Understanding the NAND Gate Oscillator - Touch Switch - Electronic Circuits for the Evil Genius
 
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Lesson 25
Animated Figure L25 - 1
RC Discharge Over Time
Note this is an input.  When charge drops below half of V+, it is sensed as "low."
The action of an RC Circuit is always the same. 
  Fill & Drain . . . 
  Fill & Drain . . . 
Animated Version of 
Figure L25 - 2
Oscillation created by feedback loop
The input at Pin 1 is slaved to the output of Pin 3. 
Animated version of 
Table L25 - 3
At Rest = Stable Output
The system is at rest. The processor is not doing anything.
Animated Version of 
Figure L25 - 4
RC 1 input at pin 2 determines if RC 2 is oscillating
The system is ACTIVE as long as C1 is providing an input seen as Hi.
Animated Version of 
Table L25 - 4
Oscillating Active System
A Hi Input to Pin 2 creates the oscillation.
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