Usually includes the following main parts:
1. Optical system: usually includes lenses, filters and infrared receivers, etc., for focusing and filtering infrared signals. 2. Infrared receiver: pyroelectric sensors are usually used, which can convert infrared radiation into electrical signals. 3. Preamplifier: used to amplify and process the weak signal output by the infrared receiver.
4. Filter: used to filter noise and improve signal stability.
5. Output circuit: output the processed signal to the external device. In addition, some advanced infrared receivers may also include other functions, such as temperature compensation, noise reduction processing, automatic gain control, etc.
The general infrared receiving head has three pins, which are: VCC power supply positive, GND power supply negative, and OUT output.
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The package generally has iron shield and epoxy resin plastic sealing package, but the shape is various, there are patch type, plug-in type, nose bridge type, straw hat type, cylinder type, half ball type, etc., different manufacturers of receiving head pin sequence and shell shape is different.