FLIP FLOP and MEMORY CELL Circuit
When output
pin 3 is HIGH, the 220n charges through the 220k to 6v. When pin 3
is LOW, the 220n discharges through the 220k to 0v. Pressing the
switch upsets the 3v created by the two 10k voltage dividers,
triggering the flip flop inside the 555 and changing the state of
the output from HIGH to LOW or
vice-versa. The output of the
555 drives a transistor to turn a globe on and off.
The second circuit is a Memory cell and is the basis of the memory
in a computer. The SET button turns on the globe and the RESET
button turns the globe off.
It works like this: When the circuit is turned on, pin 6 does not
see a high and pin 2 does not see a low, so the 555 starts in reset
mode.
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