The integrated controller circuit of 555

Published:2011/5/28 21:59:00 Author:Borg | Keyword: integrated controller | From:SeekIC

See as Figure 12-22, the controller can fulfill stepless timing and stepless speed adjusting, which can not only control fans, but also control heaters and motors, and its timing span is long and precision is high. This circuit includes the speed adjuster, timer, interval switch, chief switch and power supply,etc. Figure 12-22 The integrated controller circuit The step down circuit provides a DC voltage of +12v for the controller. IC1, VT1~VT2 and so on consist the speed adjuster control circuit, while 555,R3,R4 and C3 consist the controllable multi-resonate oscillator, the oscillating period is T=0.693(R3+R4+RP1)C3.



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