The Walsh Experimenter's board is meant to be a platform for making use of the Walsh chip without having to mess with soldering that pesky PLCC socket. The circuit consists of a Walsh chip (of course), a clock conditioner, a patch area of sorts, and a mixer circuit. The mixer circuit comes courtesy of Scott Gravenhorst who generously granted permission for the blatant stealage.
Sadly, the first cut of the board didn't work. The clock conditioner's output edges were too slow for the CPLD to use. Also some of the hole sizes are on the edge of being to small and need burnishing before the components can be placed. So I have a stack of circuit boards that are up for grabs if anyone wants to hassle with them. They will work fine if you feed a nice sharp TTL signal to the clock input.
Here are the files for the 1st boards:
PDF - Parts Placement, Version 1
So now comes version 2. A better clock circuit is in the works. Basically it is a zero-crossing detector followed by a schmitt trigger buffer. Here is the schematic for version 2:
As soon as the new clock circuit is confirmed a run of boards will be make, and with luck they will work. I am planning on offering boards and kits at cost.
Stay tuned for more news!