Here's the datasheet with schematic: http://www.ti.com/lit/ds/symlink/lm393.pdf http://www.ti.com/lit/ds/symlink/lm393.pdf Ah, the days when 9 transistors coul

Here's the datasheet with schematic: http://www.ti.com/lit/ds/symlink/lm393.pdf http://www.ti.com/lit/ds/symlink/lm393.pdf Ah, the days when 9 transistors could change the world.