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BackOne, but many external clock sources cycle between 0v and 5v or even much less. - One SPDT switch to set output voltages. (10) One potentiometer for internal clock rate. One SPDT switch to disable reset (run once). Momentary-normal-off pushbutton to manually reset. More repo cleanup, adopt github .gitignore file # Temporary files *.000 *.bak *.bck *.kicad_pcb-bak *.kicad_sch-bak Initial kicad, images, gitignore for kicad backups Initial kicad, images, gitignore for kicad backups .gitignore | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>