Reset_timer_astable_operation

Published:2009/7/24 23:48:00 Author:Jessie | From:SeekIC

This circuit shows how a CA555 timer can be connected for astable (free-running) operation. Figure 3-13B shows typical waveforms. Figure 3-14C shows free-running frequency versus Rc for various values of R1 + R2 and CT.Notice that the total period is a function of both R1 and R2 as shown by T= 0.693 (R1 +R2)T C and t2= 0.6983 (R2)CT The duty cycle is t2/(t1+t2)= R2/(R1+ 2R2).



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