SoftRock Lite II circuit board
- Good Evening All,
The circuit board for the SoftRock Lite II kit is through the layout
phase and will be checked this weekend. Circuit boards will go on
order Monday, December 22. The board may be seen in the files area
in the new SoftRock Lite II docs folder. I will get the Lite II
schematic posted later this weekend.
The Lite II circuit board size is 2.5 inches by 0.9 inches. All SMT
components are mounted on the bottom of the board and I think overall
the board will be easier to build than the earlier SoftRock Lite kit.
Since the Lite II is intended as a low cost SDR receiver sampler the
circuit has been simplified from the earlier SoftRock Lite. Changes
include synchronous clocking of the QSD by a single 74AC74. This
results in only a division of four from all crystal oscillator
frequencies. One hundred ohm resistors are included on the board in
each audio output output to the soundcard line-in to help prevent
some op-amp failures experienced with the earlier SoftRock Lite kits.
Kits to be offered in early January will include a 160m kit, an 80m
kit, and a 40m kit where each kit price will be the usual $10 for
US/Canada and $11 for DX with mailing costs included in each kit
price. Other kits to be offered will include an upgraded 30m kit, an
upgraded 20m kit and an upgraded 15m kit. Each of the upgraded kits
will be $12 for US/Canada and $13 for DX with postage cost included
in each kit price. The upgraded kits will all make use of 1/3 sub-
harmonic sampling but will have an LT6231 op-amp in the audio stage.
Thanks for the many positive comments concerning the value of the
SoftRock Lite as a low cost mean of letting people sample SDR.
Thanks and 73,