In this mode the 555 is used as an oscillator. The oscillator frequency and mark / space ratio is set using one capacitor and two resistors. The reset pin may be used to stop the oscillator.
The oscillator frequency is given by :
f = 1.44/((R1 + 2R2)C)
The time period is given by : Output High th [...]
As shown in the schematic diagram here, the astable multivibrator simply extends the modification that converted the bistable multivibrator to a monostable version of the circuit. Now, both transistors are coupled to each other through capacitors…
Source : Astable Multivibrator
Astable Multivibrator by IC LM3900
For oscillator-generator and LED Display.
Source : Astable Multivibrator by IC LM3900
Other Link of lm3900, Running Lights
Function Generator by IC LM3900
Nite Rider Lights by IC 4017, 555
Running Lights by LM555 + 4017
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