changed the
coil to a antenna center tap "CT"
connection.
R4 & R5 were changed from 15K to 10K a more available Radio
Shack value.
The two LED mounting positions were rotated 90 degrees so they could
be folded down parallel to the board.
D1 was moved to the right so another L2 coil mounting screw
hole was available
D1 & D2 should also be 1N4001 diodes which are sturdier.
C15
below Pot 1 was added. I am using a 10 uf
capacitor
which works excellent after testing the circuit. Pot1 needed to reduce the gain
at this stage more effectively. 02.21.05
Three pc board terminal pads (R-tune, To
Ult-5 & Audio Out) are added for easier wire
connections to the board. RS
#276-1388 The antenna and battery connections are also
spaced to use these terminals posts.
A direct line out to drive the Ultermen 5 board was
added. This way you can keep the Audio-Out at a microphone level
if needed. A frequency counter or pitch monitor can hook up from
the To Ult-5 output.
Every component has its value next to it on the circuit board
silkscreen, I think?
The original extra right side antenna connection was unnecessary and removed
from the board.
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