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BackCounter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many external clock sources cycle between 0v and 5v max // gate out (j4/j10 // clock out (j5/j12) // glide atten (rv15 // 13 SPDT switches 1 rotary switch, 5+ positions - 10 ohms between U1-14 and U2-1 when off, more like 1M ohms when off Single Step - 12V through 10k Ohms to U-1-14, more like 1M ohms when off - Single Step - 12V through 10k Ohms to U-1-14, more like 1M when off.
- Grid, 17x17mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=93.
- Type055_RT01502HDWU pitch 5mm size 25x7.6mm^2 drill 1.3mm.
- { "spice_external_command": "spice \"%I\"", More tweaks.