I recently built 2 each of the Clock VCO (RevD) and D Flip-Flops (RevC) that I bought PCBs for direct from LZX. I ran into a couple of behaviors that I thought I should document/ask about.
Building the clock VCOs I got a little confused with the switches. The BOM says that S1 is the on-on switch, which makes sense for the range switch and I can confirm with a multimeter that pin 6 of the 74HC4046 is connected to the center pin for S1. However the panel says that S1, the switch further from the knobs, is the sync switch. So the switch placement is correct on the PCB and both modules work fine, but I was thrown for a loop for a bit.
For the D Flip-Flops, I was getting no output from either module but eventually figured out with my oscilloscope that the chip’s active-low reset pin was being held low with nothing patched to RST. The jack seems to be normalling to 5V as indicated in the schematic, and when I patch 0V to the RST input the modules operate but with 5V patched (or I reckon just > 0.5V, haven’t measured precisely where it switches) there’s no output. Not sure if maybe the easiest thing to do is disconnect pin 2A on J5 to let R9 pull the comparator input to ground with nothing patched?
My other Castle/Cadet builds have gone pretty much without a hitch. I’m having a little trouble getting the Cadet I to genlock to my Vidiot, but if I use a passive splitter so the Cadet II output can go to the display and the Vidiot’s camera input, I’ve got everything synced and have been having too much fun patching to investigate that yet.