vactrol.md

@@ -41,7 +41,7 @@ Within the series the different types differ strongly in range though:
 This has to be choosen depending on the application. For most audio stuff GL5516 and GL5528 should be fine.
 
 ### LED
-Because the whole GL55 Serias has it's spectral peak at 540nm (green) and the LDRs have a diameter of 5mm it would be advisible to use 5mm green LEDs. Because ultimately LDR and LED could (and maybe should) be epoxied together, it would be ideal to have a cylindrical LED (with a flat top) rather than the typical round ones. One could still probably use standard ones and sand them down so they are flat.  
+Because the whole GL55 Serias has its spectral peak at 540nm (green) and the LDRs have a diameter of 5mm it would be advisible to use 5mm green LEDs. Because ultimately LDR and LED could (and maybe should) be epoxied together, it would be ideal to have a cylindrical LED (with a flat top) rather than the typical round ones. One could still probably use standard ones and sand them down so they are flat.  
 
 The cylindrical 5mm green LEDs I found were Kingbright WP483GDT which cost ~0.30 Euros per piece or unlabeled ones for 0.026 Euros per piece ([pack of 1000 at amazon](https://www.amazon.de/wholesaleled-Flat-Pins-hellgr%C3%BCn-1000-St%C3%BCck/dp/B01G8OIX64/ref=sr_1_1?ie=UTF8&qid=1508150244&sr=8-1&keywords=5mm+LED+green+flat))