ic 555 timer projects cbt
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The 555 timer is one of the most remarkable integrated circuits ever developed. It comes in a single or dual package and even low power cmos versions exist - ICM7555.
Common part numbers are LM555, NE555, LM556, NE556. The 555 timer consists of two voltage comparators, a bi-stable flip flop, a discharge transistor, and a resistor divider network.
dual package
LM555
NE555
LM556
bi-stable flip flop
pin 6
2/3
pin 2)
1/3
op-amps
Reset
connects pin 7
precision timing
pulse generation
sequential timing
pulse width modulation
Ground (Pin 1)
Trigger (Pin 2)
Output (Pin 3)
Isource up to 200mA
Reset (Pin 4)
Output high is about 1.7V
Control (Pin 5)
Allows access to the 2/3V+ voltage
Threshold (Pin 6)
Discharge (Pin 7)
operates 3V - 16V DC
resistor-capacitor
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