CPU fan stopping alarm circuit diagram

Published:2011/6/24 4:17:00 Author:Ecco | Keyword: CPU , fan , stopping alarm | From:SeekIC

D1 and D2 are respectively the infrared transmitter and infrared receiver tubes, and they are against the installation and 1.2-1.8 cm apart. When it gets power, D1 emits a continuous infrared beam IR, which is intermittently hitting the receiver tube under the block of blade from time to time. This, V1 will have a pulse type of bias current to make the two ends of R2 generate pulse voltage. D4 must use a germanium diode such as 1N60, 2AP9 and so on. SPEAKER can select the type on the quartz clock with pointer.



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