555-556 Timer info

555 Astable Operation

t1=0,693 * (R1+R2). C1

t1=0,693 * (R2). C1
Frequency=1,44 / ((R1+2R2).C1 )



for the circuit trigger itself each timing cycle, the 2nd  and 6th pins are connected, there by functioning as an oscillator.



C1 Discharges Through R2 and charges through R1 and R2.
The-Charge on C1 Ranges from 1/3 Vcc to 2/3 Vcc.




T he Oscillation frequency is independent of Vcc.

Keywords : 555, 556, Timers, Multivibrators, Astable, Bistable, Monostable
Writer : delon  |
16 Mar 2006 Thr   
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