The 555 natural wind circuit of long timing

Published:2011/5/29 22:33:00 Author:Borg | Keyword: natural wind, long timing | From:SeekIC

Figure 12-12 the natural wind circuit of long timingIC1(555),RP1,R1,R2 and C consist a non-steady multi-resonate oscillator whose f is 1.44/(RP1+R1+2R2)C, and the frequency can be changed by changing the measuring range of C and adjusting RP1, the frequencies of the output pulse square waves are 0.25Hz,0.5Hz and 1Hz, respectively, which can be the counting clock of IC2. The circuit computes with a 12-degree binary series counter/frequency distributor. When it is on, press the reset switch AN and clean the former numbers, then it starts to count, Q1,Q2,Q3 and Q4 deliver counting pulse to IC3 in turn. IC3 is a 4 bit lock/4-16 wire decoder CD4514.



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