work by uploader |Date=2011-Jun-15 |Author=Quincyplus |Permission={{PD-user|Quincylus|zh}} |other_versions=LEDx4Circuit.PNG，LEDCircuit.PNG }} English...
|Author=Quincyplus |Permission={{PD-user|Quincylus|zh}} |other_versions=LEDx2Circuit.PNG，LEDCircuit.PNG }} English determination method or standard: SHA-1...
