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LOW FREQUENCY OSCILLATORS Circuit

2016-08-27 06:37  
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LOW FREQUENCY OSCILLATORS Circuit


If the capacitor is replaced with an electrolytic, the frequency of oscillation will reduce. When the frequency is less than 1Hz, the oscillator circuit is called a timer or "delay circuit." The 555 will produce delays as long as 30 minutes but with long delays, the timing is not accurate.



555 Delay Times:
CR1 = 100k
R2 = 100k
R1 = 470k
R2 = 470k
R1 = 1M
R2 = 1M
10?2.2sec10sec22sec
100?22sec100sec220sec
470?100sec500sec1000secThe following circuits show a 1-5 minute timer and 10 minute timer:


















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