Here is the stack with 3x8 signal hedgehog board and prototype mezzanine board.
Signal hedgehog board only.
Close-ups of hedgehog board (top view) showing layout details.
Close-up of hedgehog board on end-plugs. Note that the ground pin nuts and gas jumpers are missing from our model
Top view of prototype mezzanine card.
This differs substantially from the final design and is shown to illustrate size only.
The gold-colored daughtercard holds a prototype ASDLite chip for testing. The module-zero version now under development will have (6) four-channel ASDLite chips (in standard plastic IC packages) and one AMT-0 TDC.
Side view showing the board stack.