BOM and Schematics for Rev B.8

[NZ0I]

Actual orderable parts are now associated with all the components in the new schematic Rev B.8 now on the google share drive.

Rev B.8 also removes the digital step attenuator, and adds circuitry to adjust the gain at the SA605. Some component values are still likely to change, but this should be very close to the design that will be supported in the next board spin. Rev B.8 also includes a replacement for the I2C potentiometer that DK decided to no longer stock, and a few other needed changes that became obvious while creating the BOM.

The BOM document has been revised for all the Rev B.8 parts. We still don't know the cost of the PCBs, and certain hardware components, like a 3D-printed chassis, panel-mounted switches, and a few other items. The costs below exclude those unknown parts, and also assume single-unit prices from DigiKey and Amidon. These prices do include all the optional "extras" like RTC, LiPo and switching supply, RF detector, AdaFruit digital compass, etc.

Receiver Board: $93.32

Digital Interface Board: $29.61

Control Head: $85.39

80m Antenna: $8.37

I'll let things ferment for a little while and then start laying out the first PCB. There will no doubt be several more Rev B schematic revisions as new things are discovered.

One concern: DigiKey shows zero stock of our 2x20 LCD display, with back-order wait time until early March. But at least they are not discontinued.