This project contains a home-made symbol, a home-made subcircuit counter model, and a mix of digital and analog nodes.
Before running the project, please edit file state-machine-3b-count.lib: In line 13 you will need to enter the absolute path of file state-3bit-count.in: This need will be removed in a future KiCad version.
The subcircuit counter model is made by the built-in ngspice/XSPICE state machine. This is a very simple method to run a programmable sequencer. The 'program' is contained in file state-3bit-count.in.
Please see chapter 12.4.18 'State Machine' of the ngspice manual for more information.
The digital nodes of the state machine are interfaced to the analog world by D/A bridges.
When plotting the output, we use User-defined signals to allow plotting of multiple signal vertically without overlap, thus emulating multiple panes.
