| https://www.ikalogic.com/ |  | Ikalogic - Logic analyzers and portable oscilloscopes | 
          
                                                                                        | https://www.the12volt.com/resistors/resistors.asp#calc |  | Resistor Colors and Calculator | 
          
                                                                                        | https://ledcalculator.net/ |  | LED Calculator - Current limiting resistor calculator for LED arrays | 
          
                                                                                        | https://ccrma.stanford.edu/ |  | Center for Computer Research in Music and Acoustics | CCRMA | 
          
                                                                                        | https://itp.nyu.edu/physcomp/lessons/ |  | Lessons – ITP Physical Computing | 
          
                                                                                        | https://electronicsclub.info/ |  | Electronics Club | 
          
                                                                                        | http://dpfwiw.com/ir.htm |  | Infrared (IR) basics for digital photographers—capturing the unseen | DPFWIW | 
          
                                                                                        | https://hpi.de/baudisch/projects/multitoe.html |  | Multitoe | 
          
                                                                                        | https://hpi.de/baudisch/home.html |  | Hasso Plattner Institut HCI Lab | 
          
                                                                                        | https://www.thorlabs.com/thorProduct.cfm?partNumber=FB980-10 |  | Thorlabs - FB980-10 Ø1" Bandpass Filter, CWL = 980 ± 2 nm, FWHM = 10 ± 2 nm |