555 safe and reliable intermittent electric heating control circuit

Published:2011/5/30 18:41:00 Author:TaoXi | Keyword: 555, safe, reliable, intermittent, electric heating, control circuit | From:SeekIC

This heating circuit uses the light/electric type solid-state relay and it is composed of the step-down rectifier circuit, the duty ratio adjustable multivibrator and the solid-state relay, as the figure 15-39 shows. The step-down rectifier circuit is composed of the buck capacitor C5, the full bridge rectifier QD and the filter capacitor C4, and it is stabilized by the three ports stabilizer IC2(7809), then it outputs the voltage of +9V to supply power to the control circuit. The heating circuit uses the time base circuit 555 as the core, the duty ratio adjustable low-frequency multivibrator is composed of the 555 and R1，R2，RP1，D1，D2, the oscillation period is the fixed value, but the duty ratio can be adjusted by RP1.



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