The versatile cd4093b schmitt nand ic 2013-01-17

Schmitt logic gates such as in the CD4093 quad NAND gate IC are useful buiding blocks for various functions. The example functions shown here are oscillator, bistable, RS latch and monostable. I don't claim any originality for these, but thought it useful to bring them together for the benefit of newbies.
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The oscillator in circuit A is simple in the extreme but works reliably (albeit subject to slight frequency drift with temperature and supply voltage)...

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