The timing ventilation circuit of 555 auto temperature control

Published:2011/5/27 20:32:00 Author:Borg | Keyword: ventilation circuit, auto temperature control | From:SeekIC

The temperature control ventilation circuit consists of step-down rectifier circuit, long period multi-resonate oscillator, photocoupler and controllable silicon control circuit, etc, which is simple and stable. The circuit can be used to ventilate and cool poultry houses, animal shelters and warm houses,etc. The circuit is as shown in Figure 12-37. The rectifier circuit consists of step-down transformer T, full bridge rectifier QU and C1, etc, the rectified voltage of about 14V is stabilized by the 3-terminal voltage stabilizer LM7809, and it reduces to be a +9V voltage as the working voltage of the backward-stage circuit.



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