555 Timer Lab
NE555 · astable oscillator
555 Timer Lab
Power on
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Circuit
Charging through R1 + R2
DSO · 2 CH
CH1 pin 3 · 5 V/div
CH2 capacitor · 2 V/div
200 ms/div
ROLL
Time/div
◀
200 ms
▶
Auto
CH1
CH2
Run
Inside the 555
Live logic states · orange = HIGH
Output LED
LOW
Flash rate
Flashes counted
0
Measured
–
Reset count
Speaker off
Hear the output as a tone
Press trigger (pin 2)
Last pulse measured
–
Spacebar also triggers
Components
Type values like 4k7, 47k, 100n, 10u
Supply
V
cc
on pins 8 and 4
Presets
Standard E-series values
Calculations
Grey boxes are hidden — tap one to reveal
Astable
oscillator · flashing LED
Monostable
one-shot timer