Photosensitive tracking control circuit

Published:2011/9/6 1:42:00 Author:TaoXi | Keyword: Photosensitive tracking, control circuit | From:SeekIC

The atmospheric pressure regulating equipments always use the tracking control circuit which is composed of the photosensitive battery BPY11. When both of the two photosensitive batteries are irradiated by the light, there is no base current in the input transistor, they are similar to two phototransistors which are in the cut-off state, the electric motor has no current. If a photosensitive cell is not irradiated by the light, the corresponding edge half-amplifier will conduct, the electric motor turns left or right. The last stage diode group can be used to protect the transistor to prevent the damage. The photosensitive signal can be adjusted by the 10MΩ potentiometer.



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