555 fish tank water temperature automatic heating control circuit

Published:2011/6/7 8:10:00 Author:TaoXi | Keyword: 555, fish tank, water temperature, automatic, heating control | From:SeekIC

This fish tank water temperature automatic heating control circuit is composed of the step-down rectifier circuit, the humidity control timing circuit and the silicon-controlled rectifier control circuit. When the fish tank water temperature is lower than 25℃, the circuit automaticly heats for 10 seconds to keep the water temperature in the range of +25℃ to +30℃. The circuit is as shown in figure 15-49. The step-down rectifier circuit is composed of the step-down transformer T, the rectifier diodes D1 and D2, and the voltage-stabilizing circuit which is composed of the R4 and DW outputs the +9V voltage. The temperature control monostable timing circuit is composed of the IC1(555) and RP1, RT, R1, R2, C1. RT is the temperature sensitive component, it uses the negative temperature coefficient (NTC) glass sealing thermistor, the 555 works in the monostable mode.



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