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The reminder circuit of opening door too long of 555 fridge

2015-02-04 19:50  
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The reminder circuit of opening door too long of 555 fridge
The reminder circuit is shown in Figure 13-23. It is a 555 timing circuit which fulfills two functions of time delay and oscillation, and it is simple and useful. With the use of 4-lead reset terminal linking to the ground connection capacitor C4, and the switching of relay connector K1-1, it can fulfill the function of time delay. Figure 13-23 The reminder circuit of opening door too long of fridges 555,R2,R3 and C4 consist an audio oscillator which delays time for 15s. SA in the figure is the door control(light) switch of the former fridge. When the fridge door is open, SA will automatically close and the control circuit will get the power.